Experimental method for cracking gas-containing coal mass by high-power pulse waves

Abstract

The invention relates to the technical field of production of coalbed methane (mine gas), in particular to an experimental method for cracking gas-containing coal mass by high-power pulse waves. The method comprises the following steps: preparing a coal sample; mounting a high-power pulse generation mechanism; mounting an acoustic emission testing mechanism; enabling the high-power pulse generation mechanism to emit high-power pulse to the coal sample to fracture the coal sample, and enabling the acoustic emission testing mechanism to test and analyze acoustic emission in the coal sample; mounting a shock wave testing mechanism and enabling the shock wave testing mechanism to test and analyze shock wave characteristics in the coal sample. The experimental method has the following beneficial effects: required pulse energy for better coal mass fracturing effect can be determined, time-space evolution laws of acoustic emission in a gas-containing coal fracturing process under higher ambient pressure and high gas pressure are analyzed, influence of gas pressure on acoustic emission characteristics is discussed, experimental study in the shock wave characteristics and laws of shock wavefractured coal samples is realized, and numerical calculation and analysis are performed on fracturing laws of different-waveform energy shock waves.

Description

technical field [0001] The invention relates to the technical field of coal bed methane (mine gas) exploitation, in particular to an experimental method for cracking gas-containing coal bodies by high-power pulse waves. Background technique [0002] In recent years, with the development of science and technology, my country has made a breakthrough in the development of coal seams. As my country's coal demand increases year by year, the mining of coal seams in my country has gradually shifted to the deep. Deep coal seams have high gas pressure and high gas content, which easily lead to coal and gas outburst dynamic disasters in the mine production process. In order to prevent coal and gas outburst disasters and ensure safe production, it is necessary to drain the gas in the coal seam before mining the coal seam. However, the gas permeability of deep coal seams is generally low, so gas drainage is more difficult. In order to reduce the difficulty of gas drainage, measures ne...

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