开滦钱家营矿1495E疑似陷落柱探查及综合治理

岩溶陷落柱在我国华北石炭二叠纪煤系地层中广为分布,由于陷落柱贯穿于岩溶发育的奥灰和煤系地层之间,即使陷落柱在天然条件下不导水,但由于后期开采活动对其导水性能的改造,陷落柱往往成为奥灰与煤系地层之间联系的通道,井巷或采煤工作面一旦接近或揭露陷落柱时,可能产生突水,破坏采区划分秩序,严重影响煤矿安全生产。2009年,钱家营矿业公司在1495E风道掘进过程中首次揭露地质异常体,高度怀疑为岩溶陷落柱。该公司采取地面微动地震探测、井下直流电法和井下瞬变电磁等多种物探手段与现场钻探相结合,对地质异常体实际赋存状况进行探查。结果表明,该异常体不含水。但考虑到对物探成果必要的检验以及后续井巷工程和相邻工作面回采对异常体围岩应力平衡的破坏导致可能突水,矿方对异常体实施了钻探探查、建立密闭墙以及异常体注浆治理。治理方案的实施为矿山生产建设顺利展开奠定了基础,保证了工作面、采区科学合理划分,且为同行提供了借鉴经验。

Investigation and Comprehensive Control of Suspected Subsided Column at Qianjiaying Coalmine 1495E Air Duct,Kailuan Coalfield

Subsided columns are widely spread in North China Permo-Carboniferous coal measures strata. Since the columns penetrate into karst developed Ordovician limestone and coal measures strata, even if the columns are not water conducted under natural condition, but in virtue of mining activities can reform the water conductivity. Thus, the columns can be the linking channels between limestone and coal measures. In case of roadway or coal face near or discloses subsided column, water bursting may occur and destruct winning area division order, seriously impact coalmine safety in production. In 2009, the Qianjiaying mining company has initially revealed a geological anomalous body during the 1495E air duct advancing, and highly suspected that is a karstic subsided column. The company has used integrated geophysical prospecting means of surface microtremor seismic prospecting, underground DC electric method and underground transient electromagnetic method combined with site drilling and carried out investigation of anomalous body actual hosting condition. The result has shown that the anomalous body is non-aqueous. But considering necessary verification of geo-physical prospected results and subsequent underground engineering and neighboring coal face winning impacts on stress balance destruction of anomalous body surrounding rocks may cause water bursting, coalmine side has carried out drilling exploration, constructed sealing wall and anomalous body grouting treatment. The implement of treatment scheme has laid a foundation for smooth coalmine construction, ensured coal faces, winning districts scientific and rational division, and provided references and experiences for fellow miners.