孤岛综放工作面水体探测及突水危险性研究

Research on water body detection and water inrush risk of isolated full-mechanized working face

以济煤23101孤岛工作面为研究对象,运用力学模型分析、多种经验公式计算及数值模拟方法分析孤岛工作面及相邻工作面采动前后覆岩裂隙发育及贯通性,结合调查资料、地面和井下瞬变电磁探测结果研究孤岛工作面上方水体及相邻采空区积水赋存规律,并采用钻探方法针对理论、物探所分析的采空区积水进行现场验证。结果表明:23101工作面上覆岩层存在顶板裂隙水,其上方相邻济源三矿21051工作面存在较多老空水;当23101工作面未回采时,其下方相邻23001工作面平均导水裂隙发育高度为58.43 m、其上方相邻济源三矿23051工作面平均导水裂隙发育高度为57.31 m,且两者并未贯通;当23101工作面回采后,23101工作面裂隙发育高度平均为60.94 m,可与上方相邻济源三矿21051工作面断裂带贯通,21051老空水可威胁到23101工作面正常回采。因此,对23101工作面顶板裂隙水及相邻工作面老空水进行超前排放是保障安全回采的必要措施。

This paper takes Jimei 23101 isolated working face as an example, uses mechanical model analysis, multiple empirical formula calculations and numerical simulation methods to analyze the development and penetration of overlying rock fissures before and after the mining of isolated working faces and adjacent working faces. Combining survey data, ground and underground transient electromagnetic detection results are used to analyze the occurrence of water accumulation in the water above the isolated working face and adjacent goaves, and using drilling methods to verify on-site water accumulation in the goaf analyzed by theory and geophysical prospecting. The results of geophysical, geochemical, and drilling show that there is a roof fissure in the overlying strata of the 23101 working face, and a lot of gob water in the 21051 working face of the adjacent Jiyuan No.3 mine above it;when the 23101 working face is not mined, the average development height of water-conducting fissures in the adjacent 23001working face below it is 58.43 m, and the average development height of water-conducting fissures in the 23051 working face of the adjacent Jiyuan No.3 mine above it is 57.31 m. And the two are not connected;when the 23101 working face is stopped, the average height of cracks in the 23101 working face is 60.94 m, it can be connected to the fissure zone of 21051 working face of the adjacent Jiyuan No.3 mine above, the gob water of the 21051 working face can threaten the normal mining of the 23101working face. Therefore, the advanced discharge of roof fissure water in 23101 working face and old goaf water in the corresponding working face is a necessary measure to ensure safe mining.