In order to solve the serious secondary disasters of the gas overrun or gas explosion, which is caused by coal and gas outburst in mine. In this paper, the equations of fluid transients, convection diffusion and source-containing ventilation network were established respectively to research the dynamic effect and gas migration process of gas outburst in ventilation system of coal mine. In order to research the unsteady movement characteristics of mine airflow under the joint action of gas outburst source flow power and fan ventilation, we completed the experiment of ventilation pipe network system for gas outburst. The fitting equation of gas dispersion parameters under different wind speeds was obtained, which was used as the simulation calculation parameter. In this paper, NC2.0, one simulation software of coal and gas outburst, was developed, and the 10.27 coal and gas outburst accident in Jiaozuo Jiulishan coal mine was reappeared by it. Throughout the simulation process, unsteady air flow and gas distribution in Jiulishan coal mine after coal and gas outburst were simulated respectively by the given fluid changing curve. The research results indicate that the outburst pressure after coal and gas outburst, which is the main factor leading to the changing airflow, and radiates in the form of wave. The high-intensity air flow from the gas outburst source changes the air flow movement of the mine system, causes over air flow phenomenon in return air roadway, suppresses the air volume in air inlet roadway at the same time. Even countercurrent occurs in severe cases. The research results provide the theoretical basis for disaster prevention and aid, reducing loss and preventing secondary disasters in outburst mine.

In order to solve the safety problem of rockburst in coal mining under fault conditions and realize safe and efficient production of coal mine, this paper analyzes the existing mechanism and geological environment of fault, constructs fault monitoring scheme and field construction method, and carries out underground monitoring of F16 fault. The stress and displacement of F16 fault in Gengcun Coal Mine are monitored, the deformation and activity of the fault are analyzed, and the influence on energy when the stress and displacement change is observed. The experimental results show that : Before and after the two large energy microseismic events, the stress and displacement changed significantly, and the energy increased first and then decreased sharply. The mining of working face had an important impact on the activity of F16 fault. The deep mining of coal mine would disturb the coal seam and roof and floor strata, destroy the stress state of the original rock mass, increase the in-situ stress, complicate the geological structure, and develop various faults one after another, It will destroy the integrity and integrity of the coal seam, cause the destruction of surrounding rock near the fault, release energy, cause large energy microseismic events, and in serious cases, it will lead to rockburst accidents. The research results have guiding significance for monitoring the impact of F16 fault activity on Rockburst in Gengcun Coal Mine, and provide experimental methods and theoretical basis for other coal mines to study the change process of energy during fault activity.

In order to prevent the occurrence of rockburst accident caused by the stress concentration of the middle rock pillar in the near-vertical coal seam and affect the mining of the lower coal seam in the known goaf, taking Wudong coal mine in Xinjiang as an example, based on the special geological and mining conditions of the mine, through the simulation experiment and numerical analysis of similar materials, the variation law of the stress distribution of the middle rock pillar with the increase in mining depth is analyzed. A presplitting blasting pressure relief technology of drilling a construction chamber in the middle of the rock column is proposed to form a buffer layer in the rock wall and effectively prevent the continuous downward movement of stress. In order to achieve the optimal blasting effect, the finite element numerical simulation software GTS NX is used to carry out the chamber rock mass hole blasting simulation experiment, the three influencing factors of blasting effect, such as charge quantity, blast hole diameter, and blast hole row spacing, are comprehensively considered, and the optimal pressure relief blasting parameters with the radius of borehole blasting crack circle and the width of plastic zone as the index are determined. The experimental results show that under the condition of determining the physical and mechanical parameters of coal and rock, the blast hole diameter has become the main control factor affecting the blasting pressure relief effect, followed by the charge amount. Through 9 groups of orthogonal tests, the optimal combination of the three indexes is 6 kg charge, 150 mm hole diameter and 10 m hole row spacing. The practical engineering application results of the combination are tested by downhole transient electromagnetic detection (TEM), and it is found that the pressure relief effect is obvious. The preliminary conclusions of the study have guiding significance for the pressure relief and erosion prevention of the middle rock pillar in Wudong mine and provide experimental methods and theoretical basis for the determination of blasting pressure relief parameters in other mines.