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| Design of drilling hole for old goaf water exploration and drainage in same layer in the process of excavation roadway along small coal pillar |
| Ma Sai |
| Zheneng Majialiang Coal Industry Co., Ltd., Jinneng Holdings Coal Group, Shuozhou 036000, China |
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Abstract The old goaf water in the same layer is a potential safety hazard for excavation roadway along small coal pillar. In order to reasonably design the drilling hole for old goaf water exploration and drainage, this paper took the design of the drilling hole for water exploration and drainage during excavation roadway along No.14203-1 small coal pillar in Majialiang Mine as the research object. Firstly, it was analyzed that the water source was mainly from the goaf of No.14204 face. In order to efficiently and accurately drain the water accumulated in the goaf, the drainage drilling holes were respectively constructed in the auxiliary transport roadway of No.14205 face and the belt transport roadway of No.14203-1 face. Reasonable drilling hole design for water exploration and drainage effectively drained the goaf water in No.14204 face, a total quantity drainage of 140 735 m3, which effectively avoided the occurrence of water outburst accident in No.14203-1 excavation face, and provided important guarantee for safe and efficient construction of excavation face.
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