Coal and gas outburst simulation system and method

Abstract

The invention discloses a coal and gas outburst simulation system which comprises an electronic universal testing machine, an outburst simulation device, a gas system, a confining pressure hydraulic system and a computer, wherein the outburst simulation device consists of a lane side simulation mechanism and a lane side surrounding environment simulation mechanism; the lane side simulation mechanism comprises a baffle, a ventilating plate, a coal rock sample and a U-shaped clamping sleeve; the lane side surrounding environment simulation mechanism comprises a base, a cylinder, a cylinder cover, a lower pressing head, an upper half concave pressing head, an upper half convex pressing head and a piston; the gas system comprises a gas tank, a pressure reduction valve and a gas pressure meter; the confining pressure hydraulic system comprises a confining pressure hydraulic box, a confining pressure liquid flow-in pipe, a hydraulic pump, a check valve, a confining pressure liquid overflow pipe, a confining pressure hydraulic pressure gauge and a confining pressure liquid overflow valve. The invention also provides a coal and gas outburst simulation method capable of simulating coal and gas outburst without disturbance influence and under disturbance influence. The system and the method which are disclosed by the invention can really reflect a coal and gas outburst process of a coal mine and are high in practicability and favorable for popularization and use.

Description

technical field [0001] The invention belongs to the technical field of coal and gas outburst mechanism research, in particular to a coal and gas outburst simulation system and method. Background technique [0002] In the study of the mechanism of coal and gas outburst, existing theories point out that in-situ stress, gas pressure and mechanical properties of coal and rock mass are the three factors affecting coal and gas outburst. As for the mechanism of coal and gas outburst, the influence of the three factors has not been determined. Therefore, many scholars at home and abroad have carried out the laboratory simulation process of coal and gas outburst, and have obtained a lot of research progress. However, the in-situ stress of the coal and rock mass in the mine includes axial pressure and confining pressure. Because the confining pressure factor is difficult to control, the existing Most of the tests control the axial pressure and gas pressure, and the confining pressure...

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Problems solved by technology

[0002] In the study of the mechanism of coal and gas outburst, existing theories point out that in-situ stress, gas pressure and mechanical properties of coal and rock mass are the three factors affecting coal and gas outburst. As for the mechanism of coal and gas outburst, the influence of the three factors has not been determined.

Therefore, many scholars at home and abroad have carried out the laboratory simulation process of coal and gas outburst, and have obtained a lot of research progress. However, the in-situ stress of the coal and rock mass in the mine includes axial pressure and confining pressure. Because the confining pressure factor is difficult to control, the existing Most of the tests control the axial pressure and gas pressure, and the confining pressure cannot be controlled, so it is difficult to complete the mechanism research on the influence of confining pressure on coal and gas outburst; moreover, the existing coal and gas outburst simulation tests do not fully consider the influence of disturbance factors, Even if the influence of disturbance is considered, the influence of roof disturbance is mostly considered, and the disturbance intensity and disturbance time cannot be measured. In actual coal mines, the coal rock mass is often affected by the mining of the coal cutter, the blasting of the tunneling surface, and the drilling of the roadside coal rock mass. Holes, etc. are affected by different degrees of disturbance, and often due to disturbance, the mechanical properties of coal and rock mass change, causing coal and gas outburst, which poses a great threat to normal underground coal mining and personnel safety. Therefore, in the prior art The authenticity of coal and gas outburst simulation is poor, and the process of coal and gas outburst cannot be truly simulated, and the accuracy of the obtained research data is not good

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