Experimental investigation on the seepage law of pressure-relieved gas under the influence of mining

The stress distribution characteristics of the coal seam floor and the variation of pressure-relieved gas seepage velocity along with working face being advanced were studied experimentally. According to experimental data, the distribution rule and the influence area of abutment pressure of gob floor were analyzed. The scope of “three zones” formed by gas seepage velocity along lateral direction above the gob was determined, and the coupling rule of pressure-relieved gas was summarized. The above results provide a technical support for the spot gas extraction.