Abstract: With the rapid development of independent mining areas, urban mining areas are gradually formed in the surrounding areas to serve the mining areas, resulting in the mining areas being surrounded by cities, forming mining areas with economic and social functions closely related to the city, and the development characteristics of mining city space adhesion. With the gradual depletion of mining resources, urban mining areas in the transformation and development of a unique location advantage close to the city, mining city "collaboration" has become a development trend. Therefore, how to optimize the spatial structure and functional organization of urban mining area and realize the coordinated development of mining area and urban production, life, ecology and regional transportation is a key research. Taking Fushun West Open-pit Mine as an example, based on the research data and existing research results, this paper combs the spatial evolution process of the West Open-pit Mine City, clarifies the spatial organization rules and characteristics of the formation of the West Open-pit Mine, and systematically proposes four coordination systems:spatial structure coordination, spatial function coordination, spatial development goal coordination and spatial regional coordination Four strategies for the transformation and development of urban mining areas are proposed.

In order to realise floor dinting of roadway for coal, filling body false roof should be built. Aiming at roof condition, support strength requirement and the measured deformation law of roadway surrounding rock, false roof strength was designed in combination with anchor bolt(cable) support strength theory and mechanics of materials, and the filling material, system composition, filling interval, space erection, sealing treatment, filling process were confirmed. Research suggested that the strength of roadway filling body false roof should not be less than 6.6MPa, and the filling material should be paste material that consisted of loess, river sand, cement, additive and water, the filling interval was 10 meters, the filling space was built by scaffold, form board, elastic gasket and so on, and the seal between the board and the coal wall was built by underholing and gasket.

According to the features of high gas pressure, low air permeability, softness, breaking, and serious outburst hazard in the K4 coal seam of Yanjing No. 1 Mine, there are problems such as slow uncovering speed, long time passing through the coal seam, serious roof fall, and greater danger of coal and gas outburst during rock cross-cutting coal uncovering construction in the excavation of this kind of coal seam and rock roadway. In order to solve such problems, researching adopting a new technology of pressing crack-solidify-pre-draw integration, step-by-step implementation of trinity comprehensive outburst prevention measures such as high hydraulic fracturing, rock cross-cut solidifying and pre-drawing can fundamentally prevent the occurrence of coal and gas outburst accidents, and effectively shorten the period of uncovering coal at the stone gate, and improve the efficiency of uncovering the coal at the stone gate. In the true sense, the stone gate can be opened quickly and safely, thereby forming a set of safe, efficient and practical technology for rock cross-cut coal uncovering, which is especially suitable for uncovering cross-cut coal in soft and broken coal seams with strong outburst danger, high gas pressure, high ground stress, and low air permeability.

The main inclined shaft belt conveyor is responsible for the transportation of raw coal in coal mine, and is the key throat equipment in coal mine production. The electric control system of main inclined shaft belt conveyor in Xiaobaodang No.1 Coal Mine adopts remote control interface and frequency converter control technology for intelligent speed regulation according to the real-time collected coal flow. Compared with the traditional electric control system of belt conveyor, it reduces the no-load and light load operation rate of main inclined shaft belt conveyor system (including single main inclined shaft belt conveyor) to the greatest extent, thus significantly reducing energy consumption, Extend service life. This paper not only introduces the composition of the electric control system of the main inclined shaft belt conveyor in Xiaobaodang No.1 coal mine, but also expounds the functional characteristics of each subsystem equipment in detail, which has a certain reference significance for the engineering design of the electric control system of the main inclined shaft belt conveyor in coal mine.

Partially encased composite concrete column is a new type of composite structure, which can be used not only in the construction of industrial workshops, but also in the reinforcement and reconstruction of old workshops. In order to study the influence of web thickness, flange thickness, flange width, transverse link spacing and concrete strength grade on the seismic performance of partially encased composite concrete columns, 11 finite element models were established by ABAQUS software to analyze the influence of the above factors on the hysteretic performance, ductility coefficient and lateral stiffness of partially encased composite concrete columns. The results of finite element analysis show that when the flange thickness is 12 mm, the seismic performance of partially encased concrete column is the best, and the ductility coefficient is the largest. With the increase of flange width, the hysteretic performance and stiffness degradation performance of partially encased composite concrete columns change slightly, and the ultimate bearing capacity increases. The thickness of web and the spacing of transverse links are not important factors affecting the seismic performance of columns. It is suggested that the concrete grade of partially encased composite concrete columns should not be greater than C50.

In order to solve the problems of severe deformation and damage of pre-excavation removal channel in extra thick seam，the displacement changes of the main removal channel during the final mining stage were monitored on site, and it was concluded that the surrounding rock deformation trend of the main removal channel was mainly divided into three stages, namely the stage not affected by mining, the stage affected by mining and the stage affected by severe mining ; Numerical simulation on the distribution of the plastic zone before and after the main removal channel permeated with working face. An integrated control technology of bolt-beam-injection was proposed to achieve effective control of the surrounding rock of the main removal channel, and strong surface protection was achieved through the support of bolts and cables; long anchor cables and rigid I-beams were used to form anchors with strong jacking capabilities beam structure; Taking injection method to strengthen the coal bearing capacity of the sidewalls. The field application showed that the integrated control technology of anchor-beam-injection could greatly reduce the deformation of the surrounding rock of the main removal channel during the final mining stage and ensured the smooth withdrawal of the working face.

Based on the research background of the surrounding rock control in 3304 working face of Hanjiawan coal mine, the deformation characteristics of the surrounding rock in the back channel are analyzed by combining the on-site monitoring, theoretical analysis and numerical simulation. The results show that in the last mining stage of the working face, due to the influence of stress concentration, the back channel has roof subsidence and spalling. In order to solve this problem, the distribution characteristics of the stress and strength of the remaining coal pillars and the width of the coal pillars are calculated and analyzed. Based on the actual production, different support schemes of the withdrawal channel are proposed. The numerical simulation method is adopted to compare and analyze the different support schemes, and it is concluded that the stability of the surrounding rock of the withdrawal channel is difficult to be guaranteed due to the improper selection of the parameters of the original design scheme Qualitative. Therefore, the parameters and models of the bolts (cables) on the side and top of the back channel should be adjusted reasonably, and finally the measures of combining internal and external support should be taken to ensure the smooth completion of the back channel.

Aiming at the problems of difficulty in drilling and forming holes in structural soft coal and lack of effective drilling and anti-collapse hole technology, this paper constructs a three-dimensional mechanical model of soft coal along the bed drilling and slagging process, and systematically analyzes the drilling pressure and slagging power , The impact mechanism of drilling speed on hole wall stability and slag discharge effect, the main controlling factors of drilling instability are obtained, and the mathematical relationship between the amount of coal dust accumulation in the hole, drilling pressure and slag discharge power is given According to the formula, the characteristic curves of weight-on-bit and drilling speed, rotation speed and drilling tool wear were obtained, and finally the soft coal medium-speed controlled pressure drilling technology was proposed and practiced in the No. 4 coal seam of Zhujiadian coal mine. The results showed that: The depth of the final hole of the borehole first increases and then decreases with the weight on bit, and with the increase of the speed, the rate of decrease increases, and the number of collapse hole clamps and the weight on the bit are "V"; the depth of the final hole is less affected by the speed. The medium-speed stage shows a trend of increasing and stabilizing. In the low-speed and high-speed stages, the number of clamping drills is obviously higher; the reasonable range of feed pressure is 60～80kN, and the rotation speed is 130～160r/min. Combination of zero pressure idling, in the case of mylonitic coal, it is necessary to adopt a positive-negative pressure alternating pressure mode.

Abstract: With the majority of coal mines -550m shallow coal resources have been recovered in Huainan mining area, both the No.1 coal and above of it in the deep bottom began to be mined. In view of the complex hydrogeological and thin aquifuge conditions of underlying strata in the mining process of the bottom coal group in Xinji No.2 mine, it will face severe water inrush threat from Ordovician limestone karst fracture confined aquifer. In order to effectively control the Ordovician limestone water disaster in the mining of the bottom coal under the thick nappe. The paper puts forward the principles of regional control with mining area as unit in space, advanced treatment in time and transformation from coal seam floor C3Ⅰ and C3Ⅱ to C312 limestone in grouting. On this basis, combined with surface directional drilling technology, 2 main holes and 26 branch holes were constructed in 2201 and 2301 mining areas. The cumulative footage was 28562.42m, and the cumulative cement injection volume was 6278.13t. The results show that: after the implementation of surface directional drilling exploration grouting technology, the water level of the observation water level in the area has increased by 68.37m compared with the water level before grouting. The water richness of limestone aquifers in the Taiyuan Formation has been significantly weakened, and the water inflow of single hole of underground exploration and release drilling holes is less than 5m3/h, which ensures the safe mining of 10 working faces in the 2201 and 2301 mining areas, and liberates about 9.525 million tons of coal resources.The successful application of this technology has realized the safe and efficient mining of water inrush dangerous working faces under complex hydrogeological conditions, and provided a scientific basis for the prevention and control of Ordovician limestone water damage in similar mines.

In order to find out the development boundary and the distribution characteristics of the cementation degree of the broken body of the large-scale water-flowing collapse column, the distribution location and the approximate range of the large-scale water-flowing collapse column are found out by using the integrated geophysical exploration technology above and below the well. The development boundary, cementation and distribution characteristics of the fractured body of the water flowing collapse column are found out by means of comprehensive exploration techniques such as surface-oriented horizontal penetration rate logging, drilling fluid consumption, cuttings logging and logging while drilling, and through data statistical analysis. The length and short axis of the collapse column is 410m×200m. The fractured body in the collapse column is close to the water inrush point in the belt of the working face. The results of comprehensive geophysical exploration above and below the well and comprehensive exploration of horizontal directional drilling collapse column based on the ground provide a basis for grouting treatment and a good reference for other similar structures.

The abandoned roadway are left in the panel due to the mining with disorderly and cross-border pattern in small coal mines. The existence of abandoned roadway makes it easy take place the roof accidents during the mining, and brings huge safety hazards to the safe and efficient mining of the panel. Aiming at this problem, this article takes the E13103 panel of Cuijiazhai Mine as the engineering research background. Methods such as theoretical calculation, numerical simulation and field measurement are used to study the supporting pressure, coal pillar stability, roof pressure, support resistance in panel with abandoned roadway. The influence of the abutment pressure distribution for the roof stratum and abandoned roadway in the panel is revealed. The rule of the roof breaking and pressure distribution through the abandoned roadway are obtained. The study has obtained the breaking law of the roof and the distribution law of the bearing pressure in the process of the working face going through the empty roadway. The supporting resistance of the working face is the greatest in the interval from 7m to 10m before the working face exposing the empty roadway, so the supporting needs to be strengthened. It solves the problems of large roof pressure and falling that will occur when the panel passes the abandoned roadway. It provides a new method for or high productivity, quick and safe push of small coal mines. At the same time, it provides theoretical reference for the determination of the advance support distance, the prevention of the dynamic disaster of the surrounding rock of the panel, and safe and efficient push the panel with abandoned roadway.

Aiming at the problems that the top coal is difficult to caving under the conditions of fully mechanized caving mining in hard and thick coal seams, the existing blasting weakening methods are difficult to approve explosives, and the safety and controllability are poor. The paper proposes the "drilling-cutting-fracturing" directional hydraulic fracturing top coal weakening technology,and carried out field tests with the Shenshupan coal mine in the Yushen mining area as the engineering background.Borehole peeping and high-frequency electromagnetic wave CT technology were used to detect the fracture and expansion of the top coal body before and after fracturing, and the top coal recovery rate before and after fracturing was analyzed statistically.The engineering practice results show that the "drill-cut-press" directional hydraulic fracturing top coal weakening technology has a significant effect on the cracking and expansion of top coal cracks. After fracturing, the proportion of top coal cracks in the borehole increases by 23.5%, and the cracks expand through the range Over 10m.The recovery rate of top coal in the fracturing area has been significantly improved. The daily amount of top coal caving in the hydraulic fracturing section has been increased from 3243t to 3433t, an increase of 190t, an increase of 5.5%.The top coal recovery rate of the working face increased from 66.16% to 72.49%, which was an increase of 6.33 percentage points compared with that before hydraulic fracturing. The research results have important reference significance for improving the recovery rate of fully mechanized caving mining in hard and hard-to-fail coal seams.

Abstract: In order to solve the problems of severe air leakage, corner gas accumulation, natural wind pressure, and low oxygen concentration in the shallow mining face of the horizontally sectioned shallow mining face of steeply inclined and extra-thick coal seams, Wudong Coal Mine +600 level 45# coal seam Take the fully mechanized coal mining face in the east wing as an example. Based on the measured data on site, a pressure equalization ventilation scheme and monitoring method are proposed to ensure the balance of wind pressure between the working face and the goaf. Through the on-site measurement of the CH4, CO, O2 concentration of the return air corner and the air leakage of the working face before and after the pressure equalization ventilation is adopted, the results show that the pressure equalization ventilation system can prevent the corner gas from accumulating, the working face is low in oxygen, and reduce the air leakage in the goaf. It has played a good role; through continuous observation of the pressure equalization zone, the stability of the pressure equalization system is better, which is of great significance to the safety production of the mine.

Based on the engineering background of 15-31030 working face of No. 12 Coal Mine of Pingdingshan Tian'an Coal Industry Co., Ltd., this paper innovatively studies the withdrawal technology of backfilling and caving face. Through the analysis of the preparation before the quick withdrawal of the working face, the arrangement of the withdrawal equipment at the withdrawal site and the withdrawal process, the rapid withdrawal technology of backfilling and caving face is obtained. The problems of low efficiency, poor safety and unsuitability of equipment withdrawal mode in fully mechanized mining face for equipment withdrawal in backfilling and caving face are solved. The work efficiency is improved, the safety in withdrawal process of backfilling and caving face is guaranteed, and the normal replacement of mine working face is guaranteed.

In order to solve the inspection problem of belt transport system in underground coal mine, a rope traction track inspection robot system was developed.This system USES PLC and frequency converter control box, and realizes the robot to move back and forth along the track for inspection by motor traction wire rope.The composition and function of wire rope traction track inspection robot system are introduced in detail.The application results show that the inspection robot system has strong practicability and is of great significance to the construction of intelligent mine.

The instability of composite roof in deep mining height working face is easy to cause dynamic disaster. Therefore, the prerequisite for safe mining is to study movement rule of composite roof and full load state of support under deep conditions. This paper takes large mining height working face group at No. 2 Mine of Huangling Mining Group as example, applying research methods including field investigation, numerical calculation, theoretical analysis and field monitoring to analyze the types and movement characteristic of roof. According to the relationship between surrounding rock and bracket and the requirements of bracket, two-pillar shield bracket of ZY12000 / 28 / 63D was finally selected. Research shows that direct roof of 418 working face is composed of upper fine sandstone and siltstone totaling about 21.2m, of which siltstone has bearing capacity and is force source for mine pressure. With the changing of working faces, the settlement status of roof present dynamic change of V-Shape-Convex-Shape-U-Shape and the edn of working face experience more intense pressure. Analysis shows that under full load, the displacement of the top of the bracket is large, and force at component connection is also large. Support is adaptive to the roof pressure during periodic weighting and can meet the need of safe production.

In order to study the influence of the cutting roof on open-off cut and transportation gateway with floor drainage roadway on the failure depth of floor and mining pressure, taking the 14141 face of Jiulishan as an example, the numerical simulation was used to contrast and analyze the influence of cutting roof on the failure depth of floor under different conditions, combining the results of the actual measurement on site and numerical simulation to analyze the behavior of mining pressure.The results show that the failure depth of the transportation gateway with floor drainage roadway is about 14.5m, pre-split blasting to cut roof of open-off cut and transportation gateway with floor drainage roadway can effectively cut off the mining pressure transmission path, reduce the main roof’s step of the first pressure, the step of periodic weighting roadway’s abutment pressure, and the failure depth of floor. It is of great reference significance for the safe mining in Jiaozuo area and the whole country’s mines which are seriously threatened by confined water and coal and gas outburst.

In China's coal industry, the microseismic monitoring system has been widely used in various rock burst mines. However, the microseismic monitoring system among mines only monitors the inner part of the mine field. But, for the boundary area of the mine field, the positioning accuracy are relatively low. The dynamic phenomena induced by inter mine mining disturbance appears in many mining areas with the increase of mining depth and intensity in China. Based on the background, a associative microseismic monitoring system was set to enhance the cooperative monitoring effect of dynamic phenomena caused by mining disturbance in the boundary area. The system is installed in Yuejin coal Mine. The monitoring results show that the system has achieved good application results, the main performances are as follows: (1) The effective monitoring range of the microseismic system is increased, especially for the boundary area of the mine field; (2) The union mine microseismic makes the boundary area of the mine field transfer from the outside of the network to the network, and the positioning accuracy is improved. It is found that the scope of rock fracture near the boundary coal pillar is mainly concentrated behind the goaf of 21220 reflected by a large number of high energy events.

In this paper, LC20 strength grade fly ash ceramisite concrete was deployed. The uniaxial compressive strength and young’s modulus of the concrete were tested in the laboratory. The mechanical properties of fly ash ceramsite concrete and ordinary concrete were compared and analyzed. The mixing ratio scheme of bolting and shotcreting support underground has been determined. Then, the field industrial test was carried out in Cuncaota No.1 Coal Mine of Shendong Coal Mine Area, according to this mixing ratio scheme. The results show that, the uniaxial compressive strength of LC20 strength grade concrete fly ash ceramisite concrete can reach 29.6MPa in 28 days, which has been deployed in the laboratory. The young’s modulus of fly ash ceramisite concrete is smaller than the ordinary concrete, and it is more adaptable to the support conditions of coal mine roadways. The uniaxial compressive strength of the fly ash ceramisite concrete, which were shotcreted in the field, can reach 29.9MPa. The support effect of fly ash ceramisite concrete is good and it has high feasibility. The research results will provide the theoretical basis and construction experience for the application of fly ash ceramisite concrete in coal mine.

In order to deeply understand the change law of the gas enrichment and migration zone in the overlying strata mining fracture zone, and improve the gas drainage capacity of the mine goaf. Based on the evolution theory of overburden rock fissures, and based on the main mining face of Wangjialing Mine in Shanxi, using physical similarity simulation methods, the changes in the gas enrichment and migration zone in the underlying rock fissure zone affected by the mining of the face were studied. Based on the research results, the gas drainage test was carried out on the site with high-position directional long boreholes. The research results show that mining affects the development of cracks in the overlying rock in the goaf. After the fourth cycle of compression, the cracks are fully developed. The height of the crack zone is 28m~92.3m, but the height of the gas enrichment and migration zone is in the second cycle. After being pressed, it is stable within 52m. In the field test, the parameters of the high-position directional long borehole were optimized and adjusted, and the drainage effect of the borehole located in the enrichment area was significantly higher than the drainage effect outside the enrichment area, and the high-position directional long borehole was stable in drainage During the period, gas drainage accounted for 55% to 75% of the absolute gas emission. The research results provide a certain theoretical basis for the identification of gas enrichment and migration areas in the overburden fissures caused by mining, and the precise extraction of gas in the overburden fissure zones.

Aiming at the problem of lack of dynamic quantitative evaluation methods in the three-zone linkage engineering practice process of high outburst mines under coal seam conditions, this paper takes the Shaqu No. 1 mine in Liliu mining area as an example to redefine the scientific connotation of the three-zone linkage and systematically analyze the quantification of the three-zone The assessment indicators, the characteristics of extraction technology, and the duration of action reveal the principle of dynamic evaluation of its effects. Theoretical analysis was used to screen out the safety indicators, resource productivity, drilling footage rate and other indicators of the three zones, and a progressive dynamic evaluation model for the three-zone linkage phase was constructed, and the functional relationship between the two indicators, four parameters and time in the three stages was given Formula, and determine the critical value of each index, clarify the overall process of dynamic evaluation. The residual gas content and gas pressure of each section of the 2# and 3+4# coal seams in the three-zone linkage process of Shaqu No. 1 Mine are less than the corresponding critical values, and the gas index in the production area has the largest decline rate; the conversion rates of the three districts were 95%, 85%, and 90%, and the dynamic conversion rate of the entire minefield was 70.5. %, indicating that the connection between extraction and mining is relatively tight, mainly manifested in the poor pre-drainage effect in the preparation area, which is consistent with the on-site extraction situation.

The thermal deformation of coal seams under the action of thermal coupling is very important for the evaluation of strata movement and deformation in underground high temperature projects such as underground gasification direct liquefaction and in situ heat injection mining of low metamorphic coal. Using self-developed servo control of multifunction high temperature triaxial rock mechanics testing machine, polarization-maintaining river in shan'xi coalfield long-flame coal is studied in two different hot deformation characteristics of in-situ stress conditions, the results show that: (1) in 5 MPa (equivalent to 200 m depth), 7.5 MPa (300 m depth) in-situ stress conditions, long-flame coal within 500 ℃ characterized by thermal expansion deformation, thermal expansion coefficient with the temperature rise can be divided into three stages: begin to increase, increases sharply increase stage, slow, and can be represented by piecewise linear function relation between temperature;(2) The triaxial pressure has a significant influence on the thermal deformation of long-flame coal. The higher the pressure is, the higher the temperature point at which the thermal expansion deformation begins and the smaller the thermal expansion coefficient is.(3) The higher the triaxial pressure is, the higher the temperature corresponding to the peak thermal expansion coefficient is. For example, when the ground stress is 5MPa, the temperature corresponding to the peak thermal expansion coefficient is 400℃. When the ground stress is 7.5mpa, there is no peak thermal expansion coefficient within 450℃, so the required temperature may be higher.

Coal and rock identification technology is the bottleneck restricting the development of coal mine tunneling and coal mining to automation and intelligence. In order to realize the accurate recognition of coal-rock interface, this paper collected high-sensitivity images of coal mine roadway heading surfaces in a mining area in Ordos, and proposed a pixel classification based on machine learning and a boundary extraction algorithm based on digital image processing: (1) Binary the image first The boundary tracking algorithm is used to extract the boundary of the binary image; (2) Aiming at the problem that the direct use of binary images will extract a large amount of non-boundary information, the classification effects of four machine learning algorithms such as Maximum Likelihood Estimate, K-means clustering algorithm, Support Vector machine and BP neural network are compared and studied. Choose the best BP neural network as the classification model;(3) Aiming at the problem of a large number of small "holes" near the boundary, a morphological processing-based elimination method is proposed It provides a good foundation for extracting continuous single-pixel width boundaries. Based on this, a coal-rock interface recognition method based on boundary tracking algorithm and artificial neural network is proposed, which provides a basis for the adjustment of the cutting height position of the roadheader and shearer drum. The test results show that the final coal-rock boundary is extracted It is basically consistent with the real coal-rock interface. The method proposed in this paper was used to verify the original images collected from the coal mining face in Yujialiang, Shenmu, Shaanxi, and achieved good results, verifying the effectiveness and reliability of the method.

At present, traditional downhole conduction height detectors generally use two independent pipelines for capsule expansion and water filling in the detection section，in practical applications, the drill pipe and the inflatable tube are easily twisted or squeezed, and the existing observation equipment can only observe the drilling leakage under a single pressure state. The data is single and non-comparable. In order to solve the above problems, a single The water source grading multi-pressure downhole conduction height detection system, the observation system includes the I-level high-pressure injection-pushing integrated system, the II-level high-pressure capsule expansion system, the III-level low and multi-pressure progressive detection system, realized by the high and low pressure grading conversion of the pressure reducing valve Single water source capsule expansion and water detection are integrated, using high pressure to convert into different levels of low pressure to achieve low and multi-pressure progressive detection. Systematic research can solve the problem of low detection success rate of traditional instruments, and can enrich the detection data of water-conducting fracture zones under different low pressure conditions. It is useful for studying the water-conductivity of mining fractures under multi-pressure conditions and accurately detecting the height of water-conducting fracture zones. important meaning.

In order to determine the effectiveness of transient electromagnetic method and magnetotelluric method in detecting goaf hydrops in coal mine, based on basic principles and working methods of the two methods, taking a coal engineering in Jixi Coal Mining area as an example, the transient electromagnetic method and magnetotelluric method are applied to carry out ground comprehensive geophysical prospecting in the coal mine exploration area. Through the comparative analysis of inversion results and known data, the drilling verification research is carried out. The results show that the apparent resistivity variation characteristics of the inversion results detected by the two methods are basically similar, which can better reflect the electrical property features of the formation. It is inferred that the distribution range of one goaf hydrops in the exploration area is also relatively consistent, which is basically identical with the actual field data and drilling results, verifying the effectiveness of the two methods. Practice has proved that the comprehensive geophysical prospecting of transient electromagnetic method and magnetotelluric method can be used as an effective method to find goaf hydrops of coal mine, can provide technical support for coal mine water, and has very important engineering value value.

Overexploitation of energy in mining areas and shortage of water resources have become important factors restricting the development of the coal industry. In response to the urgent need for water resources environmental monitoring in mining areas, this paper proposes a multi-channel spectroscopy method real-time monitoring water environment. This method monitoring the water quality of the target area collects real-time spectral images of water body through multiple channels, calculates its spectral reflectance and inverts the chlorophyll-a (Chla), total phosphorus (TP) and total suspended matter (TSM) of the water body with regression equations which are obtained by statistical analysis of the optimal channel or channel combination data and water quality parameters. The results show that the spectral images obtained by this method conform to the spectral characteristics of different ground objects, which can achieve the effect of real-time dynamic monitoring of water quality changes in the area, makes up for the shortcomings of traditional monitoring methods in terms of timeliness and visualization effects, and is expected to provide reference and technical support for water quality monitoring in mining areas.

Abstract: Underground coal fire mainly refers to coal field fires and mine fires formed by human factors or spontaneous combustion in coal mines. It is a serious global geological disaster. While underground coal fires cause waste of coal resources, they also destroy the ecological environment. Therefore, it is very important to monitor the changes of underground coal fires and to control them. The burning of coal fires will release a lot of heat, causing abnormal surface heat. UAV thermal infrared remote sensing technology provides an effective technical means for accurately detecting the range of coal fires. This article uses the UAV thermal infrared remote sensing method to detect the fire area of the Baoan Coal Mine in Xinjiang. According to the adaptive gradient threshold method and the artificial threshold method, the temperature threshold segmentation and coal fire information extraction were performed on the thermal infrared images of the UAV in two consecutive flights, and the temperature measurement accuracy of the UAV thermal infrared camera was verified. The median error between the aircraft images is 0.97°C, which proves that the UAV has reliable temperature measurement accuracy and technical feasibility, and has reference significance for the precise delineation and fire suppression of coal fires.

In order to eliminate the Mined-out area on the safety of equipment and personnel，improve the mining and stripping efficiency of open-pit mine and ensure the safety of people's lives and property 。The paper is based on the geological conditions and mining conditions of the yuanbaoshan open-pit coal mine. The main factors that influence the stability of roof in open pit are determined，and the paper analyzes the advantages and disadvantages of the method of estimating the safety roof thickness of the existing roadway. The suitable method for estimating the thickness of safety roof is selected。Research results show that the air-field aspect ratio method takes into full consideration the main factors influencing roof stability in Mined-out area，it can be used as an estimation method for the thickness of safety roof in the roadway pillar Mined-out area of yuanbaoshan open-pit mine。Based on this method, the value curve of safety roof thickness of the main mining equipment in the field under different Mined-out area span conditions is drawn，it is of great importance to optimize the management time of Mined-out area, avoid the occurrence of cave-in accident in Mined-out area and ensure the safety production of open-pit mine.

In order to accurately evaluate the effect of capacitor series resistance circuit and capacitor terminal voltage on capacitor discharge energy, the designer can evaluate the capacitor discharge energy and judge whether it meets the requirement of Intrinsic Safety and explosion protection.in this paper, the capacitance equivalent circuit model which is consistent with the actual circuit is established by considering the parameters of inductance, capacitance and resistance of the circuit, different discharge forms are used to simulate and test the discharge process of the capacitor circuit. The mathematical model of capacitor discharge is established, and the simulation of the mathematical model is carried out by using Matlab software, and two curves of "Energy - Resistance（W-R）" and "Energy - Voltage(W-U)" are drawn, which can be consulted by designers, by this model,the efficiency of circuit product design is improved, the development cycle is shortened and the development cost is saved for the enterprise.

In order to measure the content of coal seam gas, find out the distribution of aquifer and the water-rich in the top and bottom of coal seam and the occurrence of geological abnormal body on working face, it is necessary to obtain the coal core, coal sample and core in accordance with relevant regulations through drilling coring. According to the development of coring drilling technology and equipment in coal mine, combined with sealed coring technology, wireline coring technology and hydraulic reverse circulation coring technology, introducing the main technical methods which can gain related geological information of coal seam and rock formations in coal mine, summarizing respectively the technical principle, auxiliary equipment and application situation, combining with specific application of above three kinds of coring drilling technology in the underground coal mine and summarizing technical difficulties of above three kinds of coring drilling technology. Finally, the paper pointed out the research prospects and development direction of coring drilling technology in coal mine and provided relevant suggestions to accelerate the development of coring drilling technology in coal mine, which provides reference for the development of coring drilling technology in coal mine.

?In the process of underground drilling in coal mines, broken drill pipe occurs at the place where the borehole collapses. Because of the enlargement of the borehole diameter, the position of the fish head is different from that of the borehole, and it is difficult to contact the fish head when fishing with male and female taps, it could easily lead to failure. Aiming at the difficulty and low success rate of fishing for drill pipe break accident in the enlargement of the borehole diameter, the fishing technology of movable elbow joint is first developed, which is suitable for the fracture accident of drill pipe in underground coal mine, and develops a movable elbow joint of cam-link type which is compatible with the technology.The fishing technology of movable elbow joint is successfully used to deal with the broken drill pipe in the drilling site, which shows that the fishing technology of movable elbow joint can effectively improve the success rate of fishing.

In order to effectively avoid the economic losses caused by budget overrun on coal engineering bidding and procurement, the cost budget control model of coal engineering bidding and procurement based on BIM Technology is designed to improve the economic benefits. BIM data management platform realizes the interaction and storage of coal engineering bidding and purchasing related data in IFC data through BIM data management kernel, accesses BIM storage data through BIM graphical interaction module and BIM resource manager module of platform user interface, and completes data operation and management; bidding and purchasing cost budget control module calls BIM data after processing, through cost monitoring and cost management Early warning and cost prediction function, combined with BIM software and cost software, realize the coal engineering bidding procurement cost budget control. The experimental results show that: the actual cost and budget cost of coal engineering bidding procurement of the model are the same, and the cost budget control is accurate; the progress of coal engineering bidding procurement is faster than expected, which has a significant effect of coal engineering bidding procurement cost budget control.

The revision points of China's series of national standards for steam coal compared with the original series of technical requirements for industrial coal were expounded from the aspects of standard name, standard category, technical index, marking, and transportation and storage requirements. The significance of the revision was also analyzed. The local standards in key coal-used city were listed and compared with the corresponding national standards. Technical indexes such as total sulfur, ash content, and calorific value in local standards are stricter than that in the corresponding national standards. The local standards published later also added the request of content of harmful elements in coal, which will further improving the quality of power coal in our country, and promote clean coal utilization.