Improving ventilation efficiency is one of mining safety measures, and High efficient drilling technology for mining area by raise boring machine is significant method. Ventilation shaft arrangement and anti-well drilling capacity is analyzed for the characteristics of western stratum. The idea about achieving the function of large diameter shaft ventilation by air dual shaft. Mine shaft rising boring technology of air dual shaft is proposed in order to avoid close-range shaft accident. The specific construction process is complete two guide holes firstly, expand drilling afterwards. The reinforcement measures such as grouting should be done when guide hole is drilling. The good effects of technology is proved by air dual shaft construction in Sihe coal mine.

In order to further study the causes of wellbore icing and analyze the effect of wellhead freezing on the ventilation system, it is prevented from causing harm to the safe production of coal mine. This paper discusses the safety problems of wellbore coal mine installation during the foundation construction and the construction measures and technological processes to be paid attention to when installing the wellbore in low temperature environment. The results show that the influence of low temperature weather and natural wind pressure on the shaft construction of the shaft can be overcome by mechanical ventilation, closed, heating and wind control, so as to ensure the safe construction of the wellbore in winter and greatly reduce the construction period and bring the Huge security and economic benefits.

In order to sustain the surrounding rock mass stability for strong mining-induced gob-side roadway in thick coal seam, the failure mechanism was investigated by a case study with serious floor heaven, large surrounding rock mass deformation, supporting fatigue in Tashan coal mine. The observation results indicate the strong mining-induced pressure dominantly caused the floor heaven and the supporting fatigue, poor bearing capacity of the coal roof induced the large surrounding rock mass deformation. The supporting technology with releasing concentrated stress in floor and totally using cables in roof and upper corner was tested in the roadway. The test results proved this supporting technology has the good performance on enhancement of supporting stability and decrease of floor heaven and sidewall deformation by 250mm and 100mm, respectively.

In order to study the dynamic mechanical properties of northwest artificial negative temperature early age high strength concrete, the impact compression tests were conducted on different age of high strength concrete at -7℃ on SHPB apparatus. In the SHPB tests, a lot of stress-strain curves were gained with different strain rate. It is found that the effects of curing environment temperature on high strength concrete strength greatly. Under the standard and -7℃ curing environment, the 3d strength of concrete specimens are 77.4% and 46.7% of the uniaxial compressive strength respectively. At low strain rate, brittleness of negative temperature concrete is more obvious. In the medium-high strain rate (more than 30s-1), the toughness of negative temperature concrete increases, but brittleness decreases. The dynamic compressive strength and peak strain have obvious strain rate relationship. Three age peak strains are in 0.002~0.004. Under the same strain rate and age of concrete, the strength and elastic modulus increase with the impact number decreases, on the contrary, the peak strain increases.

The wear - resistant lining of the original coal hopper plays an important role in protecting the funnel structure.This article through the analysis of the original coal wear-resisting lining damage mechanism, raw coal in the corrosion of strong acid liquid (such as sulfur, phosphorus composition) is steel corrosion and concrete "carbide" , the main factors when bunkering as a result of the impact of raw coal block lining deformation or loss of incentive, both together, causes the damage of funnel wear-resisting lining.Combined with practical engineering, puts forward new funnel wear-resisting lining - - microcrystalline ceramic metal composite plate, can effectively solve the shock and corrosion problem, wear-resisting lining damage caused to such engineering design and construction is of certain reference value.

In order to prevent the toxic and harmful gas from spreading to the outside of the gasifier through fractures of surrounding rock,and ensure the safety of the gasification process, a roadway filling process was presented based on the basic properties of super high-water material.Firstly，an auxiliary filling pipe and an exhaust pipe were laid out at the maximum elevation of filling roadway roof and extended to the outside of the airtight wall before the roadway was sealed.Then, the airtight wall is constructed at the end of the tunnel, and the filling pipe is connected with the auxiliary filling pipe. Finally, the mixed slurry was poured into the roadway after the filling preparation work was completed, and the filling operation was finished when the mixed slurry was flowed out from the exhaust pipe continuously. The process was used to fill some roadways of gasifier in Shanjiaoshu UCG program. The results show that the filling rate is over 91%, which means the strong fluidity of super high-water material meets the requirement of roadway filling; the existence of roadway slope is conducive to the flow of filling slurry,which can improve the filling rate;there is only one exhaust pipe in each of the filling roadways, and the air could gather in the top of roadways.In addition, the reasons for the burst of filling pipe, frequent start and stop of injection pump,and the precipitation of the slurry occurring in the filling process are analyzed, and the corresponding improvement measures are given.

Men ke qing Coal mine of temporary reservoir into a permanent transfer pool need reinforcement design, according to the water storage requirements of the transfer pool and design data，in this paper, the dam axis of transfer pool and dam type has carried on the arrangement and selection，for the dam foundation treatment, on the dam structure design, built on the bottom of the transfer pool, transfer pool of reinforcement design in storage capacity meet the requirements. Meanwile to waste material coal gangue as the main filling materials to reinforce the transfer pool, using waste treat waste, not only can make full use of waste resources, change waste material into things of value,but also can reduce coal gangue harm to the environment, with the very good application prospect, this will provide reference for similar projects.

The expansion project in Shaqu Coal Preparation Plant as the background, according to the existed technology, equipment, layout and other aspects of the problem, combined with the coal data and Shaqu mine production, focusing on the preparation process design and optimization, to determine the equipment selection and other aspects were summarized, and the production operation of the new old system and existing problems analyze.

The hoist braking system is a key part of mine hoist and an important barrier to ensure the safe operation of hoists. In order to determine the vibration characteristics of the braking system and avoid the resonance phenomenon in the using process， this paper takes the TP1-150 type mine hoisting mechanism system as the research object， establishes the 3D model of the brake system through the Solid Works， and the finite element model by using ANSYS Workbench. The first ten natural frequencies and the main vibration modes are obtained from the modal analysis. In addition， to ensure that the hoist braking system configuration can withstand various sinusoidal loads at different frequencies，the amplitude frequency curve is obtained by the harmonic response analysis， which shows that the dangerous frequency ranges of the brake system and the maximum vibration amplitude of the system when the system resonance occurs.

In order to speed up the cutting speed of continuous miner and improving roadway quality，through practice summary, the bidirectional cutting process of continuous miner is obtained.The operation steps of bidirectional cutting technology of continuous miner are introduced.By comparing with one-way cutting coal technology, the advantages of bidirectional cutting coal are obtained.Field application also verified the effect of bidirectional cutting coal process.

In order to understand overlying strata movement law of shallow-buried deep coal seam, the paper using field measurement to research the overlying strata movement law of Yang Wan Gou coal mine 6204 working face, the results show that: the height of water flowing fractured zone is 97m, 12.12 times of mining thickness, with a height of 22m collapse. 2.75 times of mining thickness; subsidence center of goaf subsidence is greater than the measuring points around the middle, sinking faster, express the symmetry in the overall form; starting at the surface of narrow face Yang Wan Gou distance of 78m coal mine was about 0.45 times the depth of the distance is too large; above the working face can not form a "vertical three zone", but only the formation of caving zone and fractured zone of the "two belts" structure.

Aiming at the problems of multiple-dust source, high dust concentration and high wind speed on fully mechanized face in high gassy and outburst coal seam, put forward the idea of combination of source control and prevention and reduction. Taking theE9.10-21050 coal face as the research object, A three-dimensional dust suppression technique for fully mechanized mining face is designed, which mainly consists of coal seam water injection, coal dust source tracking spray, moving frame automatic spraying, drilling foam dedusting, return air dust control and automatic spray. And a field application was carried out on E 9.10-21050 coal face. The results show that the three-dimensional dust control technology for cutting coal, moving, drilling, transshipment and other operating points, has a dust reduction efficiency of 80%-88% for total dust and 79%-86% for respirable dust, realizing the goal of controlling dust effectively on fully mechanized coal mining face in high gassy and outburst coal seam.

In order to control the coal dust disaster in the fully mechanized top coal caving mining face in thick soft roof-floor coal seam, the forces between dust particles -and the water injection dust prevention mechanism were theoretically studied. According to the geological conditions of the 1st coal mine of Pingyu, the deep borehole water injection was used to reduce the high coal dust. The results showed that the liquid bridge force was the key factor to reduce the high coal dust. After the deep borehole water injection, the moisture content of二1- 13110 working face (3% before the water injection) was increased to 5% ~ 7% . In addition, the coal dust content of the different sites of the working face was decreased by more than 50%. The water injection has obvious anti-dust effect, which provides a reference for the treatment of coal dust disaster in soft roof-floor coal seams.

Abstract: Based on the analysis of the physical characteristics of the drilling seam、the technical difficulties of the drilling fluid and its adaptability requirements in the Binchang mining area, the rationality of the drilling fluid distribution in different wells is studied. The results show that in the first spud drilling, the high density and high viscosity pre-hydration bentonite drilling fluid system has good adaptability and good drilling effect. The drilling fluid density is 1.02 ~ 1.10g / cm3, the viscosity is 17 ~ 25S, the sand content is less than 4%; The second section drilling, non-target coal seam section should adopt low solid or solid polymer drilling fluid system, drilling fluid density of 1.01 ~ 1.06g / cm3, viscosity 16 ~ 20S, sand content of less than 2%;.For the target coal seam section, pointed out that the drilling fluid density window suitable for different fields, and it is appropriate to use low solid or solid-free water-based polymer drilling fluid system, also water drilling can be used, and provide reference for non-solid polymer drilling fluid formula. The paper provides the reference value for the drilling optimization of CBM development in Bingchang mining area in the future.

In order to further study the movement and deformation mechanism of overlying strata with roadway backfill under the strong aquifer and to obtain the development law of the, the coal mine 3D model is established by combining the geological conditions of the mining area, then FLAC3D numerical simulation software is utilized to simulate the development of the water flowing fractured zone in the coal mine. In this paper, the development of water flowing fractured zone under three influence factors, such as mining thickness, filling rate, and elastic modulus of backfill, are simulated respectively. The height formulas of water flowing fractured zone with different influence factors are obtained by regression analysis. Base on the actual situation, the results show that it is safe and feasible to coal mining with roadway backfill under the strong aquifer with remarkable economic benefits.

Aiming at the technical problems on improving the wind wall auxiliary fan ventilation efficiency，based on the basic theory and auxiliary fan ventilation air flow，establishes the theoretical model of the ejector is installed without ventilation wall auxiliary ventilation fans， application of Fluent software for numerical simulation，and the influence of similar tests simulation model in different ejector for export the auxiliary fan ventilation efficiency.The results show that：the outlet section of injector is suitable to effectively improve the auxiliary fan ventilation efficiency，increase the roadway air volume，enhance the adaptability of underground auxiliary fan ventilation method，improve ventilation efficiency，reduce the energy consumption of auxiliary fan ventilation，and promote mine production safety and energy saving of mine the ventilation system and has a certain reference value.

Ordinary concrete sprayed layer had the disadvantages of low strength and poor ductility, and it was difficult to couple with the bolt support for jointly maintaining the stability of soft rock roadway. Therefore, the material ratio test was carried out based on the ordinary sprayed material. The optimum conditions were as follows: the cement-sand ratio, the content of polymer powder, the content of polypropylene fiber, the content of organic emulsion, the mechanical properties of the flexible spray layer were improved, and the ratio of the soft sprayed material was determined as follows: cement-sand ratio of 1/2, 5044n powder content of 1.5%, PP fiber content of 0.15%, PS emulsion is 20%. Under the same strength and equivalent force, the thickness of the flexible spray layer was only 1/20-1/10 of the ordinary concrete spray layer, which reduced the thickness of the roadway and the cost of roadway construction and support.

In this paper, the development status of coal gangue identification technology during caving mining is studied. Aiming at the problems faced by coal gangue identification technology, this paper analyzes the current development status of coal gangue recognition technology and the suitable conditions of various methods and the problems to be solved in application from the aspect of the principles, technical characteristics, advantages and disadvantages of various identification methods for coal gangue. The key points and development trend of coal gangue identification technology in the future are also given. It has reference value for the research and application of coal gangue identification technology.

Aiming at the problems of low efficiency, poor quality, high labor intensity and low safety factor in the welding of steel bar and steel strip in China, this paper studies the technology of straightening, feeding welding and blanking intelligent welding of steel bar. The quality uniformity of resistance pressure welding is "two times straightening + distance buffer + speed step". In the servo control "intelligent control" technology, the welding technology of resistance pressure welding + double power supply independent series power supply mode is studied, and the automatic steel strip welding technology and equipment (including the modulation cutting machine, the fully automatic steel strip welding machine and the fully automatic steel strip welding machine) are studied to realize the intelligent welding of the automatic steel strip. The stability of the welding point and the welding shear standard meet the technical requirements, and a set of intelligent welding technology for steel strip in mine is formed, which can be used for reference for the upgrading and application of other mining steel strip welding technology.

Aiming at the simulation of rock deformation in mining protection applications, a two-dimensional rock mass model based on deterministic finite cell automata is proposed. This model uses automata theory to describe the internal and surface settlement distribution of rock masses, and can obtain the settlement trough profile in a relatively simple way. The profile is consistent with the geodetic observation profile. Based on the existing cellular automaton solution, a horizontal displacement simulation optimization method based on the propagation function concept was proposed by adding a copy of a subsidence grid to the second cell grid of the model. The method can simultaneously simulate the horizontal displacements on the interior and surface of the settlement and rock mass models. In addition, a ratio formula for describing the maximum horizontal displacement and the maximum settlement was determined. The deformation distribution of 300m 800m rock mass caused by coal seam extraction was simulated. The results show that the settlement and horizontal displacement results of the proposed model are consistent with the geometrical integration theory, and its feasibility is verified.

The vibration acceleration signal of the cutting reducer under different working conditions of roadheader was collected and analyzed in the time domain, frequency domain and time-frequency domain. In time-frequency domain, some intrinsic mode functions were obtained using variational mode decomposition, each component signal was demodulated by Teager energy operator, and the variation of instantaneous frequency was analyzed. The frequencies of 280Hz and 350Hz appeared repeatedly, which is related to the working frequency of the roadheader. The conclusions provide data support for studying the vibration characteristics of the roadheader, optimizing the structure design, monitoring the real time state and carrying on the fault diagnosis.

The working principle of shearer hydraulic valve controlled cylinder PID height adjustment system is provided. The simulation model is established based on AMESIM. Under the circumstances of the target value of height adjustment is unchanged and stage changed, PID parameters are optimized based on Genetic Algorithm and three groups of optimization values are obtained and gived. The optimization results as follows: when the target value of height adjustment is unchanged, the response speed of the piston displacement is improved after the optimization and the response timeis 0.39 s; When the target value of height adjustment is changed steply, the response speed of the piston displacement is also improved after the optimization and the response time is 0.15 s. It is further proved that this method can optimize PID parameters and is of guiding significance to the PID height adjustment system of the valve controlled hydraulic cylinder of the shearer.

The finite element simulation model for inclined strut of a conveyor is built by CAE tool, then the design of experiment and response surface method are introduced to fit response surface model for fatigue life of inclined strut. On this basis, considering the effect of random factors such as dimension, load and material performance etc., the reliable life prediction problem can be solved by using performance measure approach, and then the reliable life and sensitivity degree can be gotten directly. Finally, the structure of inclined strut is improved by using sensitivity degree, the reliable life of new structure is longer than before.

This paper starts from the analysis of the reasons affecting the safety of coal resources, expounds the six major factors affecting the safety of coal resources, including politics, economy, technology and transportation,etc. The paper makes a comprehensive analysis of the present situation of the safety of coal resources in China, including the distribution, reserve and exploration of coal resources, the total amount and composition of coal resources, and production capacity. Through the analysis of the current security situation, the paper puts forward seven major problems existing in China's coal resources security, and finally puts forward countermeasures and suggestions to improve the level of coal resources security, so as to provide a certain reference for macro-control of the national or local coal industry.

Based on time series data from 2008 to 2017 to analyze the influence of coal price fluctuation,using the vector autoregressive model to run the Granger causality test, the impulse response and the variance decomposition analysis to discuss the asymmetry effect of the overall price level under the influence of coal price fluctuation. The results indicate that the decline of the coal prices affect the inflation more significantly than the increase. In addition, with the transition from ppi to cpi, the impact of inflation will be weakened in the long term, which also confirmed the ppi response more sensitive to coal price shocks than cpi. We present a series of countermeasures and suggestions on how to avoid the extreme fluctuation on the overall price level caused by the coal price shock according to this analysis.

Abstract: In this article, the coupling coordination into the microscopic research field of coal industry was introduced. The index system of the coordination of economic-resource-environment (ERE) in the coal industry and the calculating methods were put forward .It makes an empirical study and takes Shanxi Province as an example. The economic, resources and environmental development index of coal industry are analyzed respectively. Multidimensional measures are made for the coordinated development of subsystems, The results show that the coupling level of the ERE system in the coal industry is in the upward trend since 2005 to 2015, but it has been in the near-imbalance state of 0.3852-0.5228, and it shows a rising-down-rising fluctuation cycle, The level of coupling between economic, resource and environment is between mild mismatch and reluctance. The contradiction between economic resources subsystem and environmental subsystem is the main reason that restricts the overall coordinated development.