1. Shanxi Tiandi Wangpo Coal Industry Co., Ltd., Jincheng 048021, China; 2. National Key Laboratory of Coal Mine Disaster Prevention and Control, Chongqing 400037, China; 3. China Coal Science and Industry Group Chongqing Research Institute Co., Ltd., Chongqing 400037, China
Abstract： Gas extraction is the fundamental way to solve the gas disaster in high gas and outburst mine. In view of the factors that restrict the effect of mine gas extraction, such as gas extraction borehole connection and pipeline water accumulation, a new type of automatic drainage hole connection technology for underground gas extraction system is developed, which combines manual water discharger with automatic water discharger and installs single hole orifice control valve. Based on the existing connection technology of drainage boreholes in Shanxi Tiandi Wangpo Coal Mine, combined with the actual situation of underground borehole drainage operation, this paper expounds and analyzes the technical principle, specific implementation process and installation mode of the new automatic drainage connection technology, and carries out the application test in the underground heading face of Wangpo Coal Mine. The research shows that the new automatic drainage hole connecting process can fully realize the predetermined goal of automatic drainage and random adjustment of single-hole extraction state. The maximum extraction concentration of single-channel groove reaches 35%, which is 5% ~ 10% higher than that of manual drainage in the early stage, and the extraction effect is significantly improved. The application research results of the new automatic drainage hole connecting process of the gas extraction system have achieved the multiple purposes of liberating the labor force, reducing the material cost and improving the extraction effect, which has a good application prospect and significance.
