底板承压水上底抽巷布置层位及围岩控制技术研究  

Research on the Upper Bottom Drainage Roadway Layout Layer Location and Surrounding Rock Control Technology of Floor Confined Water

作　　者：段东东 Duan Dongdong(Henan Coking Coal Energy Co.,Ltd.Guhanshan Mine,Henan Jiaozuo 454000)

机构地区：[1]河南焦煤能源有限公司古汉山矿,河南焦作454000

出　　处：《山东煤炭科技》2024年第7期114-119,共6页Shandong Coal Science and Technology

摘　　要：针对古汉山矿高应力、底板承压水条件下底抽巷存在围岩控制困难且易发生突水事故的问题,通过运用理论分析、数值模拟及现场试验的综合方法,研究底抽巷底板突水发生机制及其围岩破坏特征,提出底抽巷围岩综合治理技术。研究结果表明,底抽巷围岩存在的非对称塑性区使其底板隔水层厚度变小后突水风险增加;底抽巷合理的布置层位为与煤层底板垂距12 m、距回采巷道水平内错8 m;采用提高支护强度并配合注浆的手段对底抽巷协同治理;试验期间,底抽巷顶底板变形252 mm、两帮变形219 mm,提高了瓦斯抽采率,确保工作面安全开采,为相似地质条件下底抽巷的治理提供技术参考。In response to the existing problems of difficulties in controlling the surrounding rock and the easy occurrence of water inrush accidents in the bottom drainage roadway of Guhanshan Mine under high stress and floor confined water conditions,a comprehensive method of theoretical analysis,numerical simulation,and on-site testing is used to study the occurence mechanism of water inrush in the bottom drainage roadway floor and the damage characteristics of surrounding rock.A comprehensive governance technology for the surrounding rock of the bottom drainage roadway is proposed.The research results indicate that the existing asymmetric plastic zone in the surrounding rock of the bottom drainage roadway increases the risk of water inrush after the thickness of the floor waterproof layer decreases;The reasonable layout location of the bottom drainage roadway should have a vertical distance of 12 m from the coal seam floor and a horizontal internal displacement of 8 m from the stoping roadway;Adopting the method of improving support strength and cooperating with grouting to achieve coordinated governance of the bottom drainage roadway;During the experiment period,the deformation of the roof and floor of the bottom drainage roadway is 252 mm,and the deformation of the two sides is 219 mm,which improves the gas extraction rate,ensures safe mining of the working face,and provides technical reference for the governance of bottom drainage roadways under similar geological conditions.

关 键 词：底板承压水 底抽巷 底板突水 围岩控制 

分 类 号：TD745[矿业工程—矿井通风与安全]