In order to determine the location of Guxian coal mine industrial site and mine development plan reasonably, according to the coal seam occurrence conditions, mining technology conditions, mining methods and external ground construction conditions of Guxian coal mine, and based on the principles of reasonable development and simplification of development system, reduction of the quantities of shaft and lane works, and normal replacement of mine production and mining areas, tianjiahui site and Guanpeng village site 2 are proposed Based on the analysis of the advantages and disadvantages of the two industrial sites, tianjiahui site was finally determined as the mine industrial site, and on the basis of tianjiahui industrial site, the mine development plan of "inclined mixed development + trackless transportation" was proposed. The results show that the exploitation mode of the mine field can maximize the utilization of resources, improve the economic benefits, promote the scientific and balanced production, and lay a foundation for the sustainable development of the coal mine.

With the gradual depletion of shallow coal resources, the depth of coal mining will increase, and the mining equipment will gradually become larger and more heavy. The existing shaft lifting system will not be able to meet the overall lifting requirements of large equipment, so it is large in the underground. Equipment assembly stations and dressing stations are becoming more and more popular. This paper takes the large-scale equipment assembly station in Licun Coal Mine as an example to discuss the design and innovation of underground assembly station and dressing station.

At present, the use of software to carry out three-dimensional numerical simulation of large coal bunker cases rarely reported, the use of three-dimensional parallel computing is not a precedent. Based on an engineering example, by using the three-dimensional parallel finite element calculation program is developed by using elastic-plastic theory and choosing reasonable constitutive models, the numerical simulation for the support scheme of coal bunker in Dong Loutian coal mine is performed. The results show that the upper part of the upper part of the two side walls of the groove bin collapses and the lower part protrudes, and the overall deformation is a sliding trend when the excavation section is completed. The deformation occurs mainly in the direction of gravity, the deformation in the north-south horizontal direction is relatively small, the larger vertical deformation occurs mainly near the side of the slope inward when the backfill section is completed. The maximum deformation of the silo structure occurs at the upper and lower ends of the structure at the east side of the coal bunker, showing outward expansion at the upper end and inward extrusion at the lower end when the excavation backfill is completed. It is feasible to use three-dimensional parallel finite element method to carry out numerical simulation research on the backfilling process of trench excavation. the numerical results obtained from the simulation analysis meet the basic requirements of engineering and theory, and are in approximate agreement with the actual engineering measurement results, which is worthy of further popularization and application.

Abstract：In order to study the safe and efficient recovery of surface mining edge edge covering resources, the positioning and navigation technology of unmanned mining technology system was adopted. The practice data of experimental mining in Inner Mongolia autonomous region were collected. The inertial navigation system works independently, which is convenient to realize the unmanned operation of the coal mining face, improves the production efficiency and automation level of the process, and has better technical feasibility and economic rationality. Inertial navigation technology should be the research direction of the navigation technology of coal pressing and recovery process system of roadway mining.

The paper introduces the present situation of the coal cleaning and the product structure at Jincheng area, based on the study of the coal washablity characteristics and its regularity, notes the limitation of using HMV+HMC method to wash local coal and point out a broadly taking narrow idea that coarse coal and fine coal should be cleaned separately locally, suggests the feasibility of use pressureless three product cyclone to wash Jincheng kilkenny coal, and gives an engineering example.

In order to solve the problem of broken roof in mining under the direct cover of caving zone,the idea of ground grouting reinforcement was put forward, and the drilling technology was studied systematically. According to the actual stratigraphic distribution and the characteristics of drilling through the collapse zone, in order to ensure the slurry to reach the target layer smoothly, the second opening structure drilling hole was designed. The high-quality low solid bentonite flushing fluid was selected to solve the hole wall collapse and other accidents. At the same time, the technical system of accident prevention measures was established. On this basis, taking the 7228 working face of Xutuan coal mine in Huaibei mining industry as an example, the drilling effect was analyzed. The research shows that the designed second opening structure drilling hole effectively guarantees the smooth construction of the drilling, and the exposed bedrock position is basically consistent with the original data. Basically, the strata affected area of 71 coal goaf and characteristics of fracture development have been basically identified. And at the same time, it also proves that the crack reinforcement effect of goaf is good through simple hydrological observation. The research results provide technical support for the drilling project of ground grouting to transform broken roof.

The pre-cracking drilling construction of coal mine roadway roof is the key technology of “110” construction method. For the construction method, the pre-cracking drilling method has low efficiency, high labor intensity and lack of special equipment. The ZDY2-300LM type slitting drilling machine has been developed. The rig has the characteristics of double-drilling arm, precise positioning and high construction efficiency, and has been promoted and applied in the Dongrong No. 2 Mine of Shuangyashan Mining Co., Ltd. of Longmei Group, with good effect. According to the characteristics of underground construction, a set of construction techniques suitable for cutting seam drilling is summarized. The successful application of the drilling rig provides equipment support for the extensive promotion of “110” method, which provides a reference for similar roof pre-cracking construction.

In the deep well state, the soft rock engineering problem has become an important engineering problem in the current deep mining. In this paper, the -980m cavern group of Xinhe Coal Mine is taken as the research background. Through theoretical analysis, the influence of different sequential excavation of adjacent chambers on surrounding rock failure is studied. Combined with FLAC3D numerical simulation software, different excavation sequences of adjacent chambers are simulated. And the minimum damage volume VP is calculated in the shaping zone, so it is concluded that the optimal construction scheme is BA2A3A1A4A5. Provide support design for the cavern group, it is suggested that bolting net , grouting anchor rope, whitewashing and grouting reinforcement should be adopted in the main part of pump house, in later stage can use steel reinforced concrete masonry lining for combined support; And it is suggested that bolt wire cable , shotcret and grouting reinforcement should be adopted in the niche，and in later stage can use steel reinforced concrete masonry lining for combined support. The supporting scheme is simulated by using FLAC3D numerical software, calculation results show that, the top, bottom and two sides of the chamber are effectively controlled. The results of field monitoring were analyzed, and the result shows, the maximum displacement of the two sides of the monitoring section is 8mm, and the maximum displacement of the top and bottom plates is 15mm. This suggests that the overall maintenance and support effect of the roadway is good, which can effectively control the surrounding rock and has good application value.

Abstract: Aiming at the problem that a large number of elastic energy can accumulate in the wide coal pillars of rock burst mine and easily cause ground pressure disaster accidents, based on theoretical analysis and field test, the integrated pressure relief technology of "drilling-cutting-pressure" is studied for the coal pillars of 21103 working face of Hulusu Coal Mine. Through arranging drilling holes, jet cutting and fracturing weaken the pressure relief of the coal pillars of the section and increase the plastic zone in the coal pillars of the section. Width reduces the accumulation of elastic energy, and at the same time, in order to reduce the negative impact of pillar pressure relief on roadway support, directional hydraulic fracturing roof cutting was carried out in 21003 working face air return roadway, which reduces the stress transfer from hanging roof in lateral goaf to pillar in section. The combined application of "drilling-cutting-pressure" integrated pressure relief technology and directional hydraulic fracturing roof cutting technology has achieved good practical results in the air return roadway facing 21003 work, and solved the contradiction that the increase of plastic zone width in the pillar of section is not conducive to roadway support.

Coalbed methane (CBM) radial hydraulic drilling technology is developed in recent years in China to increase the production of coalbed methane. In order to study the application effect of radial hydraulic drilling technology in coalbed methane wells, the principle and construction technology of this technology were analyzed, with the field tests of the radial hydraulic drilling being carried out for two coalbed methane wells in Gujiao mining area of Xishan area. The results showed that radial hydraulic drilling technology could increase the conductivity of coal seam, and the production of the tested wells were significantly improved, but the results are not enough satisfying. On this basis, the reasons why the production increasing was not obvious were analyzed from the aspects of geology and engineering, respectively. Though radial drilling technology has a certain application prospect in CBM drainage stimulation and hydraulic fracturing process optimization, it is necessary to increase the study of basic theories and optimize the construction process.

Abstract: Aiming at the difficulty of roof caving for the first time in the process of cutting advancing 15209 working face of zhangjiamao coal mine, field measurement, theoretical analysis and three dimensional hole model analysis were carried out, combined with the fact that the joints and cracks in the roof of the 5-2 coal seam are not developed, the coal seam on the working face is unstable and sandwiched with gangue, the water pressure cracking scheme of the roof is determined to ensure the stability of the coal wall and the top of the two roadway. For this reason, the roof is cracked by using water pressure to optimize the hole layout in three-dimensional space and through the cracks between the boreholes. According to the on-line monitoring of working face roof pressure and the field measured data analysis of coal wall and two sides deformation, the scheme has a good application effect.

Abstract: The roof of No. 2119 panel is broken in Fanjiacun coal mine. It will influence the quality of the support during the formation of the withdrawal gateway and the rate of hydraulic support retracement after the end of the mining. This paper takes 2119 panel as an example to introduce the use of constant resistance and pressure relief anchor cable support technology and roof pre-split technology under the condition of broken roof, which improves the safety of the roof of the reserved withdrawal gateway and working conditions during the process of hydraulic support retracement. The length of the constant resistance and pressure relief anchor cable support is determined to be 11.3m, the cutting height is 11m, the cutting angle is 20 °, the bidirectional pre-split cutting charge blasting structure is 3 + 3 + 2 + 2 + 2 + 1. Finally, the field monitoring shows that: The deformation of the withdrawal gateway roof and floor is 445mm during the withdrawal of the panel. The stress value of the constant resistance and pressure relief anchor cable finally stable at 288KN, the deformation of the withdrawal gateway is small, and there is no support crushing accidents. Achieving safe, rapid and smooth withdrawal of the support in fully mechanized panel. It provides a reference significance for the safe and rapid retracement of the support of the panel with reserved withdrawal gateway in other similar geological conditions.

In order to solve the floor water inrush caused by serious roof pressure in deep mining under pressure of the Xingdong Mine, the risk and prevention technology of the water inrush from 2129 working face floor are studied by means of field investigation, theoretical calculation, stress monitoring and microseismic monitoring. The results show that the risk of the floor water inrush caused by serious roof weighting is still high under the complex mining geological conditions of the 2129 working face; It can effectively reduce the floor failure depth by shortening the periodic weighting interval; and the roof hydraulic fracturing to prevent the floor water inrush is proposed; during the mining process of 2129 working face, the average of the periodic weighting step is 5.25 m, which is 76% less than that of the 2222 working face; the maximum periodic weighting dynamic load coefficient is 1.47; and microseismic events are mainly concentrated in the shallow strata of the floor, while the floor water inrush channel isn’t formed. The proposed prevention technology can effectively reduce the risk of water inrush from the floor, realizing safe mining in the island working face under high water pressure.

Abstract: Open-pit coal mine adopts single-dump electric shovel-dump truck-crushing station-strip conveyor semi-continuous process for coal mining production operation. The teeth of WK-35 electric shovel bucket are affected by coal and ore during work. The reaction force is easy to fall off, and the falling tooth together with the raw coal entering the crushing station will cause damage to the crusher, which will lead to the shutdown of the entire mining and crushing production line, causing significant economic losses. The tooth detection system designed in this paper is installed and used on the WK-35 coal mining shovel in Heidaigou Open-pit Coal Mine.It focuses on the development, composition and detection technology of the tooth detection system, and realizes the automatic integrity of the tooth. Identification and alarm.

According to cave collapses and passes straight through When the horizontal well and the vertical well is connected,which will block the gas production channel and will affect subsequent operations such as sand bailer, lower pump and workover, etc. The cave is rules,and not easy to collapse with 6 blade forging and milling tools and zxq-145 reaming tool; Drilling time is strictly controlled before and after connection, in order to avoid the caving caused by the disturbance of coal seam caused by bottom hole pressure fluctuation and drill string vibration. By eccentric connected theory analysis, on the basis of construction practice, optimizing drilling parameters, calculating the offset, borehole trajectory control, which effectively eliminate instrument error;There is implemented A set of CBM Horizontally- Remote intersected Well in Panzhuang block by near-bit rotating electromagnetic ranging guidance technology. The distance between the wellheads of the two Wells is 764m, and the eccentric connection is realized at the depth of 1099.37m. This technology is the further improvement of the horizontal well communication technology of coalbed methane.

In view of mining under the influence of the space distribution features of overburden rock fracture of mine water inrush disaster prevention and control and gas extraction is of great significance, in the concrete engineering background of pan coal mine 18111 working face, the similar physical simulation, numerical simulation and theory analysis of the three methods, studied the distribution of strata cranny of fully mechanized working face evolution regularity and conductivity fracture height.The results show that, with the continuous advance of the working face, there are fracture accumulation zones at both ends of the working face.Based on the statistical analysis of fracture development Angle by numerical simulation and the results of similar simulation tests, it is concluded that the fracture development Angle of overlying rock presents the characteristics of regional distribution.A variety of methods were used to study the height of fracture development. Through a comprehensive analysis of the obtained results, it was concluded that the height of water-conducting fracture development was 54~60.8m.The results can be used for reference in the study of fracture evolution characteristics under similar engineering conditions.

Abstract：During the process of groundwater circulation, hydrochemical characteristics are closely related to hydrodynamic conditions, and the dissolved chemical components will move with the movement of groundwater. Based on the water quality data of the coal seam floor in the penal 2401 area of Shunhe Coal Mine, we analyzed the hydrochemical characteristics in the study area using Piper diagram，Gibbs diagram，and ion ratio analysis method．The water release test verified that the analysis results were in good agreement with the actual situation. Therefore, it is feasible to judge the hydrodynamic conditions of the Taiyuan limestone aquifer using conventional groundwater chemical characteristics

The formation and expansion of hard rock fissures is an important part of studying the mechanism of rock damage. In order to explore the expansion law of rock fissure which provided a theoretical basis for microwave-assisted rock breaking technology under microwave irradiation, scanning electron microscopy (SEM) equipment that can help to analysis the shape of the fracture, the type of fracture and the fracture model is a is used to scan the granite specimens after microwave irradiation and uniaxial compressive strength test. The results show that the color change of the surface of the test piece is accompanied by tensile cracking after high-power microwave irradiation. The upper part of the test piece is broken in powder form after the compression test. The morphology of the fracture surface of the granite is mainly flat under SEM equipment. Surface and stripe fractures; the crack types of granite are mainly tensile cracks and compression shear cracks; the fracture models of granite are mainly intergranular fractures, transgranular fractures and superposition of the two.

In order to study the flocculation and sedimentation characteristics and mechanism of different types of polyacrylamide on fine quartz particles, the flocculation and sedimentation test of fine quartz particles suspension with different types of polyacrylamide was carried out, and the effect of dosage of medicament, pH value, pulp concentration, energy input and other factors on the flocculation and sedimentation characteristics of fine quartz particles were investigated. The result showed that the influence of different types of polyacrylamide on the settlement characteristics of fine quartz particles is: cationic > nonionic > anionic. The effect of nonionic type was better at 8 million, and that of anionic type and cationic type was better at 12 million. As the dosage of cationic was 300g/t, pH=5, pulp concentration was 40g/L, the sedimentation efficiency was up to 99.4% and the turbidity value was 8.070. The main modes of action between polyacrylamide and fine quartz particles were "electrical neutralization", "adsorption bridging flocculation" and “enmeshment ability”.

In order to study of the behavior characteristics of bubbles, the paper employed the bubbles generated in the terpineol liquid phase at different concentration to study the influence on the bubble diameter, distribution of bubble diameter, the roundness of bubble, the velocity of bubble. The experimental results show that the polarized distribution of bubble diameter is more obviously with the increase of terpineol concentration; and that the bubble cyclic velocity variation is in the range from 0.3m/s to 0.55m/s.

Taking Fugu semi-coke powder as raw material, the upper limit of the particle size of the raw material is 3 mm, the content of <1 mm is 70%, the molding moisture is 25%, and the gasification briquette molding test is carried out under the molding pressure of 25 MPa. Taking the compressive strength and thermal stability of the briquette products as the evaluation index, the binder selection and dosage of the semi-coke powder to prepare the gasified briquette were investigated. The test results show that the briquette made of 2.00% starch, 6.00% bentonite, 4% coking coal powder or 1.00% CMC, 4.00% bentonite and 4% coking coal powder has higher compressive strength and thermal stability, but also has good economic benefits.

To explore the effect of oxide composition on coal ash fusion characteristics, the oxide content in coal ash was selected as independent variables. On the platform of SPSS software, full subset regression and stepwise regression were carried out on deformation temperature DT, softening temperature ST, hemispheric temperature HT and flow temperature FT, respectively. The newly defined fusion index FI and the optimal regression prediction equation were obtained. The results show that the single oxide component has no significant effect on the ash melting temperature. The melt index with the most significant effect on DT is FID=Al2O3+Fe2O3, and when the FID content in coal ash is less than 30%, DT hardly changes, and when the content is greater than 30%, DT decreases greatly. The melt index with the most significant effect on FT is FIF=SiO2+Al2O3+Fe2O3, and as the FIF content increases, the flow temperature shows an upward trend. The melt index FIH=SiO2+Al2O3 which has the most significant influence on the hemispheric temperature HT, and the melt index FIS=SiO2+Al2O3+Fe2O3 which has the most significant influence on the softening temperature ST, but the significance of FIH and FIS on ST and HT is slightly lower. For a more accurate prediction model, the prediction equations of ST and HT are obtained by stepwise regression method analysis starting with ten oxides.

Aiming at the problem of edge extraction and vibration detection of steel wire rope image in coal mine hoisting system, the edge extraction algorithm and vibration detection method of steel wire rope are improved. Firstly, the gray-scale image of the steel wire rope in the suspended rope section is collected by the camera, and the region of interest (ROI) is set. Then, the ROI is binarized by the Matlab image processing program, combined with Sobel algorithm and the rational use of mathematical morphology theory. Then the camera calibration is used to obtain the internal and external parameters of the camera. The world coordinate system and camera coordinate system are reasonably set. Coordinate conversion and matrix operation are carried out to directly obtain the world coordinates of the string rope. Finally, the real-time detection of the string rope vibration displacement is realized by nesting Labview and Matlab programs. The experimental verification shows that the improved method can quickly and accurately realize the edge extraction of wire rope and non-contact vibration detection of wire rope, and has better research significance and application value.

:In order to reduce the maintenance risk and maintenance cost of coal enterprises, this paper proposes a multi-objective decision-making optimization model considering coal mine maintenance safety and maintenance cost. Firstly, the Weibull distribution is used to simulate the deterioration trend of each equipment, and then the equipment maintenance and management are Influencing factors Establish an unsafe coupling model for coal mine equipment maintenance, and establish a minimum maintenance cost model with the goal of minimum maintenance cost and minimum downtime loss. Finally, the improved genetic algorithm of crossover operator POX based on maintenance sequence coding is used to solve the maintenance scheduling of coal mine comprehensive mining equipment group. The results show that the target function value of the first maintenance and dispatching is reduced by 30.68%, and the maintenance of three working faces is completed. The cost rate has been reduced by 40.52%. Therefore, this method can develop a reasonable scheduling decision plan for coal enterprises, reduce the maintenance cost of coal mine enterprises, and improve the safety performance of coal mine equipment operation.

The development status of pure electric explosion-proof vehicles for mining is described from three aspects: application status, industry standard status and technology status. The development of key technology of pure electric explosion-proof vehicle is introduced in detail, an overview of pure electric explosion-proof vehicle for mine, explosion-proof power drive motor, explosion-proof power battery and control system is revealed. Along with the support of relevant national policy, the introduction of various industry standards, and breakthrough of key technology of mining electric explosion-proof vehicle, pure electric vehicles can effectively improve the underground working environment and realize the energy conservation and emissions reduction, will be the future development direction of underground trackless auxiliary transportation technology and equipment, and has a good market prospect in the later period.

In view of the high-frequency brakes of mine explosion-proof vehicles in long-distance and large-slope conditions, the braking process has insufficient braking force, slow response, and high risk of vehicle stall. This paper is based on intelligent detection and electro-hydraulic control. The technology designed a set of mining vehicle intelligent steady speed combined braking system and took the 8° ramp as an example for parameter design and verification test. The test results show that the system can effectively control the running speed of the vehicle at a safe driving speed when the full-load vehicle is descending on the 8° ramp, effectively avoiding the high-frequency sub-brake braking during the downhill process of the vehicle, and the combined vehicle driving brake. Eliminate the occurrence of vehicle ramp stalls, improve the life safety of mine vehicle drivers, reduce vehicle failure rate, and improve coal mine production efficiency.

　　In order to give full play to the maximum efficiency of trackless auxiliary transportation and guide the designers and purchasers to select the right type of trackless rubber tyred transportation equipment, this paper, based on AQ1064-2008 "code for safe use of trackless rubber tyred vehicles with explosion-proof diesel engines for coal mines" and 2016 "safety regulations for coal mines", and with reference to the performance parameters of the mainstream trackless rubber tyred transportation equipment in the current market, expounds it from a systematic perspective The parameters of roadway section, roadway surface and ramp conditions, design dimensions of various chambers, ventilation requirements and other relevant parameters involved in trackless auxiliary transportation are provided, which provides a reference for the design of trackless auxiliary transportation and trackless transformation of tunnels and chambers.Finally, based on the actual condition data of a mine, the paper discusses the selection process of trackless rubber tyred vehicle in detail, which provides a theoretical basis for the selection of trackless rubber tyred equipment.

The unique resource endowment conditions determine the position of coal in China's energy consumption structure, and coal will become the main energy source of primary energy in China for a long time.However, the transformation of economic development mode, the transformation and upgrading of consumption structure and production structure, and the constraints of environmental climate change have forced China to put the reform of coal industry reform on the agenda.The National Strategic Plan for Energy Development (2014-2020) emphasizes that the proportion of China's coal consumption in 2020 is controlled within 62%;The “13th Five-Year Plan” proposes to build a new energy system to achieve clean and low-carbon production of energy, safe and efficient targets;At this stage, the guidelines for the de-capacity policy are proposed, which guides the future development direction of China's coal industry.Through the analysis of China's economic development and the status quo of excess capacity of coal industry and the problems that need to be grasped in the context of de-capacity policy, it proposes strategies and policy recommendations for the development of China's coal industry.

This paper Uses the relevant data of 2013-2018, inspects the coal industry with the method of canonical correlation analysis of the relationship between social responsibility and corporate value. Results show that the coal industry listed companies highly related to the enterprise value and social responsibility, and should enhance shareholder returns, guarantee the delinquency, protecting the legal rights and interests of consumers and employees, to achieve the mutual promotion between the two, and finally to the coal industry and provides the theory basis for relevant enterprises social responsibility in the face, and give the related Suggestions.