Grouting is the important measure of reinforcing soft rock and plugging water-containing strata, directional drilling grouting technology China's coal mine has been used for nearly 40 years in coal mines in China. Firstly, two main forms of grouting by directional drilling technology are introduced in Chinese coal mines in the paper, namely s-shaped small displacement directional borehole used in pre-grouting for vertical shaft and L-shaped extended-reach directional borehole used in grouting transformation for large area formation(it includes the conventional horizontal directional drilling grouting from ground surface, the horizontal directional drilling grouting from ground surface in which part of existing geological borehole is used, the horizontal directional drilling grouting in underground roadways), the depth of pre-grouting for vertical shaft by s-shaped directional borehole and the horizontal displacement length of ground directional borehole for grouting deep strata have all exceeded 1000m; secondly, the author indicates that directional drilling grouting technology is facing a lot of questions, such as grouting theory, process and equipment, inspection and evaluation of the grouting effect, and so on, with the continuous development of coal mining to the deep extension and the scale of a single face continues to increase; thirdly, the author indicates that researchers should strengthen the research on simulation test system for grouting rock under flowing water conditions and grouting simulation test, detection method on grouting effect of deep strata and spread regularity of grout(especially, grouting by horizontal drilling method), detection on grouting effect, find out the main influencing factors of grout diffusion in deep strata, so the law of grout diffusion can be revealed. This paper can provide reference for the program development of grouting deep strata in coal mine, and also points out the research directions of directional grouting technology.

For the safety of wellbore and through the loose layer and the zone containing rich water of strong weathering belt in bedrock, the paper analyzed the difficulties in freezing construction and put forward the solution based on the surface hydrogeology and geological survey results, integrating cross section of wellbore, construction level of domestic inclined shaft, under the principle of safety and reliability, economic savings, combining with freezing and tunneling, servicing tunneling. The freezing program is formulated scientifically by using the technology of freezing vacuum and insulation, treatment technology of freezing connection section in inclined shaft, calculation method of freezing the two sides through vertical holes and fixed beam model in inclined shaft. Equivalent freezing time and control technology of excavation section and the method of freezing step-by-step input are put forward in the construction. The outside holes are connected along the shaft, the middle row of holes are connected along the transverse direction, freezing by segment and input step-by-step. The method of containing with freezing and tunneling is explored and optimized, the freezing cost is reducing by 10%, and the good effect improving the efficiency by 15% is achieved, which could be used as reference for similar freezing construction.

The risk assessment of water inrush from Ⅱ1 coal floor L8 limestone is analyzed when tunnel excavation and coal mining, based on introducing the formation conditions of Zhaogu No.1coal mine. Pre-grouting is the main means to solve the water inrush from coal seam floor. The underground coal seam floor pre-grouting and water prevention control technology is summarized according to the previous construction experience, which is commonly used now. And at the same time, the ground pre-grouting technology with horizontal directional horizontal hole to control water is introduced, combing with the development of new technology. At last the two kinds of grouting and water prevention control technology are compared and analyzed, their advantages and disadvantages and applicable conditions are described. The results show that the ground pre-grouting technology with horizontal directional horizontal hole to control water is suitable for water prevention and control of coal seam floor, and has achieved good results.

Combined with engineering practice of Guo Tun coal mine in Shandong Province, through the grouting treatment of gushing water of fault in air-return roadway, the drainage and slow penetration grouting technology was put forward. This paper expounds the dynamic regularity of the deformation of surrounding rock of roadway under the condition of drainage and grouting construction, carries out related theoretical analysis, and puts forward the technical points and the corresponding suggestions for deformation control of surrounding rock. The monitoring results showed that the factors affecting the deformation of surrounding rock are the arrangement of drainage holes, the design of shallow grouting holes and grouting parameters. The former two are the main factors, and the latter is the dynamic factor. In the actual operation, two main factors can be optimized, and the grouting parameters can be adjusted dynamically to control the deformation of surrounding rock, eliminate the potentially dangerous. The application showed that the surrounding rock monitoring and control technology achieved the purpose of improving the quality of the roof, and the water plugging rate was as high as 96%. Compared with the traditional broken zone grouting technology, it has been greatly improved to ensure the effect of governance and reinforcement.

In order to solve the optimization problem of combined mining of adjacent open-pit mines, the optimal allocation and comprehensive utilization of resources, production, space, time and equipment as the goal, the basic concepts and the applicable conditions of the adjacent open-pit mine non-pillar mining technology, points out the key technology the implementation of this technology need to be solved and the solutions. Taking Heidaigou and Haerwusu open-pit mine as a case study, analyzes the synergistic effect of implementation of non-pillar mining technology in these mines. The results show that: the Heidaigou and Haerwusu open-pit mine implementation of non-pillar mining technology in 2018 ~ 2027 years, can create 2026737(NPV) thousand yuan of direct economic benefits for the two mine.

Based on the 0913 return air roadway construction project of Qi Panjing coal mine, this paper uses the theoretical calculation and numerical simulation method to study the reasonable width of the narrow coal pillar of roadway in gob entry driving. First, the reasonable width of narrow coal pillar is 5.08m, which calculated through the limit equilibrium theory. Then using the FLAC3D numerical simulation software, the paper analyses roadway surrounding rock deformation caused by the different width of coal pillar. It is concluded that the reasonable width of narrow coal pillar is 5m ~ 6m. In order to facilitate the construction management, the final determination of a reasonable narrow coal pillar width is 5m. Keeping a reasonable width of coal pillar and adopting a scientific and effective support scheme, to ensure the stability of coal pillar are the key to the success of the narrow pillar of roadway in gob driving.

Based on the characteristics of gas collected from Duanwang Coal Group, combined with the development of coal mine and the thermal energy demand of coal mine, this paper puts forward and selects the low concentration gas utilization scheme, designs the low concentration gas water mist transmission process, introduces the gas power generation system configuration And waste heat recovery and utilization system, while the low concentration of gas power generation proposed optimization recommendations. The results show that the project can create a certain economic benefits, improve business income, while bringing a good environmental benefits, play a role in protecting the environment.

Based on the introduction of the working environment of the new multi-function roadway repairing machine and the composition of the electric control system, a new multi-function roadway repairing machine electrical control system using distributed control mode is proposed.The system communicates with each other through CAN bus, and each system cooperates with each other to coordinate and control, and respectively bear the different functions of the system, and improve the stability, flexibility and reliability of the whole electrical system. The field application shows that the whole electrical control system has reasonable structure, stability and reliability, reduces the manual work and improves the efficiency of the equipment.

Coal in the coal yard under the action of the wind make the coal dust into the air caused by the pollution of the environment, the common method is to use the manual method of high pressure water gun to the coal at regular time that can not only prevent the coal dust from flying, but also can prevent the spontaneous ignition of the coal in the low burning point under the condition of high temperature in summer. Intelligent sprinkler system based on environmental monitoring which based on wireless sensor network is put forward in this paper. The environmental monitoring timely according to the changes of the main factors, such as wind, temperature and so on, to decide the sprinkler system whether open or and the yield of water .The system uses Stacked Autoencoder and fuzzy forecast to forecast situations . The results show that the effect of dust removal is improved and the water consumption is reduced. The utilization rate of water resources was improved, the dust control efficiency reached 90%, and the utilization rate of water resources was up to 86%.

Abstract: Aiming at the small cabin of mine drainage pump group mainly by manual inspection control, manual control and stop the pump low degree of automation, the equipment failure rate is high, the labor intensity is big, a series of problems such as huge input of manpower and equipment costs. Study on the design of a set of small water pump linkage group automatic control system by optimizing the drainage pipeline, the modular design of controller, sensor, control and selection of monitoring configuration software programming, make full use of PLC, network communications, sensors, modular software programming technology, design a set of small water pump linkage group automatic control system,. The research and application of the system improves the efficiency and degree of automation of mine water pump small tanks by drainage, reduce the labor intensity of workers and equipment loss, reduce the cost of human and equipment investment, and ultimately to reduce labor intensity, save cost, reduce equipment investment, reduce the pump damage rate, promote the realization of mine energy-saving emission reduction targets.

After analyzing the causes and harms of the vibration of the building structure under the excitation of the load including human activities and equipment vibration ect.，the author points out the shortcomings of the existing seismic design methods and puts forward some improvement measures and a view on solving structural vibration problem by using TMD damping technology. On the other hand, the problem of the remote transmission of the structure vibration is analyzed, and a solution to the finite element analysis of equipments and structures is proposed, which provides a solution to the problem of structural resonance.

Abstract: by analyzing the field screening and floating data, comparison of three kinds of coal preparation plan, and ultimately determine the pre desliming and non pressure feeding three product heavy medium cyclone separator +TBS + flotation separation process. Coal pre desliming process is complex, but can reduce the pressure of heavy medium system, reduce the flow rate; TBS fluidized bed coarse coal slime separation makes the whole process more perfect and better separation effect, cost is in coal preparation conditions, increase the profits of coal preparation plant.

According to the conditions of large section open - off cut, deep burial, soft surrounding rock, difficult support of Hong qinghe coal mine, put forward bolt support technology. Through the numerical simulation, the field test and the lithology analysis of the roadway surrounding rock, the support parameters of two open-cut are determined. The pretension of the bolt is not less than 40% of the yield load of the bolt, and 8m anchor is used to reinforce the support. Through the high preloading and strong support, control the early separation and deformation of the surrounding rock. The monitoring results show that the anchor net and cable support can effectively control the deformation of deep high stress, soft surrounding rock and large section open - off, and the supporting effect is good.

In order to improve gas extraction efficiency in Huangling No.2 Mine of Petroleum and Coal Bed Gas coexistence, and increase the speed of mining face and driving. on the basis of obtaining the occurrence regularityof Petroleum and Coal Bed Gas and realized by drill site 11 in working faces 205 belt roadway. Further, combinated with the exact construction design and the hydraulic fracturing equipment which can remote operation and video monitoring, For bottom hydraulic fracturing test research on drill site 11 in working faces 205 belt roadway in Huangling No.2 Mine. The results showed that formation connected fissures between Oil type gas enrichment regional in coal floor and coal With two hydraulic fracturing drilling in floor construction, the Fracturing influence radius is over 20m. The highest water injection pressure respectively reached 26.8 MPa and 25.2 MPa which is more over than the theory fracture pressure 23MPa. The gas extraction concentration increased average 19 times and the Methane extraction from scalar increased average 22 times which are Compared with the non fracturing data by the extraction from monitoring in 2 months . The research results provides the technical support for Gas anti-reflection technology in Coal of Petroleum and Coal Bed Gas coexistence region.

In order to obtain the optimum supporting parameters of the secondary support in deep high-stress surrounding rock, with the Huafeng -1180 rock concentrated roadway as an example, on the basis of the original supporting scheme, the method of optimizing the secondary supporting parameters is presented. According to the condition of surrounding rock and the damage reason of instability, determining the length and row & line space of anchor cable are impact factor to the secondary supporting effect, Calculating the theoretical value of the length and row & line space of anchor cable, and launching the four preliminary design parameters. It adopts FLAC3D to calculate numerically 16 schemes of secondary support and then can get indicators of different supporting parameters about center subsidence of roof, two-side nearer, plastic pile-up of floor. The results show that the ninth project (the anchor length is 8000 mm, the row & line space is 1200 mm×1200 mm) is optimum scheme. The subsidence of roof is 338mm, two-side nearer is 513.8mm, plastic pile-up is 468.9mm, the control effect of the surrounding rock deformation is good and the economy is reasonable, and good results have been achieved in practical application. The results have a good value for determining the parameters of the secondary support and improving support design.

The strata behavior laws of the 42104 fully mechanized caving face was simulated experimentally in Qing Gangping coal mine. This research has showed that the first weighting interval of the basic roof was from 64~66m, and the periodic weighting average interval was 27m.The first weighting dynamic load coefficient was 1.27, and the dynamic load coefficient average of the periodic weighting was 1.36, so the pressure integrally belonged to "medium strong".The more pronounced increase area of the first weighting interval in front of the coal wall is 16.75m within reach in front of the coal wall.The dramatic increase area of the periodic weighting interval in front of the coal wall is 45.01m within reach in front of the coal wall.The advanced support distance of fully-mechanized coal caving face should reach 40m range in front of the coal wall.

According to the characteristics of high gas content and high gas pressure in low permeability seam group, the gas control difficulty of working face in first mined protective seam, and the difficulty of comprehensive eliminating outburst in short distance coal seam group, the comprehensive control technology of mining protective seam combined with gas drainage in gas control lane of the first mined seam , relieved gas drainage through surface well drilling , gas drainage from strike drilling hole in high position and gas drainage through pipe laying in upper corner was put forward ,for example in Coal Mine Wulan. The result showed that the gas flow and gas concentration was stable changing with time, the gas flow and gas concentration increased firstly then decreased along with working face being advanced, the maximum gas concentration of return air sides in working face was 0.36%, the maximum gas concentration was 0.5% and the maximum gas drainage flow was 105.8m3/min in upper corner, which solved the problem of gas transfinite effectively and achieved mining safely and efficiently.

In order to have the soft belt transport lane efficient extraction from the gas in coal seams, developed with high drilling speed, across the belt construction ability, technology strong adaptability and other characteristics of ZDY2800LG type hydraulic drilling rig. Through drilling groping, seeking breakthroughs and efficient in three stages in detail introduces the industrial test of the whole process of drilling rig, explore an efficient drilling technology in soft and broken coal seam.

Coal gangue is a waste, meanwhile it is a reuse of resource. Based on the analysis of coal preparation plant Muguajie and Antaibao coal gangue’s particle size distribution, Density composition，mineral composition, industrial analysis and associated minerals morphological characteristics and other aspects。According to the coal gangue’s characteristics, this paper aims to set up the technical scheme of upgrading and separation of coal gangue use, and form a complete set of coal gangue separation and upgrading technology.

Abstract：Fierce underground press and high rock-burst hazard appear in an island coal face, which especially is more outstanding in km deep mine. Regarding 7121 face of certain mine as field background, the paper explores stress distribution characteristics and rock burst mechanism in roadway driving along next goaf of an island coal face, puts forward support and pressure relief coordination control technique and carries out FLAC2D numerical simulation analysis. The results indicate that the stress distribution is basically a saddle-shaped, stress concentration factor is about 3 and rock-burst is induced by dynamic and static load superposition that the high static loads play a dominant effect while strong dynamic loads play a induced function in an island coal face. The support and pressure relief coordination control technique with the association of inner strong support body of high strength anchor, weak structure body of large-diameter borehole and external strong structure body of primary rock stress is adopted. The peak stress of support and pressure relief coordination scheme is 58.66MPa, two sides convergence deformation is 57.76mm and plastic region is larger on right side, which has the least rock-burst hazard. The field monitoring effect of roadway deformation is significant. The study conclusions provide reference and guidance for preventing coal or rock dynamical disasters in deep mine.

Near Yuwu coal mine N2105 mining face to fold zone, ahead of the coal face in the fold zone into the wind drift floor heave, and the occurrence of the 2 serious floor rock burst. The heading is located in the fold zone as the engineering background, using the field investigation, theoretical analysis, numerical simulation, micro-seismic monitoring and underground test, to study the failure mechanism and control measures of floor deformation. Conclusion: fold tectonic region of lateral pressure coefficient value minimum 1.56, maximum 2.18, strong tectonic stress zone; with the increase of lateral pressure coefficient, there is a mutation point, when λ > 1.5 after the roadway floor in the plastic zone is expanding rapidly, a sharp deterioration in the stability of the surrounding rock bottom; large diameter drilling unloading. The pressure can effectively inhibit the dynamic and static load combination strength, good control effect on the floor deformation. The research results provide a reference for exploring the failure mechanism and prevention technology of the tunnel floor in the fold structure area.

Aiming at the field measurement problem of roof mining failure zone after mining, in order to master the height of fractured zone in roof strata caused by underground mining and ensure the safe mining above the water-bearing stratum. In this paper, the method of the empirical formula prediction and FLAC3D numerical simulation was adopted to study the height of the roof mining fractured zone in a coal, and then the system of double ends borehole plugging device in measuring leakage was applied to the measurement to verify the results of the empirical formula prediction and the numerical simulation, and the three results were compared with each other. The research shows that :(1) the theoretical formula estimated value of the height of coal roof mining failure zone is 41.3m , the result of the numerical simulation is 33.92m，and the result of field measurement is 37.67m . The result of the numerical simulation is basically close to that of the field measurement. However, the result of the empirical formula is expected to be conservative. After comprehensive consideration, the roof strata maximum fractured failure height of the working face is 37.67m; (2) With the advancing of the working face, the plastic zone of the roof strata is still increasing. When the working face reaches 90m, the development height of the roof strata fracture reaches the maximum value of 33.92m, and the height is no longer increased. Its shape is a straight line which is approximately parallel to the top of coal seam , and the change trend of the roof plastic zone is consistent with that of the maximum principal stress; (3) from the section of coal seam tendency, the shape of the roof plastic zone is approximate to the saddle shape, which is consistent with the actual situation. In summary, the results of simulation and field measurement of coal roof mining failure zone can guide the coal mine safety production, and provides an important scientific basis for the prevention and control of mine water, and has important practical value.

In order to improve the situation of ignoring the wave number in the traditional coal logging interpretation, and increase utilization of the logging information, this paper presents identifying the different formations by studying the Choi-Williams distribution rules of bilateral logging, neutron logging, acoustic logging, density logging and natural gamma-ray logging. The result indicates that for the tight formation, the dry formation, the water formation and the coal formation, the contour lines of above logging will shows different patterns. By these rules, the different formations can be identified, and the exploitation value of the coal formation can also be initial determined.

For the sake of further studying the influence of cutting depth to cutting performance，in this article conical pick and coal models are established through discrete element software PFC3D. The simulation of pick linear cutting coal is finished at different cutting depth; recording the forces simultaneously. The accuracy of the simulation results is proved by comparing the results of the numerical simulation with those of the theoretical calculation by means of regression analysis. Then the spectral analysis of the results is performed. The results show that the average cutting force of the conical pick cutting coal and the cutting depth have obviously linear dependence; the larger the cutting depth, the higher the force is. The load fluctuation and the percentage of coal powder are first decrease then increase with the increasing of the cutting depth, while the cutting performance is better at the cutting depth from 15 mm to 20 mm.

Coal winning machine is an crucial equipment to realize the mechanization and modernization in mine production, its running status will affect the whole coal mining efficiency. First, taking a coal winning machine as the research object, the virtual prototype model of transmission system is established in UG and the gear system is systematically analyzed in ADAMS. the gear system of coal mining machine under the normal, geometric eccentric 1 mm and geometric eccentric 2 mm fault conditions is simulated ,Then, the meshing force curves in different time and frequency domain are obtained. the results show that with the increasing of the degree of eccentric, meshing force has obvious cyclical impact in the time domain and the corresponding amplitude increases, besides, in the frequency domain meshing frequency amplitude decreases, the side band amplitude and intensity increased gradually, and use side band meshing frequency amplitude to characterise the fault degree. The results of the study provide theoretical basis for the fault diagnosis and detection.of rocker driving system of shearer.

To refine the detective effects of whole space transient electromagnetic method, the experiments had been conducted aimed at fully mechanized coal mining machine, scraper conveyor and bolt-mesh-support. The characteristics of the whole space transient transient electromagnetic responses of these typical underground interferences were classificated based on the electric potential - time curves and visual resistance rate - depth curves. Furthermore, the measures to weaken interferences had been sumarized and concluded. The results showed that: (1) the interference of large iron equipments will be significantly weakened when the distance to detecting coil beyond 4m; (2) for the iron that is difficult to move, the response is sensitive to the distance and when the scraper conveyor located outside the coil’s projection area on floor or the distance between bolt-mesh-support and coil is more than 0.6m, the interference can be significantly reduced. Finally, field application workd well based on the research results, the research results have well prospects for popularization.

This paper compare the changes of O2, CO and activation energy of five kinds of Se Lian coal samples under different air flow by temperature programming. The experimental result indicated that the oxygen consumption of 0-0.9mm small size coal sample more sensitive about the air flow change, and small size coal sample with low air flow rate have minimum activation energy. Different air flow will rise a turning point of CO production rate at the cracking temperature about 120℃. This paper have a positive instruction to determinate the coal spontaneous combustion and the air flow rate of coal at low temperature oxidation experiment.

Abstract: It is a paper that reviews the varieties, structure, performance and mineralization mechanism at home and abroad of flotation frother. And it’s look forward to provide theoretical guidance for later coal mineralization mechanism of flotation frother.

For studying the change of surface vegetation index caused by mining, taking some mining influenced place of shanxi in 2008 as the object.Selecting eight Landsat TM satellite remote sensing data before and after 2008, through geometric correction, radiation, atmospheric correction and band operation, extract the average NDVI of the mining subsidence range. Establish a curve of NDVI value changing with time, in order to study the law of vegetation index changing within the scope of mining influence area before and after mining. The results show that regional vegetation change is mainly influenced by rainfall conditions before mining, and related to the regional vegetation types; Mining area vegetation change is mainly affected by mining lagging in the process of mining; After mining surface formed subsidence area, generate subsidence basin, cracks, steps, and regional vegetation index decreased.

Flotation column is one of the important equipment in the flotation process, the bubble generator is an important part of the structure of the flotation column. For the pulp aeration and air bubble mineralization, bubble generator performance will affect the mineral separation effect, so the structure design and optimization of bubble generator is particularly important. Through the research on the structure and principle of bubble generator, the use of air entrainment, with turbulent mixing can improve the flow characteristics of gas holdup, and combined with the turbulent Carmen vortex form, and improved the simulation and optimization of a bubble generator, namely "Carmen vortex type bubble generator". Through the simulation experiment, compared to the original bubble generator, the improved structure has obvious effect on the bubble generator throat turbulence intensity increase.

For the problem of fatigue life of hydraulic support link in actual practice, the paper that deals with the study of back link of hydraulic shield support derives drawing force, compression force and torque of the link under eccentric loads. On this basis, static strength and fatigue strength of the linik is analysed, while fatigue life nephogram is plotted. Next analysis is about surface finish factor and their the influence on fatigue life. Finally, the paper analyses load sensitivity to fatigue failure. The calculation results show that surface finish factor and torque of the link have obvious effect on fatigue life of it. The research method on fatigue life proposed can provide theoretical basis and be of valuable reference to optimal design, manufacture and maintance of the back link of similar hydraulic support.

In order to improve the problems of linear vibrating screen life and improve the operation process, such as plate cracking, sieve beam and vibrator beam fatigue fracture failure.In this paper, ZKB1548 linear vibrating screen as the research object, using Solidworks software to build three-dimensional solid model, using ANSYSWorkbench software for modal analysis.It is known that the natural frequency of the linear vibrating screen is close to the working frequency.Using ANSYS to optimize the structure of the vibrating screen, so that the working frequency of the screening machine has a certain safe distance with the natural frequency of the structure, so as to ensure the reliable operation of the screen machine.

At present, coal enterprises are under the new situation, and both the country and the society and the people have made new demands to it, this has force it to explore the path of transformation and upgrading. In this paper, we first define that coal enterprises are faced with the new situation. Then we analyze the current situation and problems of the transformation and upgrading of coal enterprises. Through the case of successful transformation of foreign and domestic excellent enterprises seek the strategy and suggestions for the realizing the transformation and upgrading of coal enterprises. We hope to provide some revelation and help for the current coal enterprises in trouble.

The model of collaborative innovation is the general guiding strategy all of the innovation activities in collaborative innovation. This Study, on the basis of analyzing the characteristics of coal industry research projects，believed that the coal industry collaborative innovation should be the full factors collaborative innovation, whose main body should include government, coal enterprise, university, research institute, user, financial institution and technology intermediary and so on; considered that the model of coal industry collaborative innovation should be classified based on the responsibility and role of main body; and through the empirical analysis, verified the selection method, which is that the characteristics of scientific research project is the main basis of model type selection and team building affects the relationship between the characteristics of scientific research project and the model selection.