Evolution Features of Coal Containing Methane Invaded by Magmatic and Its Impact on Rock Cross-cut Coal Uncovering

Through the sample analysis of magmatic rock invaded coal containing gas in Haizi Mine, studying the evolutive laws of coal containing methane invaded by magmatic using theoretical analysis and field test. We obtain the conclusions that after the coal is invaded by magmatic, the degree of coal metamorphism is improved, and gas adsorption limit increases 0.54 times, the strength decreases by 41.17%, gas content increases 1.07 times, gas pressure increases 3 times, the possibility of coal and gas outburst improves accordingly. COMSOL-Multiphysics simulation is combined to study the stress distribution of overlying strata magmatic rocks and sandstone, the conclusion is consistent with the results of the field test.