In view of the large output of gangue in Shendong high-strength mining, and the limitations of existing gangue utilization and disposal methods, resulting in insufficient digestion capacity of gangue, a large-scale utilization mode of coal gangue in Shendong high-strength mining was proposed. The production and actual production conditions of coal gangue in Shendong mines, the actual situation of Shendong mining area and the distribution of surrounding industries, and the utilization ways of coal gangue in each mine were analyzed. The processing capacity, technical advantages and disadvantages of coal gangue utilization methods such as coal gangue power generation, coal gangue paving, coal gangue brick, sand and ceramsite, and coal gangue filling were summarized. The large-scale utilization mode of coal gangue in Shendong mining area was constructed. That is to give priority to the needs of local and surrounding industries to realize the resource utilization of part of coal gangue on the ground. Combined with the recovery coal pillar and disaster management of the mine, the gangue filling mining consumes most of the remaining gangue, and the application of filling mining shall not affect the mine yield. At the same time, the filling method is appropriately optimized, and the “ one mine, one policy ” is accurately implemented. The classification and precision filling mode of Shendong underground is formed, such as strip cemented paste filling, fully mechanized paste filling, grouting filling, solid filling, “ mining-concentration-filling ” integration filling and multi-mode comprehensive filling. This ' ground resource utilization + underground precise filling ' gangue large-scale utilization mode can maximize economic benefits and gangue disposal and disaster management benefits. The study can provide guidance for large-scale utilization of coal gangue in high strength mining area.

The reconstruction and expansion of Wangwa coal mine is to expand to 6.0Mt/a on the basis of the original 1.50Mt/a design production capacity. The reconstruction and expansion follows the principle of people-oriented, simplicity and efficiency. By simplifying the ground layout, optimizing the development layout, underground parking lot deployment, mining area roadway layout and mechanical equipment, optimizing the underground streamline design and other measures, the goal of simplicity and efficiency of the mine system has been achieved, with less investment and short construction period. It has laid a good foundation for the intelligent construction of the mine and the construction of green mine. The design and construction of the project have positive reference significance for similar reconstruction and expansion mines.

The isolated coal body is affected by the pressure transfer of the overlying high roof in the surrounding goaf, and there is a high level of static load concentration, and the impact risk is significantly increased after the mining disturbance. Aiming at the high impact risk of an extra-thick isolated coal body roadway in a rockburst mine in Shandong, the engineering analogy method was applied to analyze, and it was concluded that the current size of the isolated coal pillar was not enough to isolate the influence of mining disturbance. The stress state around the isolated coal pillar in the large roadway is analyzed, and the results show that the optimal size of the isolated coal pillar in the main roadway should be more than 200m. The blasting pressure relief measures are designed to reduce the impact risk caused by the superposition of dynamic and static loads. At the same time, the reinforcement support measures are designed to improve the bearing capacity of the roadway. The on-site industrial test shows that the control effect is good, ensuring that the extra-thick isolated coal mass is large during the final mining period of the working face. Alley's scour safety.

In order to reasonably and efficiently utilize the large amount of waste heat resources generated in the mine production of Xinjie Taigemiao mining area, so as to achieve the purpose of "energy saving, carbon reduction and environmental friendly", the available waste heat resources and the current situation of heating load are investigated and analyzed in the mining area. According to the conclusions of the investigation, a feasible scheme of multiple clean energy comprehensive utilization heating was proposed and established, and the investment benefit and environmental benefit of the comprehensive utilization scheme of waste heat and the traditional boiler heating scheme were compared and analyzed. The research results show that, compared with traditional boilers, the comprehensive utilization of waste heat can reduce investment and operation costs by nearly 14.84%, and greatly reduce the emission of pollutants, with significant environmental benefits.

At present, the number of projects using 3D BIM models in the coal industry is increasing. However, due to the lack of a unified and feasible industry information model standard, the modeling depths are different, the formats are different, and the data cannot be shared. After in-depth understanding of the research status of BIM standards at home and abroad and the existing national standards in the coal industry, this paper is based on a number of BIM standards and related frameworks for construction projects, the coal washing industry information model standards are divided into three directions: 3D design, 3D modeling, and 3D model interaction, And research from the aspects of professional classification, design scope, design depth, component resources, model engineering fineness, model attribute fineness, 3D model architecture, model storage structure, model hierarchy, etc., finally a set of relatively complete coal washing information model (CPIM) standards were formed. After the demonstration application of the whole life cycle management platform of Dahaize Coal Preparation Plant of China Coal Shanxi Yulin Energy and Chemical Co., Ltd., The application requirements have verified the feasibility and applicability of the standard in the business field of thermal coal washing in Daize Coal Preparation Plant.

In view of the restrictive conditions such as low work efficiency and harsh cleaning environment in railway loading stations, the application of vacuum cleaning technology in railway loading station is proposed.The full text introduces the vacuum cleaning technology, taking a loading station as an example, from the four aspects of equipment selection, system design, hydraulic check calculation and material recovery, the design process and key points are introduced in detail, and put forward the idea of next technology promotion.

Abstract:: In order to further standardize the verification of production capacity of open-pit coal mines in our country, on the basis of systemically combing the development course of the verification of production capacity of coal mines in our country, the 2021 of the measures for the management of coal mine production capacity and the standards for the verification of Coal Mine production capacity jointly issued by the four ministries and commissions of the People's Republic of China were analyzed, this paper puts forward that the main seven problems existing in the current verification standard of coal mine production capacity are as follows: the verification of new equipment capacity, the verification of outsourced equipment capacity, the mining spatial relationship, the matching of stripping mining, the matching of self-operation and outsourced mining, the Gross Coal Coefficient and the guarantee of equipment maintenance, etc. , in the light of the above-mentioned problems, suggestions for revision are given. At the same time, combined with the actual case of the coal mine production capacity verification of the Common 4 misunderstandings are analyzed in depth. To provide reference for the vast number of opencast coal mine production capacity verification personnel and further promote the standardization and scientific work of opencast coal mine production capacity verification in our country.

In order to study the deformation and failure law of the soft rock roadway under the influence of repeated mining in the fully mechanized top-coal caving face of thick coal seam, taking the 42203 fully mechanized top-coal caving face of Burtai Coal Mine as the engineering background, the deformation and failure characteristics and failure mechanism of the roadway under the influence of repeated mining in the 42203 auxiliary haulage roadway were studied by means of site survey, monitoring and numerical simulation, and the surrounding rock control technology of the soft rock roadway under the influence of repeated mining was proposed. The results show that the deformation of the two sides of the 42203 auxiliary haulage roadway is greater than the deformation of the top and bottom, and the strata behaviors violently, and the influence range of mining advance can reach 110m; Due to the change of roadway stress field caused by repeated mining, the plastic zone changed from approximately symmetric failure to asymmetric failure; The failure mechanism of repeated mining roadway is revealed, and the secondary reinforcement and support scheme for surrounding rock is proposed by using high-strength anchor cable. According to the field measurement, the scheme effectively slows down the deformation speed and total deformation of surrounding rock, meets the requirements of roadway stability, and has good effect, providing reference for the control of surrounding rock of repeated mining soft rock roadway.

The large deformation of deep soft rock roadway is always a difficult problem in support, and the stress environment is complicated due to the influence of tunneling and mining. In this paper, aiming at the large deformation problem of track dark inclined shaft in Xinyuan coal mine, the UDEC numerical model is established, and the parameters of the model are corrected by the laboratory test results and GSI method. In order to reveal the failure mechanism and deformation of roadway, the index of "stress weakening coefficient" is proposed to invert the deformation and fracture distribution characteristics of surrounding rock. The results show that shear fractures first appear at the corner and bottom of the roadway, then develop deep, tensile fractures appear behind shear fractures, and distribute in the shallow area of surrounding rock. The floor fractures are highly developed and seriously deformed. The combined support scheme of "full anchor cable + reverse bottom arch + net shotcrete" is proposed. The engineering application results indicate that the optimized supporting scheme can greatly improve the whole bearing capacity of surrounding rock and effectively control the deformation of roadway, which provides a useful reference for similar deep soft rock roadway support design.

Floor heave is a common problem for deep roadways, such as in mines, with sliding mode floor heave being particularly difficult to control. In this article, the large deformation of a roadway on the 850th level of the north wing of Yangdong mine was studied. The mechanism of sliding, which destroyed the roadway floor, was analyzed using a numerical simulation method and the use of concrete-filled steel tube piles of various support densities was proposed as an active anti-sliding solution. The experimental results showed that the high stress environment, high clay content of the mineral rock, and the accumulation of cracks and water were the main factors that lead to the rock easily disintegrating, allowing for a large deformation of the roadway. Concrete-filled steel tube piles prevented the formation of a slip surface and improved the strength of the sliding face. When the arrangement density of the anti-slip piles was increased, the floor heave of the roadway gradually dropped. The depth of the floor heave damage decreased and stabilized under certain arrangement densities. Interestingly, the force on each pile increased toward the center of the arrangement, which suggest that if the pile arrangement density is higher, the force on each pile will be lower, and the force on the piles in the middle, or inside of the roadway floor, will be larger than that of the piles on either side. The results indicated that the floor heave of the roadway can be effectively controlled, allowing normal mining operations to resume; this suggests that concrete filled steel tube piles are a suitable and promising method to control floor heave.

Abstract：The large coal pillar width and gas overrun in the upper corner of fully mechanized caving face have seriously affected the coal mining. In order to solve these two problems, taking No. 3205 working face of Yechuan Coal Mine as the research object, the roadside filling technology of gob-side entry retaining was studied by combining theoretical analysis, numerical simulation and field test. The mine pressure monitoring scheme of gob-side entry retaining was established, and the deformation characteristics of roadway surrounding rock and the strength of roadside filling body were analyzed. The results show that the width of filling body is 1.5m and the strength of filling body is 25MPa, which is the optimal choice of filling body parameters. When the working face advances 300m, the maximum deformation of the total height of the roadway is 0.5m, and the maximum deformation of the total width is 0.6m. At this time, the deformation of the roadway is stable, and the roadway operation effect is good, which can meet the requirements of the mine. This study provides a technical reference for mines with similar mining geological conditions and engineering problems.

Aiming at the problem of large deformation and difficult support of roadway caused by faults in driving face.By means of theoretical analysis, numerical simulation and field test, the deformation mechanism and control technology of surrounding rock passing through fault in heading face are studied.The stress environment of normal fault is analyzed theoretically.The stress and displacement of the fault passing roadway and normal roadway under different support schemes are simulated.Finally, the support scheme for the fault crossing of the heading face is given and applied to the engineering practice of Bu Ertai Mine.The "anchor + anchor cable + angle anchor" support scheme is used to strengthen the support strength and the addition of angle anchors can effectively control the surrounding rocks of the fault-excavation working face.

Aiming at the disaster problems such as support crushing and roadway crushing in the mining of working face under shallow buried residual coal pillar, the method of pre-splitting blasting residual coal pillar and relieving stress concentration and disaster reduction was proposed. Based on the geological production conditions of Fengjiata Coal Mine, the bearing characteristics and stress distribution characteristics of residual coal pillar were studied by combining theoretical analysis and numerical simulation. The influence mechanism of uncoupling coefficient, axial charge coefficient, blast hole layout and initiation mode on the cracking effect of residual coal pillar was analyzed, and the reasonable blasting parameters were determined. The results show that the blasting coal pillar can reduce the transfer effect of coal pillar on the upper coating load, thereby reducing the force on the lower coal seam support.

In order to solve the problem of gas overrun in the upper corner of the fully mechanized mining face of low gas mines in the northern area of Shendong mining area, a comprehensive treatment technology focusing on gas drainage is adopted, and the drainage processes of upper corner intubation drainage, goaf closed intubation drainage and goaf borehole buried pipe drainage are adopted, together with corresponding auxiliary control technologies, At the same time, the design of the gas drainage chamber and the layout of the pipeline are optimized and improved. By adopting the above technologies, the gas concentration in the return air corner is significantly reduced during the mining of the working face, and the gas extraction rate of the working face reaches 45 ~ 64%, which solves the problem of local accumulation and overrun of the gas in the return air corner during the mining of the working face, This paper introduces the gas control technology of fully mechanized mining face in Shendong mining area.

It is the mainstream trend of the coal industry to improve the management capacity and level of coal mine safety production and promote the safe and high-quality development of the coal industry. The deep integration of AI(artificial intelligence) technology and the coal industry provides new momentum for the coal industry. Based on the analysis of the application of AI intelligent technology, this paper puts forward the overall framework and realization objectives of AI intelligent identification system, establishes the overall solution of INTELLIGENT MINE AI intelligent identification, and designs an AI intelligent analysis platform. The platform, with AI technology as the core, is supported by machine deep learning mathematical model and alarm system. Through machine vision algorithm, real-time analysis of personnel behavior, equipment state, environmental state, non-standard operation and high-risk operation of multiple operation scenarios in coal mine shaft is made, forming software + server intelligent vision application mode. Through machine vision analysis and artificial auxiliary proofreading, the abnormal events can be accurately analyzed, intelligent early warning, real-time tracking, on-site stop and interlock linkage, which has realized the transformation from civil air defense to technical defense, and has guiding significance for improving the coal mine safety production guarantee capacity and exploring the construction of visual and intelligent remote safety management mode

In order to solve the problem of environmental pollution caused by underground acid mine water gushing to Yueyang River in Zibo, a combined process of lime neutralization/oxygenation aeration/coagulation sedimentation/multi-stage filtration for treating mine water is designed. And its technological process, design parameters and technological characteristics are introduced in the article. As the results of engineering practice show, when the levels of COD, NH3-N, SS, total Fe and Mn in inlet water are 46, 27, 24, 395 and 7 mg/L respectively, the levels of outlet water are 20, 2.3, 6, 0.4 and 0.3 mg/L respectively, the quality of mine water has been effectively improved. It can be seen that the combined treatment process has a good effect for the treatment of acid mine water.

In view of the problems of large coagulant dosage and poor coagulation and sedimentation effect of high suspended matter mine water treatment in a mine in Jizhong Energy Fengfeng Group, multiple coagulation and sedimentation processes were used to study the effects of coagulant type, flocculant type, coagulation times, coagulant（flocculant）dosage method and dosage, reaction speed and other factors on the removal of suspended matter in mine water. The results showed that the best coagulant was PAC, the best flocculant was CPAM, the coagulation times were twice, the best dosage method and dosage were 70mg/L PAC and 0.3mg/L PAM for once, 20mg/L PAC and 0.3mg/L PAM for the twice, the dosage of PAC was reduced by 25% compared with the conventional coagulation, the best speed is 210 r/min for fast stirring and 60 r/min for slow stirring. Engineering applications show that: the use of dual coagulation and sedimentation process to treat high suspended mine water, the removal of suspended solids and turbidity effect is significant, the effluent water quality is stable and up to standard, saving water resources and drug cost, with good economic and environmental benefits.

The development height of water flowing fractured zone in overlying strata of coal seam in the same mining area is different. If the multiple of mining height is used to determine the development height of water flowing fractured zone, there is a large deviation from the actual development height. In order to study the maximum development height of water flowing fractured zone in overburden strata, 2-2 coal seam in Xiaobaodang mining area is taken as the research object. Through theoretical analysis, similar material simulation experiment, case verification and other methods, on the basis of applying limit curvature to predict the development height of water flowing fractured zone, the distance between the upper strata of water flowing fractured zone and coal seam, subsidence coefficient, mining height and the maximum curvature deformation value of the upper strata of water flowing fractured zone are organically combined by means of probability integral method. The relationship between the development height of the upward fractures in the overlying strata with the maximum curvature deformation value of the upper strata of the water-conducting fracture zone as the key parameter and the relationship between the development depth of the downward fractures with the maximum horizontal tensile deformation value as the key parameter are given. On this basis, a theoretical prediction method for the development height of water flowing fractured zone based on probability integral method is given. The maximum development height of water flowing fractured zone in overlying strata of 2-2 coal seam mining in Xiaobaodang mining area is predicted by using this prediction method. The maximum development height is 160.1m, which is basically consistent with the field measurement of 152.01m ~ 175.57m. The research results can provide theoretical basis for realizing water-preserved mining under similar working conditions.

Due to the existence of double panel-pillar between 3-1103 working face and 3-1101 working face in Hongqinghe coal mine, the new auxiliary transportation roadway of 3-1103 working face is faced with high burst hazard, which poses a threat to safe production. Numerical simulation and statistics are carried out to investigate the mine pressure features of double panel-pillar area and the active control of burst hazard. Simulation results show that: (1) Panel-pillar area is of high stress concentration with 1# pillar and 2# pillar posing a threat to the abandoned old auxiliary roadway and the new auxiliary roadway respectively; (2) With the increase of 2# pillar, the stress in 1# pillar, 2# pillar and beside the new auxiliary transportation roadway decreases; The stress in coal mass beside the new auxiliary transportation roadway decreases faster than that beside the old auxiliary transportation roadway; (3) Seismic events induced by 3-1103 working face mainly accumulated in the pillar area; The seismic events with energy more than 104J were mainly 214 m in front of working face and within 35 m on average away from the pillar.

In this paper, based on the engineering background of frequent rockburst events in the " square " area of a mine, the distribution characteristics of static load, dynamic and static load quantitative superposition abutment pressure of the working face are analyzed, and the rockburst mechanism of the special area with strong bursting liability roof is obtained : the goaf of the working face exerts static load on the side of the wide coal pillar, so that the coal and rock mass in the affected area reaches the critical state of rockburst ; under the influence of a large amount of elastic energy released by the breaking of strong bursting liability roof, rock burst disaster occurs in coal rock under the critical state of impact. The targeted prevention and control measures of rock burst are put forward for coal body and strong bursting liability roof. The large diameter pressure relief drilling and coal seam water injection pressure relief measures for coal seam construction , and the blasting pre-splitting measures for strong bursting liability roof construction ensure the safe production of working face. The research results can provide reference for the safe production of mines under similar conditions.

When the shearer is working, there is a temperature difference between the high power density mechanical transmission system of the machine arm, The thermoelectric effect can be used to convert this part of the thermal energy into electrical energy to power the arm sensors. Based on the energy harvesting technology and the actual working conditions of the shearer and the temperature distribution characteristics of the arm, designs a thermoelectric power generation system, Improved the structure of the thermoelectric power generation sheet and the heat dissipation device, using the LTC3108 energy harvesting management chip to manage the collected energy and provide reliable electrical energy for the sensor. Finally, the performance of the thermoelectric power generation system in practical application is studied through experiments, and compared with the theoretical calculation results, the feasibility of the thermoelectric power generation system is proved, this provides a new idea for solving the power supply problem of the shearer sensor.

In view of the power quality problems caused by the massive access of non-linear loads in the power supply system of coal mines, and the defects of high cost and large size of the centralized power quality regulation devices widely used at present, this paper proposes a control method based on the parallel connection of VIENNA type rectifiers to realize static reactive power compensation in order to improve the power quality of the power supply system. This method effectively suppresses the input current over-zero distortion problem of VIENNA rectifiers in compensating reactive power, which in turn greatly improves the capability of such rectifiers in power quality management. Finally, the feasibility and effectiveness of the proposed method are verified by simulation.

Aiming at the problems that the traditional feature selection algorithm used for fault diagnosis of coal mine machinery bearing separates embedding learning and feature sorting, it cannot accurately select subsets that can represent high-dimensional data sets and the accuracy of fault diagnosis is not high. In this paper, a fault diagnosis method for coal mine machinery bearing based on joint embedding learning and sparse regression is proposed. The method first constructs an embedded learning model to learn the manifold structure of high-dimensional data. And then the ι_(2,1)-norm with group sparsity is introduced into the regression model to effectively eliminate the influence of redundant features; Furthermore, a feature selection framework is constructed jointly with embedding learning and sparse regression, and the essential features that can accurately characterize the original high-dimensional data are selected; Finally, the fault diagnosis of coal mine mechanical bearing is carried out by combining with K-nearest neighbor algorithm. The experimental results show that the proposed model significantly improves the fault diagnosis accuracy of coal mine mechanical bearings.

The goaf of coal mine is a key area for the prevention and control of coal spontaneous combustion fire, the current measures to block air leakage can not completely solve the problem of spontaneous combustion in the goaf, inert composite materials and inert gases are often used to fill and inert the goaf in the prevention and control of coal spontaneous combustion fire in the goaf of coal mine. This paper briefly analyzes the fire prevention and extinguishing mechanism of inert composite materials and inert gas, and studies and analyzes the practical application effect of fly ash grouting and liquid CO2 in the prevention and control of coal spontaneous combustion fire in 22101 water gushing goaf by using optical fiber temperature measurement and bundle tube gas measurement technology. The results show that in the goaf with large water inflow, the environmental adaptability of liquid CO2 is better than that of fly ash grouting, which can quickly diffuse and inert the proposed treatment area and interrupt the accelerated oxidation process of residual coal ; Before the formation of asphyxiating environment in goaf, the oxidation process of residual coal slows down but still continues. The analysis shows that the diffusion and retention of fly ash grouting under complex regional working conditions need to be further improved. Combined with liquid CO2, it has a better effect on the prevention and control of spontaneous combustion fire in water gushing goaf.

Aiming at the phenomenon of fire caused by oxidation and heating of residual coal in goaf, In this paper, The field measurement method is used to study the characteristics of O2, CO, CH4 concentrations and temperature changes in the goaf, Combined with the oxidation and temperature rise characteristics of residual coal, the ignition trend of goaf is predicted. The results show that: When the working face advances more than 80m, The coal body has been fully compacted, The reduction of oxygen concentration restricts the oxidation and heating reaction of residual coal, The goaf enters the asphyxiation zone and the CO concentration is stable at 18ppm; CH4 concentration showed a continuous growth trend with the advancing distance and gradually stabilized after a slight decrease. It decreases longitudinally from the middle of the working face to the roadway on both sides, and the maximum CH4 concentration is 1.15%; The peak temperature of each measuring point in the goaf lags behind. The peak temperature of the measuring point in the middle of the working face occurs earlier than the return air roadway and earlier than the inlet air roadway, and the maximum temperature does not exceed 21.2 ℃; The oxygen concentration index method is used to determine that the oxidation temperature rise zone is 42.8m, The minimum safe advancing speed of the working face is 0.658m/d, and there will be no spontaneous combustion of residual coal during mining. The relevant research has reference significance for the fire prevention and extinguishing design of similar working faces.

Based on the experiment theory and heat and mass transfer theory, large enthalpy difference cooling and dehumidification experiment system is designed, which will study different spray pressure, gas-water ratio, cooling effect and thermodynamic performance of large enthalpy difference device that can realize spray water face to face and from one side in spray water temperature. The results show that large enthalpy difference cooling device is strong in adaptability, which can meet the cooling demand of mining area with different thermal damage. The heat exchange coefficient and the heat exchange efficiency are calculated. The results show that the heat exchange efficiency and heat exchange coefficient of the counter spraying method are 0.952 and 0.998 respectively, while the heat exchange efficiency and heat exchange coefficient of the downstream spraying method are 0.936 and 0.978 respectively. Consequently, the cooling and dehumidification effect of counter spraying method is slightly better than that of downstream spraying method. And the empirical formula of heat exchange efficiency coefficient and heat contact coefficient of large enthalpy difference cooling device is obtained by fitting the experimental data, which can more accurately guide the design of cooling project of mining area in thermal damage mine and large enthalpy difference cooling device.

To address the limitations of the surface movement observation stations and InSAR technical means in mining subsidence monitoring, the airborne LiDAR (Light Detection and Ranging, LiDAR) is used to collect 3D point cloud data in the subsidence area and construct a surface subsidence digital elevation model (subsidence DEM) by multi-temporal point cloud to obtain the mobile deformation characteristics of the surface. However, the constructed subsidence DEM contains multiple noise sources that are complex and difficult to remove, which limits the application of this technique in mining subsidence monitoring. An airborne LiDAR point cloud direct comparison algorithm (Cloud to Cloud, C2C) is proposed for mine subsidence monitoring. A working face in Yushen mining area is used as the study area, and the level observation data is used as the reference data, and the subsidence DEM is compared with three mainstream point cloud interpolation algorithms to verify the feasibility and accuracy of the algorithm. The results show that the C2C algorithm can quickly obtain high-precision subsidence values, and its subsidence accuracy is better than the calculation results obtained by the point cloud interpolation algorithm, and the subsidence curve conforms to the general rule of mine subsidence. The algorithm can achieve centimeter-level accuracy, which provides a new reference solution for mine surface movement deformation monitoring and ecological environment restoration.

It is easy to reduce the service life and heating and cooling efficiency of ground source heat pump system by selecting the inappropriate type of ground heat exchanger. Taking two ground source heat pump projects in Xi'an as the engineering background, based on the constant heat flux line heat source model and the slope method, the influence of sand-clay proportion and pipe diameter on the heat transfer performance of double U-shaped buried tube heat exchanger(DUBTHE) was analyzed through field geotechnical thermal response test(TRT). The results show that the initial average temperature and comprehensive thermal conductivity of rock and soil are 17.70 ℃, 1.54 W/(m·K) and 18.83 ℃, 1.79 W/(m·K) respectively, the proportion of sand layer is 16.71 % and 45.99 %. The comprehensive thermal conductivity of geotechnical soil calculated by the weighting method is 1.15 to 1.25 times of that measured by TRT. When the percentage of sand layer in-creased from 16.71 % to 45.99 %, the initial average temperature and comprehensive thermal con-ductivity of the geotechnical soil increased by 6.38 % and 16.23 %. And with the increase of pipe diameter from 25 mm to 32 mm, the heat exchange per linear meter increased by 12.76 % and 35.61 % in summer and winter, respectively. When the proportion of sand layer is less than 45 % and the cooling and heating load of ground source heat pump system is close, DN25 DUBTHE should be adopted. when the proportion of sand layer is more than 45% and the heating load of ground source heat pump system is higher than the cooling load, DN32 DUBTHE should be adopt-ed. It can provide some reference significance for the design of ground source heat pump system under similar sand-clay proportion conditions.

Aiming at the construction technology of drilling and anchoring integrated anchor bolt, a control system of drilling and anchoring integrated anchor bolt drill is designed. According to the working principle of the drill anchor integrated anchor rod drill, the hardware composition scheme of the control system is designed. According to the construction process of drill anchor integrated bolt, the automatic control program is designed. The system uses PLC as the controller to judge the working state of the roof bolter through the pressure, which can realize the automatic construction of the hydraulic roof bolter. Aiming at the problem that the chip bit is easy to wear and break, a constant pressure control method based on PID algorithm is proposed. The field test results in coal mine show that the constant pressure control method has the smallest feed pressure fluctuation, the feed pressure variance is 0.18, and the average value is 3.3Mpa. The control system of drill anchor integrated roof bolter can realize the automatic operation of roof bolter and has high reliability and stability.