龙固井田断块式非典型陷落柱的探查与属性研究

Study on exploration and property of blocks of untypical collapsed coal column in Longgu Coalfield

龙固井田八采区三维地震勘探中发现一个疑似陷落柱异常区。通过施工探查钻孔,结合三维地震、电法勘探等资料对该疑似陷落柱进行了多种手段的探查和属性论证,钻孔除揭露部分地层破碎段外,煤层、标志层基本正常,而且在奥灰100 m内也未见溶洞或塌落地层,各含水层富水性未见异常。分析该异常区是一个断块式非典型陷落柱,煤层陷落高度低、主要断块内煤系地层结构基本正常、含导水性不良,3砂含水层与奥灰水联系不明显,对巷道掘进的水害威胁不大。探测结果有效指导了采区的设计生产。

A suspected collapsed coal column abnormal area was found by 3 d seismic exploration in No. 8 mining area of Longgu Coalfield. Kinds of exploration and property demonstration of collapsed coal column was conducted by drilling exploration, 3 d seismic method and electrical prospection, drilling exploration with normal coal seam and standard seam but some broken stratum, no Karst cave or cave formation within Ordovician limestone 100 m, with normal water richness of various aquifer. The abnormal area was analyzed as blocks of untypical collapsed coal column, with low coal seam collapse height, normal strata, poor water conductivity, without obvious connection between three sand aquifer and Ordovician limestone, which has little threat to water threat in mining. The detection result guided safe mining and design of the area.