Research on quality inspection technology of gas drainage borehole sealing hole in Sihe Coal Mine

Abstract

The quality of the hole sealing of coal seam gas drainage directly determines the efficiency of coal seam gas drainage. This paper uses the YFZ3 gas drainage borehole sealing quality tester to measure the gas drainage parameters at different locations in the borehole W33011 coal seam in Sihe Coal Mine. According to the change law of the measuring point data, it judges the quality of the sealing hole and determines the reasonable sealing depth. The research results show that Sihe Coal Mine should strengthen the training and supervision of underground plugging workers, and strictly control the details of the plugging process, such as the grouting pressure, water-cement ratio configuration and grouting volume during the plugging process. The detection borehole has a serious air leakage channel in the range of 12m~20m, and the sealing depth should be increased to 20m to increase the concentration of single-hole gas drainage.