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| Study and application of gas accumulation prevention measures for hydraulic punching hole in coal roadway strip treatment area |
| Chao Hongbin |
| Henan Yongjin Energy Co., Ltd., Xuchang 461670, China |
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Abstract In Yungaishan Coal Mine after the gas drainage in the strip coal seam of the pre-drainage roadway by the cross-layer drilling, the gas in the hole cannot be effectively drainaged due to the borehole blockage and other reasons. When tunneling to the position of the hydraulic punching hole, the accumulated gas is released instantaneously, which is easy to cause the gas overrun. It is a potential safety hazard for the later tunneling. In this regard, the No. 1 Mine of Yungaishan Coal Mine adopts the construction of auxiliary borehole hydraulic punching near the original drainage borehole in the bottom drainage roadway to carry out the secondary permeability enhancement, which can effectively extract the accumulated gas in the hydraulic punching hole and ensure the safety during tunneling.
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