In order to study the exploitation design of the mine with a depth of 1000 meters in the thick surface soil layer, and constantly improve the design level, the exploitation system is reasonable, technically advanced and feasible, economically reasonable from the design source, so as to realize the safety, high efficiency and high yield of the modern mine. After analyzing the geological characteristics of Kouzidong mine field, which is characterized by thick topsoil, high ground pressure and deep burial, the exploration design of Kouzidong mine was studied. The research results have certain guiding significance and reference value for the design of similar type mines with thick topsoil, high ground pressure and large buried depth.

In order to solve the problem of lack of three-dimensional geological modeling function in the process of BIM design of coal engineering based on one platform. Improve the designer's understanding of the traditional geological report, reduce the loss and distortion of spatial information, and realize the integration of all kinds of geological information under one model. A standard and convenient 3D modeling technology of coalfield geology based on MicroStation platform is proposed。

Aiming at the shortcomings of "Reverse design" in coal preparation plant，this paper shares the research on coal preparation plant top-down design with BIM，gives out the flow of top-down design with BIM, the process of implementation and the method of model creation，finds out the acclimatization problem of Dassault 3DE system，explores preliminarily the method of coal preparation plant top-down design with BIM. The research can Provide evidences and information for other units that want to conduct research on coal preparation plant top-down design with BIM.

In order to ensure the safe and effective evacuation and evacuation of underground coal mines in the event of an accident, and to ensure the safety of underground personnel, a mine underground emergency navigation system was designed. This system proposes a coal mine underground communication network framework, and a underground mobile terminal is designed for WIFI location data collection and voice navigation broadcast. The system was tested under the coal mine. The application results show that the positioning and navigation module is in good working condition, and the navigation error accuracy is controlled within 3m, which can meet the evacuation requirements of the personnel in the coal mine.

Aiming at Zhaogu Erkuang Coal Preparation Plant’s problem of the lump middlings over-standard ratio in lump coal, through the process comparison, chosed to use the heavy medium shallow tank sorting process to transform.Completed a reasonable process design and equipment selection.In the equipment layout design, the limited space is fully utilized and the optimal design is optimized, which realizes the flexible and organic connection between the new system and the original system.After the completion of the project transformation, the average median ratio of lump coal decreased to about 2.50%, meeting the product quality requirements, and achieved good economic benefits.It provides a good demonstration for other jigging coal preparation plants in the Jiaozuo mining area in terms of reducing the lump middlings content of lump coal.

Abstract: Foundations of pile or CFG pile composite foundations for high-rise buildings in Xi'an are used widely. In some areas of the Weihe terraces, there are thick dense sand layers with good engineering performance.In this paper, an 100m building with frame tube structure in Xi'an is introduced.The analysis foundation scheme, in-situ static load test, determination of foundation bearing capacity, calculation of weak underlayer, calculation of foundation deformation are conduceted; The measures such as adjusting the size of the external raft of the foundation raft, rationally dividing the post-settling zone of the raft, and making the center of gravity of the building and the centroid of the raft foundation plane basically coincide are adoted; Combined with the analysis of the settlement observation data during the two years after the structure was capped,The feasibility of shceme for high-rise frame-tube structure to use fine sand layer as natural foundation has been proved.

In view of small coal pillar size of roadway driving along next goaf at full mechanized sublevel caving face directly decides the stability of roadway and coal recovery rate. Fully mechanized sublevel caving face 8800 of Nanyangpo coal mine was set as the research background, the combining research method of theoretical analysis, similar experiments and field observation was used to study reasonable size of small coal pillar next goaf in roadway driving along next goaf. Based on key strata theory, a mechanical model of key rock articulated structure in roof of coal pillar was established, and the bearing stress of the coal pillar was derived mathematically. According to the linear calculation method of coal pillar strength proposed by Bieniawski, the width of small coal pillar in roadway driving along next goaf was determined to be 7m. Similar experiment was applied to simulate surrounding rock stability of 7m small coal pillar in roadway driving along next goaf, and field observation test of the roadway surface displacement was carried out. The both results were satisfactory, which verified the feasibility of setting 7m small coal pillar in roadway driving along next goaf of fully mechanized sublevel caving face 8800. It provides important reference and reference for the size determination of small coal pillar in roadway driving along next goaf of similar mining condition.

In order to study the rock burst risk caused by the disturbance of multiple coal pillars in full-mechanized caving mining, the stress disturbance calculation models of lateral section coal pillar, overlying remnant coal pillar and the coal pillar of stopping line were built respectively by using the limit equilibrium theory and stress disturbance angle, which were based on the actual distribution of coal pillars of 9203 working face in Danshuigou mine. The disturbance dangerous areas of the different coal pillars were obtained. And the control and early warning technologies of rock burst under the disturbance of multi-pillars were provided, which mainly included the pressure relief technology of boreholes and the monitoring technology of the coal stresses, micro-seismic events and drilling cuttings inspection. The results show that the disturbance dangerous areas of lateral section coal pillar, overlying remnant coal pillar, the coal pillar of overlying and lateral stopping line are respectively the areas from the roadway’s sides to the 7.2m deeper, from the lateral section coal pillar to the 39.8m deeper of working face end along the dip direction of working face, from the overlying stopping line to the 47m deeper of gob, and the areas of the lateral section coal pillar and working face end form the start points of the lateral stopping line to the stopping line of mining working face. After the control and early warning technologies applied, there were no the early warning of stresses and micro-seismic events in the field, and it had a good application effect.

in order to increase the permeability of the coal seam, improve the gas drainage efficiency of the coal seam, and ensure the safety production of the working face, the ultra-high pressure hydraulic fracturing scheme of n3704 siwasi roadway (under) crossing layer was studied and designed, and the fracturing effect was preliminarily investigated. The results show that through the coalbed fracturing in No.7 coal seam, the pure gas drainage efficiency after fracturing is increased by more than 10 times, the coal seam is changed from difficult to drainage coal seam and drainage coal seam to easy drainage coal seam, and the coal seam permeability coefficient is increased by more than 50 times; at the same time, under the condition of 750m buried depth and water volume of 109.72m3, the drainage radius after fracturing can reach 50~70m, which is improved Gas drainage efficiency can improve the passive situation which is not conducive to production due to gas restriction.

Aiming at the problem of gas prevention and control in the mining of short distance coal seam group in Shaqu mine, the paper comprehensively uses the method of theoretical analysis and numerical simulation to analyze the effect of floor pressure relief during the mining of protective layer, and compiles fish language in combination with the development form of plastic zone to obtain the variation law of permeability coefficient in the protected layer, which is used in engineering practice. The results show that when No.2 coal seam is mined as the protective layer, the pressure relief depth of the floor can reach 20-36m, which is greater than the maximum vertical distance between No.3 + 4 coal seam and No.3 coal seam, and No.3 + 4 coal seam is within the protective range of the upper coal seam. With the exploitation of the protective layer, the permeability coefficient of the protected layer is significantly increased, and the maximum value can reach 5.2. Although the permeability coefficient will fall down with the advancing of the working face, it is still greatly improved compared with the initial value. In the mining of No.2 coal seam, the gas concentration in the bottom through layer drilling is measured. The maximum gas concentration in the drilling hole can reach 70%, and the extraction effect is good.

Air leakage of surface in gob of shallow coal seam working face is one of the main reasons leading to spontaneous combustion of residual coal in gob. In this study, the gob of 22310 working face of Bulianta Coal Mine was taken as the research object, the dynamic test of the surface effective air leakage range of gob in working face with exhaust ventilation was carried out by using the dual-element tracing technology and the actual mining speed of the working face. Research results showed that the effective air leakage range corresponding to the gob of the working face is 0~123-137 m along the working face strike. Moreover, the air leakage volume on the return side of gob is larger than that on the intake side. Through calculation and comparison, the closer to the working surface, the greater the wind speed of the air leakage in the gob. The research has a certain guiding role in preventing spontaneous combustion of residual coal in gob in similar working face.

Pollution sources of hydraulic powered support in coal mine and their harms were thoroughly analyzed.Through research on blockage of high-pressure filtering apparatus of hydraulic powered support system in Huang Yuchuan coal mine 226 working face, analysis of the macroscopic feature of whole filter core, the elemental analysis and the dissolution of pollution ,and the quality analysis of the water for preparing emulsion were carried out. The results showed that, the outside pollution of filter core were rubber particles and pulverized coals, and the inside mainly were iron rust, metal residues,metal corrosion products and small amount of sediments; mass contents of Fe, Al and Ca were respectively 74.868%,10.218% and 4.581%.

The overburden structure and the law of strata behavior in working face are strongly influenced by the coal seam occurrence conditions. Using theoretical analysis ,similar simulation and field measurement, the structural characteristics of overburden and the laws of strata behavior in fully mechanized caving face under the condition of shallow depth and thick bedrock were studied. The results show that the lower tangential tensile strength results in the layered collapse of the thick basic roof. The displacement space and collapse shape of the high and low layers are obviously different. The hydraulic support mainly bears the weight load of rock mass within the height range of the caving zone, and then determines the working resistance of the support based on that. Finally, the correctness of the theoretical analysis is verified by the field measurement of strata behavior law. The research results provide an important basis for the support selection and rock pressure control of working face under similar geological conditions.

For the characteristics that the overburden of the stope in some districts has thick and hard rock formation, the blockness of broken rock mass is big, resulting in the distortion of the result of the breaking span calculation formula. By considering various factors such as interaction of the rocks and the support parameters, using combined deformation in material mechanics, the thick and hard rock formation period breaking span mechanical model is established, the period breaking span calculation formula is obtained, the derivation formula is proved by the on-site measurement data and compared with the traditional boom-type breaking span calculation formula.The research result shows that as the thickness of the rock formation increases, the deviation of the result of the traditional calculation formula to the actual value is increasingly apparent, while the result of the derived span calculation formula well coincides with the actual value. Therefore, the derivation formula has higher reliability and reasonability. The factors influencing the period breaking span of the rock beam are: thickness of the rock formation, tensile strength, sinking amount of the broken rock mass, carrying load, support force transferred to the fundamental roof, and contact length of the non-broken rock beam between the direct roof and the fundamental roof. The thickness of the rock formation, the tensile strength and the carrying load are main factors. The breaking span increases along with the increase of the thickness of the rock formation and the tensile strength; and moreover, as the thickness of the rock formation increases and the breaking span increases, the formed lumpiness after the breaking increases. The rotating sinking amount of the broken rock mass has little influence on the breaking span; and the carrying load is in a negative correlation with the breaking span. When the load value is small, the influence on the breaking span is large. When the support parameters R and p increase, the breaking span increases but increasing amplitude is limited, which indicates that the support cannot effectively postpone the occurrence time of the fundamental roof or cannot prevent the rotating sinking.

With the engineering background of working face of a mine whose mining depth is more than 1,000 meters and in which fault coal pillars with different widths exist, the tectonic stress of faults and the influence of migration of coal pillars and overlying rocks of the mining working face adjacent to the fault on the impact ground pressure were analyzed, so as to study the mechanism of induction of the impact ground pressure by fault coal pillars with different widths. The study showed that the reason of the impact ground pressure was that the tectonic stress of faults and the stress of hanging overlying rocks above the coal seam exceeded the synthetical strength of fault coal pillars with different widths. By constructing the tectonic stress model of faults, the load model of hanging overlying rocks and the bearing model of fault coal pillars with different widths, the mechanical discriminant showing whether fault coal pillars with different widths could have impact was deduced, which could be used to accurately define the impact hazard area in the fault coal pillar area and provide basis for the taking of targeted measures in advance. The field practice has been made on the research achievements and the safe mining of the working face has been realized.

In order to grasp the deformation law of roadway surrounding rock under the impact of deep burial hard and extra-thick coal seam, and provide a basis for the prevention and control of deep rock burst in deep mines, the impacted ground was studied using theoretical analysis, FLAC3D numerical simulation and field test. The impact deformation failure mechanism and failure law of surrounding rock in the return airway of Hujiahe Coal Mine 402102 face affected by rock burst were studied. The research results show that the deformation of the surrounding rock will increase sharply after the mining disturbance reaches a certain level under deep conditions. The closer to the working face, the greater the trend of deformation change. The deformation of roof surrounding rock tends to be gentle due to the effect of advanced support, and the largest surrounding rock The displacement is up to 180mm. When it is within 45m ~ 55m from the front of the working face, the mining impact and the deformation of the surrounding rock is obvious. It is mainly manifested as the deformation of the surrounding rock on the roof and coal pillars, and the destruction depth of the plastic zone of the roof surrounding rock is more than 3m.

Abstract: Taking the return wind trough of the 132203 working face of Anshan Coal Mine as the research object, this paper probes into the phenomenon of the broken roof in the early stage of tunneling, obtains the loose ring range of the surrounding rock, calculates the development height of the plastic zone of the roadway roof by using the equivalent circle method. based on this, a new support scheme is proposed. the new support scheme is used in engineering practice, and the deformation of the roadway and the stress condition of the bolt under the two support parameters are observed. the observation results show that the new support scheme is more conducive to maintaining the stability of the roadway.

In order to discrimina water inrush source of coal mine, 61 groups of non-polluted water samples had been gained by inverted cone water intake device from 3 aquifers in 4 coal area. And the water samples had been mensurated about routine water quality and 44 trace elements. The measurement results had been analyzed by relevance and key indicators were proposed, as well as 3 discrimination models. The results show that inverted cone water intake device can get non polluted water samples efficiently. 6 routine water quality and 14 trace elements are key indicators of water inrush source discrimination in study area coal mine. And water source discrimination Bayes model about characteristic trace elements corrected by conventional ion is more accurate than the others. Its accuracy of verification is 92.9%. The study provides a new direction about water source accurate discrimination of coal mine.

Most of the slopes of open pit mines are finite slopes. The length of slopes is generally less than 200m. It is difficult to accurately evaluate slope stability by traditional two-dimensional slope analysis method. For the near-horizontal open pit mine, the end gang is a typical finite slope excavation-backfilling process. According to the characteristics of open-pit coal mine slope, the dynamic development law of pressure arch is revealed. The finite slope combined pressure arch model is established. The criterion of combined support arch instability is given. Through numerical simulation, the results show that the slope stress is toward mining. The center of the groove is unloaded, which is characterized by a time-sensitive asymmetric "pressure arch" shape. The timely follow-up of the inner tube can improve the stability of the end slope. The main mechanism is that the inner step provides effective support and prevents the end. The creep development of the slope limits the unloading space of the ground stress, buryes the position of the slope with large deformation, and transfers the stress concentration area to the inner step surface.

Taking the Heidaigou open-pit coal mine as an example, this paper analyzes the energy consumption of related equipment in various production stages of open-pit mine based on field research and on-site testing. The research shows that the energy consumption in the transportation process of Heidaigou open-pit mine is the highest, accounting for 78.5% of the total energy consumption, most of which comes from diesel oil. Optimizing truck transportation routes and reducing truck waiting time are the most important ways to save energy in open-pit mines. The higher the annual transportation volume of trucks, the lower the annual average diesel fuel consumption; The energy consumption monitoring of large electric shovel is necessary. Electric-driven mining and stripping equipment can replace oil with electricity and reduce energy consumption.

The electro-hydraulic control system of the fully-mechanized working face is the key carrier for the remote control of the three machines cooperating in the coal mine and the intelligent mining of few people (unmanned), and it has been included in the scope of management of safety signs of mining products, it is required to pass the compulsory certification before it can be used in the work face. This article summarizes the current status of domestic and international testing of electro-hydraulic control systems in fully mechanized mining faces, starting from the reality that the ability of testing lags behind the technical development of electro-hydraulic control system products, putting forward the construction ideas and schemes of the three major testing systems for the electro-hydraulic control system cover the testing of the safety performance, clean filtering performance, and shock response performance of the electro-hydraulic control system. It solves the problems of testing capabilities of the electro-hydraulic control system, such as the overall anti-interference, data transmission stability, control software reliability, etc. On this basis, the development trend of the testing about the electro-hydraulic control system is analyzed from the perspective of the future technology development of the industry.

The new generation of high-frequency isolated cascaded medium and high voltage inverters eliminated the traditional power frequency transformer, reduced the number of fully controlled switching devices, and increased the power density of the system. In practice, it often faced with problems such as load imbalances and power grid imbalances. A new structure of rectifier-inverter double star staggered connection and isolation stage converter with multi-winding common iron core transformer was proposed. From the perspective of system coordinated control, this structure solved the problem of unbalanced DC voltage caused by unbalanced conditions and realized fault isolation. The power transmission characteristics of the topology were analyzed in detail. Finally, simulations were conducted to verify the feasibility of the proposed structure.

In order to ensure the safety of wire rope operation, it is necessary to conduct periodic nondestructive testing of wire rope. Among the existing testing methods of steel wire rope, the electromagnetic testing method based on magnetic flux leakage principle is recognized as the most practical testing method. Maxwell 3D is adopted in this paper to simulate magnetic field signals, through adjusting the magnetic field intensity, magnetic distance and lift value, verifying the circular array detection method, finally conducting dynamic simulation on the magnetic flux leakage of steel wire rope, and recording the magnetic flux leakage signals in the whole process of movement. In the process of simulation, the appropriate test parameters are determined, so as to provide data reference for the design of the second generation of wire rope flaw detector.

In view of the problems of the current supervision and supervision, such as artificial on-site law enforcement, backward supervision means, time-space discontinuity in the process of evidence collection, and subjective experience evaluation, this paper studies the mobile law enforcement technology and equipment driven by situational awareness, builds a mobile law enforcement system with synchronous and reliable information, and provides technical support for the objective, fair and compliant supervision and supervision Effectively regulate the discretion of law enforcement personnel, improve the fairness of law enforcement results, and achieve accurate law enforcement.

In the light of the problems of large water flow, non-uniform and difficult separation of the coal slime in the underground working face of the coal mine, a concentrated type cyclone with a concentration hopper is studied, and the influence of the concentration-type cyclone on the solid performance of the concentrated cyclone is investigated. The results show that the best combination parameter is 0.14MPa, the diameter of the bottom flow port is 15mm, the diameter of the concentrated bucket is 21mm, the bottom flow concentration is 47.61%, and the bottom abortion rate is 42.19%. The best parameter is the feed pressure of 0.12 under the evaluation index of the bottom abortion rate. The bottom flow concentration is 40.52% and the bottom abortion rate is 46.78% in the MPa, bottom outlet diameter 18 mm, concentration bucket caliber 27 mm, mine water test. According to the dimensionless relationship, the industrial operation test of cyclone amplification is carried out. The swirl concentration equipment can effectively reduce the water content of mine water, and the concentration of slime can reach nearly 70%.

In order to develop dry desulfurization and low-temperature denitrification technology for coking flue gas, effects of air speed, temperature, ammonia nitrogen ratio and humidity on the denitrification performance of commercial active coke were studied. The structure of reactor was designed, and reactor size was calculated by calculation model. The results show that the suitable process parameters for denitrification of activated coke as following: space velocity 300 h-1, reaction temperature 140 ℃, ammonia nitrogen ratio is 1.3, flue gas humidity no more than 16%. Aiming at improving desulfurization and denitrification efficiency of activated coke reactor, the structure of reactor is left-right parallel and cross flow moving bed reactor. Take flue gas of coking plant example, activated coke desulfurization and denitration reactor with capacity of 150000 Nm3/h is designed with size of 8 m×33 m×4 m.

China is rich in thin seam resources. With the continuous mining of thick and medium-thick coal seam resources, thin coal seam mining has become an inevitable choice. Drum shearer is widely used in thin seam mining because of its strong adaptability and stable performance. The development status of thin coal seam drum shearer was introduced. The advantages and disadvantages of thin and thinner coal seam shearers of major manufacturers at home and abroad were briefly analyzed. It was pointed out that low-height and high-power are the main development direction of thin coal seam shearers. With the increasing power, the key technical problems faced by thin seam shearers in the development process were presented, including the layout of the whole shearer, the design of high power density rocking arm, the research of high speed and high reliability traction walking system, the design of compact electronic control system, the design of coal loading effect and the problem of towing cable, and the solutions are given separately. This paper can provide reference for the design of high-power thin seam shearer in the future.

In view of the development and application requirements of high-power intelligent coal mining machine, the new hydraulic lifting system of coal mining machine is developed. This paper introduces the principle of the project in detail, gives the calculation process and results of the system parameters, and expounds the The structure and function characteristics of the system, completed 3D modeling of the system structure,and the performance advantages of the new system are summarized compared with the conventional hydraulic system, which provides ideas and methods for the design and improvement of the hydraulic system of the shearer in the automatic working face.

In order to study the influencing factors of TQM system in coal enterprises under the background of high-quality development, Shenmu Hongliulin Mining Co., Ltd. of Shaanxi Coal Group was taken as the research object, and relevant data were obtained through literature research, field research and expert interviews, The influencing factors set of TQM system is constructed from four dimensions of strategic innovation management, production safety management, coal quality management and administration. The Interpretive Structure Model is used to analyze the 20 influencing factors, and a multilevel hierarchical digraph is drawn, The hierarchical relationship among the factors is analyzed according to the hierarchical results displayed in the interpretive structure model. The paper puts forward constructive suggestions on the improvement of TQM system in coal enterprises, and promotes the high-quality development of coal industry.

The market structure of China's coal industry has the characteristics of gradually increasing industrial concentration, differences in enterprise size, weak product differentiation, and high barriers to entry and exit the industry. It cannot be simply classified as a single type of market structure in Economics. Its long-term contract trading and short-term contract trading are characterized by oligopoly and monopoly competition, respectively. Market structure is closely related to corporate behavior. In the process of transformation and upgrading to achieve high-quality development, coal enterprises should determine their appropriate competition strategies,based on the realization of the different characteristics represented by long-term contract trading and short-term contract trading ,and also of their market positions in the industry.