Influence of Surrounding Rock Stress on Gas-Solid in Deep Coal Seam Roadway

Abstract

In order to study the stress distribution in the deep hard coal seam roadway environment, the gas seepage law under the stress of the surrounding rock is analyzed. The self-made triaxial infiltration apparatus is used to simulate the damage deformation, gas seepage flow, seepage velocity and axial pressure curve, then we establish the segmented simulation equation .The dynamic simulation of coal seam excavation area and the data of gas seepage in the heading face are measured and collated by using FLAC3D software. The results of laboratory measurement of wall stress and gas flow velocity are in good agreement with the measured data. The gas seepage velocity of different parts of hard coal seam roadway area is difference under deep surrounding rock stress. It is found that the gas infiltration velocity has the characteristic of segmentation, that is, the velocity characteristic of gas seepage velocity in the top, bottom and roadway of coal roadway are different from those of roadway. At the same time, we establish the mathematical model. The discovery of the gas migration characteristics of the deep coal seam under the action of the deep surrounding rock stress can guide the coal roadway working face gas control.