Through summarizing and analyzing the development of coal industry under the background of new era from the economic, legal, environmental and social aspects, this paper points out the necessity of building green mines in the new era. In order to realize the goal of building green mines, mining enterprises should actively adapt themselves to the requirements of ecological civilization construction in the new era with the concept of "green", explore the direction of coal industry development accurately, and accelerate the formation of spatial pattern, industrial structure and production mode of resource conservation, environmental protection and operation safety. Taking the green mines in the industrial chain of radiation geological exploration, design, research and development, construction, production and equipment manufacturing as the process carriers, the construction and development system of green mines in the new era is constructed to provide intellectual support for the effective integration of resource efficient development and environmental benign development.

Mine field demarcation is an important design document in the overall planning of mining area, Whether the well demarcation scheme is reasonable directly affects the development and construction of the mining area in the future. According to the coal quality deposit in the mining area and the relevant regulations of coal mine design standard, three classification schemes are proposed for the mine field division, the three schemes are compared and analyzed, select a more reasonable mining plan, It is of important guiding significance for future development and construction of mining area.

Through the secondary development of Revit platform, this paper establishes the mining engineering roadway design module, and realizes the BIM design of underground mine roadway, And based on the software, the design and development of mining lane library, three-dimensional model library。Completed the mine with the exploration and exploitation, construction design and other content parameters of the integration of two-dimensional design, automatic engineering quantity statistics and automatic acquisition of profiles and other functions, Improve design efficiency and design quality. It also provides the basis for digital mine information model and combs the development of geological model modeling standards, laying the foundation for the development of geological models.

For large-scale mine pits, the safety personnel cannot safely withdraw to the ground within a short period of time after the disaster, so they can only wait for rescue in the refuge chamber and cannot escape to the ground in time. Aiming at this problem, this paper puts forward the idea of combining the refuge chamber with the escape route directly to the ground.Based on the features of mining in Buertai coal mine of Shendong mining area and the existing conditions, a small channels quick emergency escape system for coal mine was designed and studied on the basic parameters of the lifting chamber, the layout and size of emergency escape route, the parameters of the lifting system and the main equipment in the system. The escape system transforms the passive rescue after the disaster in the coal mine into active escape, which has positive significance for reducing the supporting facilities of the refuge chamber and reducing the loss of mine disaster.

Shaped blasting plays an important role in roof cutting and pressure relief along goaf retaining roadway. In order to explore reasonable blasting parameters of 110 mining methods and achieve the goal of successful and safe retaining roadway, taking the medium-thick seam 12605 working face of Guandi Coal Mine as the research background, three different charging structures were compared and analyzed by means of theoretical analysis and field research. The test blasting effect under the condition. The results show that under the condition of 7 m blasting hole depth and 500 mm blasting hole spacing, 4+3+2+1 charge from the top of hole to the bottom of hole destroys the roof seriously, and 3+2+2+1 charge slitting effect is poor. With the 3+3+2+1 charging method, the cracks in the blasting hole develop obviously, and the crack rate reaches 87%. Satisfying the design requirements of retaining roadway, the field application effect is good.

Based on the theory of "Roof Cutting Shortwall Beam", the first new test of the technology of in gob-side entry retaining automatically of no-pillar in thick coal seams in Ningtiaota coal mine has been successfully applied. But because of the excessive cost in the initial investment when tanking the block gangue bracket as a roadside support, experts decided that after the basic stability of the roadway surrounding rock deformation has been assured, adopting flexible-formwork concrete columns which has displaced the block gangue bracket as a roadside support. According to the parameters of flexible-formwork concrete columns, the bearing capacity of the flexible-formwork concrete columns is checked to meet the requirements of roadway stability. At the same time, the field construction technology of flexible-formwork concrete columns is expounded. And by combining the effect of roadway retaining with the monitoring data of surrounding rock deformation, it is proved that the use of flexible-formwork concrete columns which replaced the block gangue bracket as the side entry support is feasible, has good effect of roadway retaining reducing the initial investment costs and has made a huge profit.

In order to optimize the determination method of the roof bulk increase coefficient under the condition of gob-side entry retaining formed by roof cutting and further explore its evolution law, the present calculating methods are summarized at first. Then based on the compound roof of 8304 working face in Tashan Coal Mine, through detailed geological examination, natural observation, marker observation and layer thickness calculation, getting the bulk increase coefficient of roof is about 1.40. And the field measurement shows that the lumpiness of the mudstone is smaller than the fine sandstones’, but the bulk increase coefficient is bigger and the length of the coefficient stability zone is longer. Besides, combined with the monitoring of gangue wall maintaining pressure, what can be seen is the lateral pressure of gangue wall decreases when the retaining entry is stable, but the bulking coefficient of gangue has no obvious rebound rise.

The impact of dynamic pressure on mining face-up roadway is great, and it is easy to break.. It is based on the analysis of the stability mechanism of the surrounding rock in the mining face-up roadway, this paper divides the excavation into three stages: solid coal face-up roadway, dynamic pressure face-up roadway and along the stable goaf-up roadway. Accurately grasp the time to stop digging; Segmental dynamic control. The results of this study have some reference value for the study of deformation management of mining encounter roadway under similar conditions.

In order to study the law of spontaneous combustion of coal left behind and the “three belts” distribution range in goafs under the conditions of Y-type ventilation method (supported by soft-membrane wall along side roadway) and high-level drainage roadway in the goaf of No. 3 coal seam in Gaohe Coal Mine, the advance Prediction of Coal Spontaneous Combustion in Goaf. By arranging the bundle tube monitoring system on the working face, the gas is analyzed by gas chromatograph in the goaf area, and the concentration changes of gases such as O2, CO, CO2, CH4, C2H2, C2H4, C2H6 are analyzed, and these factors are taken into consideration to divide the goaf spontaneous combustion "three belts" range. The scope of the “three belts” was finally determined. On the intake side: heat dissipation zone: 0~45m; oxidation temperature rise zone: 45~135 m; asphyxiation zone: greater than 135 m. At the return side: heat dissipation zone: 0~20m; oxidation temperature rising zone: 20~43 m; suffocation zone: greater than 43 m. The monthly advance speed is greater than 70.8 m/month. The practice shows that it is very consistent with the actual situation of the working face, and prevents spontaneous combustion in the goaf, and provide effective technical guidance for fire prevention and extinguishing of the W1310 working face.

In order to solve the problems of poor stability, low data reliability, weak intelligence and complicated operation and maintenance of the existing safety monitoring system of the coal mine, Shendong Coal Group took the lead in upgrading the safety monitoring system, and then the KJ83X(A) safety monitoring. The system was successfully upgraded and upgraded in Daliuta Coal Mine. The system uses CAN bus mode to transmit data through the mine “four-in-one” network, realizing full digital transmission, long-distance power supply, grading alarm, logic alarm, emergency intelligent linkage, and more. System integration and other functions, to prevent data transmission interruptions and false alarms, improve the efficiency and accuracy of uploading data, effectively improve mine accident warning and emergency response capabilities, and ensure the safe production of mines.

Abstract：Study of influence of mining technology parameters of island longwall panel on plastic failure mode of surrounding rock of the underlying alleys in this paper. The stability of surrounding rock mass of the main entry with different mining technical parameters for extraction of the island longwall panel including coal pillar sizes, mining height, advance rate and destressing measures were firstly analyzed and computed. The optimal technical parameters for keeping the stability of the main entry were obtained, these are: 3m gateroad coal pillars, full-seam mining , 3m daily advance and destressing measures ahead of working face. According to the phenomenon of "X" in the plastic failure of surrounding rock under the condition of optimal recovery technology, the key supporting area of the main roadway, the new supporting scheme and parameters are determined. Finally, the support effect of the roadway under the influence of the mining of the isolated coal pillar is calculated and analyzed. The conclusion shows that the deformation of the surrounding rock of the main coal pillar is less than that of the original state, which is beneficial to support.

Aiming at the optimization of branch air volume in mine ventilation network, taking the minimum total power of mine ventilation network as the goal.Based on the balance equation of stroke volume, wind pressure balance equation, branch resistance equation and fan characteristic curve equation, a multi group adaptive particle swarm optimization algorithm (MA-PSO) is proposed to optimize the mine ventilation network.Firstly, the random population is generated and pretreated, and the adaptive value is sorted from high to low. Secondly，taking local optimal solution as the center, the local optimal solution and the average value of the Euclidean distance of other particles as the radius, and the population is divided into five subpopulations, and then the topology item is introduced into the speed updating formula. With the population exchange factor, the particle is searched in the solution space in the subpopulation, and the diversity of the population is ensured, thus the speed of evolution and convergence is accelerated. Finally, the adaptive weight and redundant particles are used to initialize the elimination strategy to improve the searching ability and learning ability of the algorithm. The simulation results show that the algorithm has better multi-modal optimization rate, faster convergence speed and higher convergence precision. The total power consumed by the optimized ventilation system is 26.78% lower than that of the previous, and the energy saving effect is remarkable.

The permeability and mechanical deformation tests were conducted by the self-developed triaxial stress seepage experiment system under different stress levels, and the characteristics of permeability variation and mechanical deformation in coal samples fatigue failure process were studied on the response of stress level. The test results shown that:The hysteresis loops of the stress-strain curves shows the three stage characteristics of sparse-dense-sparse, and with the increase of horizontal stress, the cycle times are greatly reduced and the hysteresis loop is less;with the increase of cycle numbers, the permeability showed three stages of reduce-stability-rising, the whole curve present “U” type, and with the increase of stress level, the curve has the trend of "V" type. The mechanical deformation and permeability changes have close relationship in coal samples, in the process of circulation, the change tendency of the coal samples in permeability and strain accumulation volume growth were the same, which experienced the process of slowdown - stability - accelerate.

In the laboratory simulation of a small square pipe with a single head, a micro thermocouple, an ion current sensor and a flame optical signal sensor were used to test the change of temperature, ion current intensity and velocity during the two conditions of the ignition of the top and the 400mm position at the top of the distance. The experimental results show that: When the ignition occurs at the top 400mm position, the temperature is higher during the propagation of the flame to the closed end, and the highest temperature in the pipe is greater than the maximum temperature of 623K at the top of the ignition. The velocity of the flame propagating to the two sides of the pipe produces a difference of several times, the maximum velocity to the closed end is only 0.89m/s, and the speed of spreading to the outlet reaches 20 m/s, less than the speed 33.33m/s at the exit at the top of the ignition. The peak value of ion current propagating to the closed end is 0.03μA, while the peak value of ion current reaches 0.38μA at the top ignition. At the top of the ignition, the velocity of the flame spread in the pipe and the peak value of the ion current are large. It shows that the combustion reaction of the premixed gas flame at the top ignition is more intense.

In order to demonstrate the water drainage feasibility of the Baotashan fissured sandstone aquifer at the bottom of the Jurassic coalfield, the water drainage tests were performed using single borehole or multi boreholes in lingxin coal mine located in Ningdong mining area as an example. Then, we analyzed the dynamic variation law of the borehole outflow rate and evaluated the effect and feasibility of water drainage aimed at the bottom aquifer. The test results show that at the initial stage, the borehole discharge is large, and the flowrate gradually decreases and become stable after a week or so. A landing funnel centering on the water discharge borehole is formed when the valve was closed, and the influence radius is large (both greater than 700m), and the water pressure of each borehole is significantly reduced. From single borehole drainage to three boreholes superimposed drainage, the shape of the landing funnel keeps expanding, the influence radius gradually increases, and the water pressure of each borehole decreases gradually. The water inrush coefficient of the coal seam floor calculated by water pressure of FS2, G1 and G2 holes is less than the normal standard (0.1mpa /m) in the water drainage stage using single borehole. The water inrush coefficient of the coal seam floor calculated by the water pressure of FS2, JG, JF, G1 and G2 holes is lower than the normal standard during the period when multi boreholes were used for water drainage. It shows that it is feasible to realize the advance dredging and releasing of the sandstone aquifer located at the bottom of the coal seam through water drainage tests, so as to ensure the safe mining of the working face.

During the natural oxidation of coal, different concentrations of component gases will be generated at different stages, Based on this, this paper designs and implements a multi-sensor measurement system. The infrared CO2 sensor, electrochemical carbon monoxide sensor, primary cell oxygen sensor, infrared gas sensor and digital temperature and humidity sensor were selected as measuring components. Designed measurement circuits for each sensor according to industry standards to ensure the reliability of sensor data. The system adopts a modular design concept to facilitate later upgrade and expansion. The test results show that the system meets the requirements of coal-related industry standards. The system has certain practical value for the quantitative study of spontaneous combustion of coal and the prediction of coal spontaneous combustion.

According to the analysis of the motion system, positioning method and installation method of the gearbox device of multi-rope friction hoist in mine, the error factors affecting the turning precision are studied. Through the establishment of a geometric model, the influence of various factors on the final turning results was studied, and through the test of the turning and milling device, the test results and the theoretical analysis were compared and verified. The results showed that the positioning of the vehicle groove device will occur at the same time. And the installation error, in which the parallelism error of the turning device and the gimbal axis has a greater influence on the turning result. Improvements have been proposed in terms of control systems and installation methods for test results.

Coal seam gas content is an important indicator for the evaluation of CBM constituency, and is also an important parameter for the calculation of CBM reserves. This paper takes the 4# coal seam of Dafosi minefield as an example, according to the test data of well field and borehole test data of CBM wells, through the correlation analysis to screen out the main control factors from many factors affecting gas content, and use multivariate stepwise regression method to combine the main control. The factors established the prediction model for coal gas content of the 4# coal seam, and the predicted values are basically consistent with the measured values. On this basis, the prediction of unknown gas-bearing boreholes and the preparation of the contour map of gas content of the 4# coal seam in Dafosi minefield provide important guidance for the evaluation and development of CBM resources in the study area.

Abstract： In order to investigate the mechanical properties of rock in cold region under cyclic loading, red sandstone that subjected to different freezing-thawing cycles is taken to carry out uniaxial compression test and uniaxial cyclic loading-unloading test. The results show that the peak strength and elastic modulus of rock is decreased gradually with the increase of the number of freeze-thaw cycles, while the peak strain and Poisson's ratio is increased gradually, and the failure of rock presents a tendency that transition from brittleness to ductility. The average modulus of cyclic loading and unloading is decreased rapidly with the increase of the number of freezing-thawing cycles, and the unit volumetric dissipation energy tends to increase with the increase of stress level, but the tendency is decreased with the increase of the number of freezing-thawing cycles.

Abstract: In order to study the response characteristics of ultrasonic acoustic signals in different freezing stages, a thermo-acoustic unidirectional coupling numerical simulation method was proposed by using COMSOL software solid heat transfer and pressure acoustic module. The temperature field evolution characteristics and the variation of ultrasonic acoustic parameters between the two freezing holes in different freezing stages were obtained. The results are as follow: (1) The reduction of 25 d,40 d and 42 d sound pressure are 51.83%,51.48% and 10.29% respectively than 90 d;(2) The peak sound pressure of the frozen wall intersection is 45.91% higher than the peak sound pressure of the uncrossed circle;(3) Ultrasonic average velocity are 2088 m/s, 2379 m/s, 2670 m/s and 2885 m/s respectively increase with freezing time（25 d、40 d、42 d、90d）.According to the on-site test results, the measured value of the field and the simulated value are within 5%, which prove this numerical simulation method can be an effective method to forecast acoustic parameters of freezing wall at different stages.

The determination of engineering treatment range of multi-goaf is an important index to evaluate the feasibility of railway line construction in mining area.By the method of field investigation,theoretical calculation of residual deformation and numerical calculation,the characteristics of surface displacement and deformation and the influence of residual deformation in multi-goaf with time are analyzed in combination with the numerical calculation of ground subsidence in the field area of quasi line selectionThe results show that the residual deformation of railway track site accounts for 2% of the deformation.There is a certain distance between the site selection and the goaf and the surface deformation is small.The residual deformation does not affect the construction of the project if the old goaf is not activated.So it is appropriate for the railway site to be constructed in general without the occurrence of new mining.The research thought provides reference for the selection and judgment of similar engineering sites.

In this study, a lignite was used as the adsorbent to remove COD in coal gasification wastewater at controlled conditions of reaction time, temperature, initial concentration, coal loading, etc. The adsorption behaviors were analyzed with reaction kinetic models and isothermal models. The results indicated that the adsorption reactions of COD on the lignite could be explained well by pseudo-second-order model, and the reaction rate was controlled mainly by film diffusion. In isothermal tests, Freundlich model could describe the mechanism of the adsorption of COD on the lignite. Through calculating the thermodynamic parameters, the adsorption was found spontaneous, exothermic and entropy dropping. Although the removal rate of COD reached as high as about 90%, the coal loading was so large as to use this method to completely remove COD in actual coal gasification wastewater treatment. However, this method could be used at a lower coal loading as a pretreatment with the purpose of decreasing treating difficulty for the subsequent bio-chemical treatment.

This article introduces the application status of roadway repairing machine in our country at home and abroad，Pointed out that in our country roadway roadway repair machine repair problems in the process of governance，Combined with China's coal mine deformation roadway repair and construction characteristics，Proposed China's coal mine roadway repair machine technology development，It provides references for the research and development and promotion of roadway rehabilitation equipment.

Abstract: For the problems of difficulties in discharging drilling cuttings and hole collapse while drilling the drill hole along soft coal seam, this paper introduces the combination of high speed auger drilling technology and screen pipe completion，a new type of open and closed bit is developed for process demand, in the Sijiazhuang core mine of Yangquan Coal Group, 3 drill bits have been used, with 10 total drilling holes of 1057.5m, the average life of the bit is 352.5m, the maximum single hole depth 148m, the screen rate reached 99%, and the application effect is good.

In view of the requirements of large mining and high roadway construction projects in coal mine, the functions in lifting platform of mine car are put forward. The hydraulic system of WC10E (G) -45 in lifting platform is designed on the requirements, and the working principles of leg system, avoiding top system, lifting system and locking system are respectively introduced. The Hydraulic components are calculated according to the requirements and the type is selected correctly. Through the reasonable design of the hydraulic system circuit, the control performance of hydraulic system is optimized, the reliability of hydraulic system is improved and the safety of the construction workers is enhanced.

Abstract: The China’s energy structure dominated by coal has severely hampered the development of low-carbon economy. A great many of experts and scholars do a lot of studies on optimization of China’s energy structure. In that context, Temporal distribution characteristics of papers and progress of energy structure are analyzed. The progress of energy structure is reviewed from the aspect of characteristics of energy structure, influence factors, optimization model and countermeasures. Then the research directions in the future are forecasted to guide the energy structure research. The results are follows. ①Research on optimization of China’s energy structure is at the initial stage and in a stage of rapid development after 2004. The quality and quantity of papers are improved significantly in the later stage. ②Characteristics of energy structure include dominant position of coal, high outer dependency for oil, low energy efficiency, backward energy technique, distortions in the prices of energy and low resources disposition efficiency. ③Influence factors include energy price, resource endowment structure, economic development, population, industrial structure and energy consumption. ④Study on energy structure transformation path optimization and energy structure evaluation system in the future is of great significance.

According to the problems that emergency management about coal mine development status and evaluation of the one-dimensional problem, Based on fuzzy analytic hierarchy process,and around the four stages of“Prevention - Preparation - Response – Recovery”, emergency capability evaluation system has been built,which included 4 first-level indications and 16 second-level indications.The evolution process of coal mine emergency response was divided into four periods by using of Logistic curve, that is starting stage,growth stage,mature stage and stable stage.Comprehensive analysis and assessment of a coal mine enterprise's emergency capability and its ability to determine its emergency capability is "good".The results showed that this method provides a quantitative basis for the coal mine enterprise to improve its emergency response capability,thus improve the level of emergency management and the ability to respond to emergencies.