Abstract
Coal and gas outburst accident is one of the critical disasters restricting the safety production of coal enterprises in China. To solve the problems of low permeability and difficulty in gas extraction, a hydraulic fracturing test was carried out according to the occurrence characteristics of coal and rock gas in Pingdingshan Coal Mine No. 12; and the change law of the gas concentration and flow rate after hydraulic fracturing were obtained through long-term monitoring. Based on the test results, the effect of hydraulic fracturing on gas permeability enhancement of coal and rock was analyzed. The results have shown that the gas content decreases obviously and yet the water content increases since the hydraulic fracturing test completed, which makes the effect of gas displacement remarkably. It not only provides a reference for implementing hydraulic permeability enhancement and enhanced extraction in deep high outburst mines but also provides safe and efficient production in mining.
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