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| Research and application of advanced pre-drainage technology in high gas coal roadway of Gaohe Coal Mine |
| Wang Huanbin |
| Shanxi Gaohe Energy Co., Ltd., Changzhi 047100, China |
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Abstract In order to solve the problem of high gas concentration and frequent over-limit in the excavation face of coal roadway in Gaohe Coal Mine, taking the construction of W3311 air intake roadway as the background, the numerical simulation and engineering analogy are comprehensively used to study the gas control technology of simultaneous excavation and drainage. The results show that the reasonable diameter of the bedding extraction borehole is 94 mm, and the optimal extraction negative pressure is 15 kPa.After the implementation of the designed advanced pre-extraction scheme, the daily gas extraction amount reaches about 670 m3, and the maximum daily gas concentration is reduced by 16.9%, which provides a reliable guarantee for the safety and efficiency of the excavation face.
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