The classification and characteristics of the development stages of TBM in coal mine rock roadways in China have been analyzed; The application characteristics of TBM in coal mine rock roadways from 2015 to 2024 were summarized, including the main application provinces, rock roadway types, cutterhead diameters, and production groups; The current status of TBM excavation technology in coal mine rock roadways was analyzed from three aspects: advanced detection and prediction technology, adaptability technology to geological conditions in mine production, and stability control technology for roadway surrounding rock. Finally, prospects for future research on coal mine TBM were proposed from three aspects: stability control of deep rock roadway surrounding rock, advanced detection and excavation parameters, equipments adaptability, and rapid assembly technology. This has certain reference value for the design and application of coal mine TBM.

Recently, with the introduction of relevant policies and the digital transformation of traditional industries, the pace of intelligent mine construction in China has accelerated significantly. Due to its specificity, intelligent flotation is a difficult point in mineral processing intelligence. This paper classified the techniques according to the degree of intelligent control, systematically combs through the definition and composition of intelligent flotation system, key sensing technologies, and enumerates some application examples. It is analyzed that the research around intelligent flotation focuses on the development of intelligent perception technology and intelligent decision-making system. The current industrial application shows that intelligent flotation can realize automatic control of relevant operating parameters, stabilize yield and product indexes to some extent. However, the overall construction is still in the primary stage, there is still much room for improvement in the perception accuracy, timeliness, anti-interference, environmental applicability and other aspects of intelligent flotation technology. New high-precision slurry grade (ash) measurement technology needs to be developed. Limited by the precision of intelligent sensing technologies, the relevant industries are expected to flourish in the future.

Drawing upon the design framework of the Shilawusu coal mine, the undertaking confronts a myriad of obstacles, encompassing the excavation of deeply buried coal seams, the intricate coexistence of oil, gas, and coal reserves, the inferior lithological properties and high water content within the Cretaceous strata, arduous wellbore construction, intense ground pressures, the propensity for spontaneous coal seam combustion, as well as substantial ecological and environmental pressures. To overcome these challenges, the project adopts an integrated approach through technological and economic evaluations, optimizing the location of industrial sites and shaft layouts, innovating shaft freezing techniques, refining the selection of the initial mining area, instituting a robust disaster prevention system, and ensuring zero waste discharge. These advanced design concepts and methodologies will transform the Shilawusu mine into a cutting-edge, intelligent, information-driven, environmentally friendly, and inherently safe super-large mine of the modern era.

A geological model classification and step-by-step modeling method is proposed to address the issue of differences between existing mining prediction software calculation models and actual geological conditions, as well as the inability to predict uneven subsidence caused by difference in internal thickness and undulation of mining blocks. The traditional probability integration algorithm and formula are optimized based on the characteristics of differences in coal thickness and dip angle of each mining differential unit underground, with the aim of building a framework first and then interpolating the details. On this basis, a software for predicting mining subsidence was developed, and the Zhaolou Mine 5301 working face was taken as an engineering example to compare it with existing algorithms and optimization algorithms. After analysis, it was shown that the optimized probability integral method prediction algorithm can reflect the uneven subsidence caused by differences in coal thickness and other factors, and the prediction accuracy has been improved.

Abstract: In the context of the "dual carbon" goal, photovoltaic power generation plays an important role. The opencast dump site provides a new scenario for photovoltaic power generation. However, the construction of photovoltaic power stations in high backfill soil dump sites requires overcoming settlement and deformation issues, and the selection of photovoltaic supports and foundations has become a key and difficult point in power station construction. To address the design issues of photovoltaic supports and foundations for high backfill soil dump sites, this article is based on a photovoltaic power generation project in a dump site in Shanxi, analyzing the impact of settlement deformation on photovoltaic supports and foundations, and in combination with requirements in code and site backfill soil conditions, conducting research and analysis on the selection and economy of photovoltaic supports and foundations, providing a solution for the design of photovoltaic supports and foundations for high backfill soil dump sites.

Abstract:In recent years, the number of reinforced concrete silos undertaken has increased, the silo diameter and model have increased, and the reserves have increased, but the construction of the silo roof structure is the difficulty and key link of the silo project. At present, the construction support system of silo roof structure mainly includes central scaffold + fixed-length truss, lattice central column + fixed-length truss, lattice central column + Bailey frame and other support types, the construction methods are diverse, and the silo support system of different diameters is different, which can not be used universally, and the economy is poor. A kind of prefabricated silo roof support platform was designed, which can be suitable for the support system of the construction of various silo type silo roof structures. Through the construction and application of the 1# and 2# product silo group projects in the first bid section of the Jisan Si Hekou Port Coal Storage and Blending Base Project of Yankuang Energy Jisan Coal Mine, it is confirmed that the structure of the support system is simple, and the platform truss meets the needs of the construction of silo roof structures of different diameters by splicing the standard sections into platform trusses of different lengths. The central column adopts a segmented design, with socket butting and bolt connection, and the standard section is spliced into the central column of different heights to meet the needs of the construction of the silo roof structure at different heights. The system adopts the assembly type, which has the characteristics of light total weight, turnover, high safety, fast construction and high economy, and improves the competitive advantage of enterprises in the construction of silo projects.

In response to the problem of large deformation caused by high stress bearing capacity of dynamic pressure roadways under the conditions of the residual coal pillars disturbance and thin spacing rock layers, taking 10102 transportation roadway of Huangjiagou coal mine as the engineering background, a stress transferring model of the floor under the action of residual coal pillars and multi-state thin interlayer rock layers is established. The stress transfer and coal sliding characteristics under different fracturing angles in the target roadways are elaborated, and fracturing parameters based on stress source and transmission path control are determined. The pressure relief of fracturing roof was carried out on site. Research has shown that the influence of residual coal pillars on the floor is mainly vertical stress, and the pressurization forms the 8+9 coal seam floor loading area under the action of degradation bearing capacity of fractured rock mass and the blocking transmission effect of broken expanding rock mass in goaf. It also generates additional stress on the surrounding rock of 10 coal seam mining roadway, determining the sensitivity angle of the stress concentration boundary line. The fracturing weakening of interlayer rock improves the stress environment of the coal pillar below the roof pre-splitting line and reduces the load-bearing of the remaining coal pillar and the transmission degree of mining-induced stress to 10 coal pillar, obtaining the equivalent fracturing weakening width with 7.5 m. The fracturing with 45° pre-splitting angle corresponds to a horizontal fracturing distance of 12.5 m in the interlayer rock, and the vertical stress, deformation, and coal pillar sliding degree of the target roadway surrounding rock reach the minimum. After fracturing with 45° on site, the fracture network is developed and penetrated, effectively achieving pre-splitting and cutting roof. The deformation of the roof to floor and two roadsides decreased by 60.1% and 65.5% respectively compared to conventional conditions, improving the stability of the surrounding rock and ensuring high production and efficiency of the working face.

Aiming at the problem of long-distance roadway tunneling under the extremely close goaf area, the excavation of 1-2 down 205 tailgate in 1-2 coal composite area of Huojitu Coal Mine as the background. Using the combination of numerical calculation, theoretical analysis and engineering practice, the reasonable interburden spacing and support parameter determination under extremely short distance conditions are analyzed. The research shows that: based on FLAC3D numerical simulation, the long-distance roadway layout and support structure under the goaf are simulated and calculated, compared and analyzed the roadway surrounding rock deformation and stress distribution under different coal pillar widths, interburden spacing and support methods. The reasonable roadway stagger distance should be greater than 17m. Considering the safety factor, the roadway stagger distance is determined to be 21m. When the layer spacing is small , the support effect of anchor bolts and cables is poor, the roof is in a state of tensile failure during the excavation, and the roof control is difficult, so a reasonable layer spacing should be greater than 3m. Under the existing support conditions, when the thickness of the top coal is 3.5m, the displacement of the roof and floor of the roadway changes little, and no scaffolding is required. The theoretical calculation shows that the maximum damage depth of the upper layer to the floor is 2.02m, and when the thickness of the coal beam is 3.5m, the support strength check meets the requirements. According to the field engineering application and the actual measurement of the surrounding rock deformation, when the thickness of the top coal is 3.5m, the joint support method of "bolt-bolt-cable-steel beam-shotcrete" is adopted, the displacement of the roof and floor of the roadway changes little, and the maximum sinking of the roof is 20mm, the roof control effect is good, there is no large-scale roof caving or side slab phenomenon in the roadway, which verifies the rationality of the roadway layout and support scheme.

In order to explore the mechanism of floor heave in the roadway of the mining face with reserved bottom coal and the corresponding surrounding rock control technology, a systematic study was conducted on the 402104 track level roadway of Hujiahe Coal Mine using a combination of on-site mine pressure monitoring, theoretical calculation analysis, numerical simulation research, and on-site industrial experiments. The results showed that as the thickness of the reserved bottom coal in the roadway increased, The maximum value and range of vertical upward bending deformation of the beam structure inside the bottom plate have both increased to a certain extent. At the same time, it is more prone to deformation and fracture under higher bending moment forces, resulting in longer block structures and more severe bottom bulges caused by subsequent rotational transport; The increase in the thickness of the reserved bottom coal will lead to a trend of horizontal and vertical displacement of the arch foot position away from the tunnel, while the increase in the cohesion of the reserved bottom coal will cause the horizontal displacement of the arch foot position to be closer to the tunnel, and the vertical displacement to be farther away from the tunnel; As the position of the arch foot gradually moves away from the roadway, the range of plastic deformation and damage to the coal and rock layers inside the floor increases, leading to an increase in the deformation of both sides of the roadway and the floor; By applying bottom angle diagonal anchor cables and anchor rods, the horizontal movement of bottom coal and its shear resistance can be controlled. At the same time, applying bottom plate anchor rods or short anchor cables can control the vertical movement of bottom coal and its strength value. During the on-site industrial test, a surrounding rock control scheme of "high prestressed and strong anchor cables supporting the two sides and bottom corners in a timely manner" was proposed. The overall control effect of the surrounding rock was good, and the maximum bottom heave during the entire tunnel service period did not exceed 0.5 m, and the bottom heave was controlled within a safe range.

In order to address the problems including the damage of the integrity of narrow coal pillar at the drilling field, the high cost of filling mining, the complex construction technology, and the lower strength of cemented backfill on the site, the selection of grouting materials, the grouting technology and the field practice were investigated and the feasibility of adjacent grouting at the caving areas was evaluated based on the background of the drilling field filling of 15202 working face in the Sanyuanfuda Mine. The adjacent grouting of high-water material in caving area of drilling field of 15202 face was put forward. The macroscopic mechanical properties such as the compressive strength, fluidity and setting time of the high-water materials were measured by conducting the laboratory tests. The obtained results indicate that the strength of high-water material after curing of 28 days is up to 6.3MPa, and the slurry flow is 461.5mm, as well as the setting time is around 10 min when the water-solid ratio is 2:1. The high-water material with higher fluidity can fill the drilling field. The early strength and rapid solidification characteristics make it condense in a short time. Field practice has proved that the adjacent grouting technology of the high-water material can provide an effective reference for the design and construction of the grouting reinforcement in the drilling field, and realize the stability and safety for the narrow coal pillar.

In order to reduce effectively ground subsidence and surface cracks in mined-out areas of coal mines, and utilize comprehensively coal gangue and fly ash of coal-fired power plants, this paper took the coal mines and coal-fired power plants in the Qipanjing mining area for example, developed the filling material for coal mine gob made of fly ash and coal gangue in the Qipanjing mining area, and put forward filling technology and implementation process of gob and retaining gateway in fully mechanized mining. The results showed that the large amount of coal gangue and fly ash were in Qipanjing and its surrounding areas, whose composition was conducive to the filling materials. The strength of the filling materials maded of coal gangue and fly ash from Qipanjing was between 8~15 MPa, which could meet different filling requirements, and the comprehensive utilization of coal-based solid waste was more than 80 %. The low-strength filling material used in the goab and the high-strength filling one used in the side of the gateway along the gob could saved the control cost, be conducive to the rapid filling, and realized the full consumption of coal-based solid waste such as fly ash and coal gangue in Qipanjing mining area.

To study the safety and feasibility of up-mining near coal seam, taking the 7 and 8 coal seams of Baizhuang Coal Mine as the research object, by means of theoretical analysis, FLAC 3D numerical simulation, and engineering measurement, The development range of water-conducting fractures in overburden after mining in the lower 8 coal seam and the failure law of underburden rocks in different layers in the fracture zone are studied. The results show that the theoretical analysis and numerical simulation verify that the maximum height of mining caving zone and the average height of overburden fracture zone are less than the spacing of coal seam. According to the field measurement, the caving zone is within 7.3m from the vertical height of 8 coal. The vertical height is 7.3~14.4m and the water permeability is greater than 20 L/min. The vertical height is 14.4~21.2m, and the water permeability is 10~20L/min. The vertical height is 21.2~29.6m, and the water permeability is 5~10 L/min. The vertical height is 29.6m, which is a curved subsidence zone. The two coal seams are 31.6m apart, and the 7 coal seam is outside the 8 coal mining fracture zone, which is less than 5 L/min water leakage in the micro-crack zone, and the 7 coal seam integrity is less damaged. Therefore, it is safe and feasible to adopt upward mining in 7 and 8 coal seams. The research conclusion can provide reference for related up-mining of close coal seam.

In order to explore the overburden failure height of shallow-buried high-strength fully-mechanized mining face in 12407 working face of Huangyuchuan Coal Mine, two ground boreholes before and after mining were set up at the appropriate position above the working face. Based on the borehole data, the key strata and failure height of the overburden rock were theoretically analyzed and measured in situ, and the failure height of the overburden rock was determined by considering the multi-index factors. Through on-site measurement methods such as drilling flushing fluid consumption and downhole TV imaging, the change process of characteristic parameters in the process of pre-mining and post-mining drilling was monitored, and the multi-index comprehensive evaluation of overburden failure height was carried out. The results show that there are two key strata in the overlying strata of 12407 working face, and the fine-grained sand-stone at the buried depth of 88.7m-116.5m is the main key stratum of overlying strata. The development height of the water-conducting fracture zone of the overburden rock in the 12407 working face is about 77 m from the coal seam floor, which is close to the position of the main key stratum of the overburden rock, and the main key stratum has an inhibitory effect on the failure height of the overburden rock. Based on the comprehensive analysis of multiple indexes of overburden failure height, it can be seen that under the superposition of special conditions such as shallow burial, high-intensity mining and thick and hard bed-rock, the applicability of the empirical formula of ' two zones ' to calculate the height of fracture zone in this working face is general, and the development height of water-conducting fracture zone in 12407 work-ing face is comprehensively determined to be 77 m based on the measured value.

In response to the problems of small impact range, low extraction purity, and long treatment time for drilling in thick and hard coal seams, the targeted coal body is physically modified and the fracture network is transformed using the directional long drilling segmented fracturing and permeability enhancement technology along the coal seam. In response to the problems of packer damage and fracturing fluid leakage during the hard coal setting process, based on the understanding of the fracturing characteristics of hard coal and the mechanical parameter characteristics of the packer, an active pressure bearing "pressure ring internal wedge" structure improvement was carried out on its end. The thick and hard coal seam open hole setting combination tool string was selected, and after laboratory pressure testing, the sealing effect was good, meeting the requirements of multiple pressure relief and expansion. We have developed a complete set of equipment for segmented fracturing of thick and hard coal seams, as well as a reverse segmented fracturing process for directional long boreholes. Two directional long boreholes and eight fracturing tests were conducted in the No.3 coal seam of the Daning Mine in Yamei, Shanxi, with a cumulative drilling depth of 975m and a cumulative water injection of 596m3. The results showed that the gas extraction concentration in the experimental area was all above 75%. The actual impact radius of fracturing was determined by ground microseismic monitoring, transient electromagnetic in the hole, and comprehensive determination of regional seepage volume, which was 22.5-32m. The average gas extraction pure volume in DY-1 and DY-2 boreholes was 1.36m3/min and 1.22m3/min, respectively. After fracturing, the maximum and minimum gas extraction pure volume in a single borehole increased by 49% and 16%, with an average increase of about 30%. This technology has a good effect on increasing permeability in thick and hard coal seam areas, laying a foundation for the construction of advanced gas treatment systems in large regions in the future.

In order to study the law of fracture and displacement of nearly upright extra-thick coal seam rock formations, theoretical analysis, physical similar simulation, on-site observation and other means are used to establish a mechanical model to study coal seam overburden by combining theoretical analysis and on-site measurement Circumstance. The results show that the fracture of the nearly upright coal seam is mainly concentrated in the direct top rock layer, and with the increase of the mining depth of the working surface, the top slate layer first appears out of the layer, and the overturning break occurs under the action of gravity, the rock blocks near the top plate of the working surface are mostly dumping movements, the rock blocks near the bottom plate of the working surface are mostly downward movements, and the rock blocks in the middle of the goaf area are mostly falling and flipping movements. Through on-site testing, it is found that the stratification and breaking of the rock layer are affected by the mining of the working surface and the top floor, and the direct top rock layer is greatly affected by the mining of the working surface, the movement is more intense, and the basic top is more stable. By further studying the collapse of the top and bottom slate layers of the nearly upright coal seam, and grasping the fracture and transportation of the rock layers of the nearly upright coal seam group, it provides reference for the comprehensive exploitation of the nearly upright coal seam and other conditions for the disaster prediction and disaster prevention and control caused by the broken transportation and displacement of the coal rock seam, so as to ensure safe production.

In response to the problem of large-scale instability and damage caused by coal pillars and surrounding rock support systems of the gob-side entry driving surrounding rock in deep weak coal seams with strong dynamic pressure, the deep horizontal coal roadway of Dongpang Mine is taken as the research object to reveal its failure mechanism; The theoretical analysis method was used to obtain the location of the fault line of the overlying basic roof strata, and the numerical relationship between the size of the coal pillar and the internal and external stress fields, as well as the width of the limit equilibrium zone, was clarified; By introducing the deviatoric stress analysis index, the response characteristics of the deviatoric stress and plastic failure field of the surrounding rock of the roadway under different coal pillar widths were studied. The reasonable width of the narrow coal pillar in the gob-side entry driving of deep strong dynamic pressure weak coal seams was determined to be 7 meters. Based on the width of a 7 m coal pillar, the distribution of deviatoric stress and plastic zone in the surrounding rock of the roadway at different positions of the advanced working face during mining was simulated and studied, and the strengthening range of individual pillars in the advanced working face was determined; Obtained the degree of plasticization of the roof, solid coal, and coal pillar walls after stable excavation, as well as the boundary line position of the peak stress zone; It is clarified that the coal pillar side of the gob-side entry driving is the key area for surrounding rock control. This paper elaborates on the control measures for surrounding rock when designing support, which require the anchor cable to pass through the boundary line of the peak stress zone of the surrounding rock and be within the relatively complete elastic zone in the deep part of the surrounding rock. A comprehensive treatment technology for surrounding rock is proposed, which includes “asymmetric channel steel truss anchor cable network on the side of the roadway + roof channel steel truss anchor cable joint point anchor cable + local fracture zone grouting modification + single hydraulic support advanced support”. Engineering practice has shown that the comprehensive treatment technology for the 7m wide coal pillar and surrounding rock support technology determined by the research can effectively ensure the safe recovery of the deep strong dynamic pressure weak coal seam working face.

In order to study the creep effect of roadway excavation in underground rock mass under complex ground stress, the model made of similar materials was loaded and unloaded by a self-developed analog test device. The experimental results show that, after a long period of graded cyclic loading and unloading, the tunnel subsidence occurs at 80% of the compressive strength of the model, and the radius of the tunnel decreases by 1.8%. The strain of surrounding rock exhibits creep characteristics with time, and goes through several stages, such as instantaneous strain, steady strain, hysteretic elastic recovery strain and residual strain. With the increase of load step by step, the strain value and elastic recovery strain both increased, but the increment of strain at each stage gradually decreased, reflecting the transition from elastic deformation to plastic deformation, showing a certain degree of permanent deformation. The trend of volume strain at each point is roughly the same as that of strain variation. Due to the application of load, the original stress state of surrounding rock is changed, resulting in stress concentration, and the creep of surrounding rock is caused by long-term cyclic loading and unloading, which promotes the emergence and expansion of cracks. In addition, the formation and development of cracks further aggravated the deformation of the roadway, resulting in the overall subsidence of the roadway and its shape becoming irregular. This study provides theoretical basis and experimental data support for similar simulation research on stable deformation and failure of deep roadway．

In view of the high fault concealment of hydraulic support and the lack of effective analysis and mining of a large amount of historical detection data, a fault diagnosis method of hydraulic support based on Fusion CNN Transformer (FCT) is proposed. This method can give full play to the advantages of CNN's extraction of local features and transformer's recognition of global information, and extract more useful features hidden in the data to realize fault diagnosis of hydraulic support. The diagnostic performance of the proposed method is verified by experiments with the historical data of hydraulic support in Shanxi Xiegou Coal Mine. The results show that compared with WDCNN model, transformer model and BiLSTM, the proposed method has a good fault diagnosis effect for hydraulic support, and the fault diagnosis accuracy rate reaches 99.59%. It provides a theoretical basis for determining the fault of hydraulic support and has certain engineering application value.

In the process of intelligent construction of coal mine fully mechanized mining face, there are problems with difficult perception of straightness and low measurement accuracy of scraper conveyor. To solve these problems, this paper designs a non twisted uniform multi-point dual core curvature sensor based on fiber optic grating sensing theory. A dynamic model of the scraper conveyor was established, and the angle recursive algorithm was used to establish the relationship between the various middle grooves of the scraper conveyor. Secondly, calibration experiments were conducted on the non twisted multi-point dual core curvature sensor, and the mathematical equation between the wavelength drift and angle change of the fiber optic grating was derived. Finally, a straightness perception experiment was conducted based on the actual working state of the scraper conveyor. The experimental results show that the fitted data of the sensor is highly consistent with the measured data, with a maximum error of no more than 3mm. It can achieve intelligent perception of the curvature of the scraper conveyor in the fully mechanized mining face, providing a new solution for monitoring the straightness of the scraper conveyor.

Permanent magnet synchronous motors have the advantages of low speed, high torque, high power density, and high efficiency, making them ideal driving devices for large scraper conveyors and belt conveyors used in mining. However, in practical work, there are many heating problems that restrict the better development of permanent magnet motors. Therefore, it is generally adopted to set up cooling channels inside the casing to cool and dissipate heat through water cooling for the entire motor, However, there are significant differences in the heat dissipation of permanent magnet motors with different channel structures. Therefore, based on computational fluid dynamics (CFD) software, numerical simulation studies were conducted on the heat dissipation characteristics of permanent magnet motors under axial and circumferential Z-shaped water channel structures. Three dimensional geometric models of the casing and complex flow channels were extracted, and grid division was carried out using ICEM. Boundary condition settings were completed, and the pressure field, flow rate, and temperature field under different flow channel structures were obtained through simulation analysis, Analyzed the influence of different flow channel structures on the heat dissipation effect of the motor. The results show that there is a significant imbalance in the temperature of the casing in different areas of the casing. The temperature of the casing in the axial Z-shaped water channel shows a circumferential distribution imbalance, while the temperature of the casing in the circumferential Z-shaped water channel shows an axial distribution imbalance. Under the same flow rate, the pressure difference between the inlet and outlet of the axial Z-shaped water channel and the average flow velocity of the cooling level are significantly greater than those in the circumferential Z-shaped water channel. Due to the faster average flow velocity of the cooling level inside the axial Z-shaped water channel, The maximum temperature of the casing and cooling water channel is lower than that of the circumferential Z-shaped water channel 6K-7K, so the axial Z-shaped water channel has better heat dissipation effect and can better control the casing temperature. The research results provide theoretical basis and technical support for the optimization design of the complex flow channel structure of permanent magnet synchronous motors, improving the cooling and heat dissipation effect of the motor, and driving performance.

There is a strong correlation between the effect of atomized droplet dust reduction technology and the droplet properties, and it is one of the basic contents to realize the safe mining and green development of mines to realize efficient dust capture and rapid dust reduction by adjusting the properties of dust reduction droplets. Based on the experimental platform of atomization and dust reduction combined with the micro and nano bubble generator, we tested the characteristics of the micro and nano bubble synergistic active water solution, atomization particle size distribution and dust reduction efficiency, and analyzed the mechanism of the micro and nano bubble synergistic synergistic active water dust reduction. The results show that: the micro-nanobubbles reduce the surface tension of pure water solution by 4.1 mN/m, and reduce the surface tension of active water solution by 3.0 mN/m, and the surface tension of micro-nanobubbles water gradually recovers to a state slightly lower than that of the state that doesn't contain micro-nanobubbles with the increase of the standing time; the concentration of micro-nanobubbles firstly rises and then decreases with the pre-mixing time, and then tends to be stable, which gradually decreases with the standing time; the pre-mixing stable concentration of micro-nanobubbles active water is higher than the pre-mixing stable concentration of micro-nanobubbles active water. The pre-mixed stable concentration of micro-nano bubble water is higher than that of micro-nano bubble water, and the bubble burst rate with the resting time is lower than that of micro-nano bubble water; micro-nano bubbles are added into the atomized dust reduction water, with the increase of the water supply pressure, the particle size of the atomized droplets decreases; under the same conditions of the water supply pressure, the efficiency of the micro-nano bubble water for dust reduction is large; the micro-nano bubble water has a stronger ability to capture fine dust, which is important research significance for the protection of the workers' life safety and health and improve the efficiency of safe production and the safety of the workers. It has important research significance and application value to protect the life and health of workers and improve the efficiency of safe production.

The effective detection of the distribution range and development trend of spontaneous combustion high temperature area of coal gangue yard is the key and difficult point to control spontaneous combustion area.In this paper, a comprehensive detection method is used to identify the high temperature zone of spontaneous combustion. First, the direct temperature measurement method inside the covering medium is used to determine the plane distribution range of the temperature field, then the extended range and depth of the spontaneous combustion zone is detected by high-density electrical method, and finally the accuracy of the location and range of the spontaneous combustion zone is verified by drilling temperature measurement method.The results show that the comprehensive detection method is feasible to determine the plane and depth extension of the high temperature area of spontaneous combustion in coal gangue yard, and can provide a new idea for the detection of high temperature area of coal gangue yard.

In order to study the shear characteristics of open-pit slope mudstone under the condition of flooding, direct shear tests are carried out on three kinds of mudstone under different normal stress conditions in the dry and saturated state of Shenshan open-pit in Inner Mongolia. The results show that the macroscopic shear mechanical characteristics of the same mudstone under different test conditions and different mudstones under the same test conditions are different. The osmotic effect of mudstone immersed in water is the main mechanical factor affecting its shear properties. The influence of flooding conditions on slope stability and instability mode of Shenshan open-pit mine is studied by numerical simulation. The research results have important reference value for the safety production of Shenshan open-pit mine and similar mines.

In order to reduce the moisture content in fines of thermal coal,a new approache are explored based on the characteristics of moisture occurrence coal fines. The characteristics of moisture occurrence in low-rank coal were analyzed using Nuclear Mag-netic Resonance (LF-NMR) and Brunauer-Emmett-Teller (BET) techniques. An experimental setup for airflow-centrifugal field de-watering was developed to examine the effects and characteristics of the force field environment and airflow properties on the dewatering efficacy for coal fines, across different particle sizes and for pore water. The experimental result indicated that the feedstock possesses developed porosity, predominantly consisting of ink-bottle and slit-plate mesopores, with moisture chiefly located in meso and micropores, and a 33.95% share of moisture in macropores. A solitary centrifugal force field could reduce product moisture to 15.47%, and the extent of moisture reduction gradually de-creases with particle size diminishing, indicating superior dewatering performance for coarser parti-cles, primarily removing surface water and marginally reducing macropore water. In the scenario of synergistic dewatering with an airflow-centrifugal field, both surface water and 68.08% of macropore water were eliminated, reducinging the moisture content in coal fines to 13.08%. With particle size decreasing, the reduction extent of moisture content progressively increased, with sur-face water being thoroughly removed. The synergistic dewatering effect of the airflow-centrifugal field is pronounced, with airflow chiefly facilitating the removal of particle surface water and macropore water by opening and enlarging the dewatering pathways between material layers and through thermal effects.

The long-term coal mining activities in the Huainan Mining Area have played a significant role in ensuring the energy supply and promoting economic development of the local and surrounding regions. However, the ecological and environmental issues such as vegetation destruction and land damage that have arisen have also attracted high attention from relevant departments. With the continuous deepening of ecological civilization construction, the ecological restoration of coal mining areas has gradually become an urgent environmental governance task. Since 2016, the Huainan Mining Area has carried out land reclamation and ecological restoration projects for coal mining subsidence water accumulation areas. To effectively monitor the land reclamation effects of these projects, this study selected Landsat series remote sensing images from 2016 to 2024. The study first used a random forest classifier to extract the main types of land cover in the study area; then, the Remote Sensing Ecological Index (RSEI) model was applied to calculate the comprehensive ecological quality index for each year, and the natural break method was used to grade the ecological quality. The results show that the cultivated land areas within the Huainan Mining Area generally perform well in terms of ecological quality, while the water-accumulated areas have relatively poor ecological quality. From 2016 to 2024, the overall ecological quality of the Huainan Mining Area has shown a downward trend, especially in the water-accumulated areas, where this change is more pronounced. Urban and mining area construction activities, as well as ground subsidence and water expansion caused by coal mining, are the main reasons for the differences in ecological quality and its changes in the mining area. Analyzing the ecological environment quality by mine unit reveals that Zhuji Dong Mine, Dingji Mine, Pan Si Dong Well, and Guqiao Mine are four mines with relatively good ecological environment quality.

Abstract：This study assessed the ecological resilience of resource-based cities from the perspective of landscape pattern, and explored in depth the close relationship between landscape pattern, ecological resilience assessment, and ecological network pattern. Landscape pattern directly affects ecological resilience by determining the structure and connectivity of ecological networks, thus shaping the resistance, adaptability and resilience of urban ecosystems to environmental changes. By analyzing the distribution, connectivity, diversity, and ecosystems subject to anthropogenic and natural disturbances of each landscape unit in resource-based cities, the ecosystem's resilience in the three dimensions of pressure, state, and response was comprehensively assessed. The evaluation not only reveals the current state of urban ecosystems, but also assesses their resilience in response to external pressures. The MSPA (Morphological Spatial Pattern Analysis) method was used to identify ecological source sites and analyze the impact of mineral activities in Pingdingshan City on these ecological source sites. The MCR (Minimum Cumulative Resistance) model was also used to construct ecological integrated resistance surfaces, and potential ecological corridors in Pingdingshan City were designed through circuit theory methods to enhance the connectivity of the urban ecosystem. The results show that the overall ecological resilience of Pingdingshan City is poor, with five administrative districts at lower and lower levels, three at medium levels, and two at higher levels, and 14 ecological source areas with a total area of 1022.417 km2 and 26 ecological corridors with a total length of 280.256 km were identified.Finally, in combination with the ecological resilience of Pingdingshan City and the current ecological network pattern, a practical and feasible ecological resilience enhancement plan is put forward. Finally, practical and feasible ecological resilience enhancement proposals are made to improve the landscape pattern and ecological network pattern of resource cities, and to comprehensively enhance the health and sustainable development capacity of resource city ecosystems.

Aiming at the harsh environment in the coal mine, a multifunctional integrated mine AGV is designed independently to replace some manual operation procedures and realize inspection and auxiliary rescue functions in emergency situations. In order to overcome the special environment under the mine, the explosion-proof design and the rationality of the mechanical structure are emphatically considered to ensure that the closed part of the vehicle and the external necessary sensors meet the explosion-proof or flameproof standards. In order to further expand the autonomous operation function, a SLAM navigation scheme based on radar-inertial fusion is designed, and an improved loop detection laser mapping algorithm is proposed for test and test. The real-time optimization of the algorithm is carried out by LiDAR with different line numbers. The effect is tested through the indoor ground environment mapping test and the real tunnel mapping test under the mine successively. Among them, the above ground test movement distance is 60m, the maximum sudden fluctuation in the Z-axis movement direction of the vehicle is less than 0.06m, the underground test movement distance is 200m, and the maximum sudden fluctuation in the upper and lower parts of the vehicle is less than 0.25m under the condition of the bumpy ground under the mine. The key part of the Z-axis regularity is only 3.87%, and the X-axis direction is about 0.37%. It is proved that the robot has high stability of motion and excellent robustness of map construction, and can successfully complete inspection and rescue tasks, which is of great significance for the breakthrough of key technologies in the AGV neighborhood in the mine.

In order to solve the problems of drilling and spraying holes in the bottom drawway of Alpine Coal Mine, over-limit of gas, long cycle of gas control in the mine, large amount of drilling construction work, which in turn caused the tight succession of mining and excavation, etc., the company optimized and improved the blowout preventing pipe and the blowout preventing tee, the "cinder-water-gas" separating box, and developed the spiral conveying device, traveling device and power-off protection device. By optimizing and improving the blowout prevention pipe, blowout prevention tee, "cinder-water-gas" separation box, supporting the development of screw conveyor, traveling device and power failure protection device, the company has formed a high-efficiency blowout prevention device with multiple sealing and blowout prevention systems, including "orifice - blowout prevention tee - separation box", and has also combined the drilling process to propose a multiple sealing process of "orifice - blowout prevention cylinder - separation box", which has formed a completely closed and negative pressure blowout prevention system. In addition, the construction process of the fully enclosed negative pressure continuous pumping blowout preventive device has been formed, which realizes the fully enclosed management of cinder, water and gas in the process of blowout during the drilling construction, and has been tested on site in the 1907 bottom pumping lane of Gaoshan Coal Mine. The results of the field test show that: the device and its process realize the fully closed treatment of drilling slag, water and gas in the process of drilling and blowing holes, effectively controlling the gas overrun, and when blowing holes occurred in the drill holes, the maximum concentration of gas in the extraction pipeline was about 26%, and the maximum concentration of gas in the return air flow was 0.05%, and there was no overrun of gas limit, and under the premise of adopting safety measures, the continuation of drilling was guaranteed, and the feed footage The maximum drilling speed reaches 60m/shift, which is 1~1.5 times higher; the fully enclosed negative pressure continuous pumping anti-spraying device can effectively control the problem of gas overlimit, ensure the fully enclosed management of drilling slag, water and gas in the process of drilling and spraying holes, effectively control the overlimit of gas, ensure the continuity of drilling construction process, and shorten the cycle of gas management, which provides an important demonstration and leading role for the management of gas in similar mines.