松软岩层中穿层瓦斯抽采钻孔“封-护”工艺研究及工程应用  

Research and engineering application of sealing-protecting technology for gas drainage crossing hole in soft rock stratum

作　　者：李磊 Li Lei(China Coal Technology Engineering Group Chongqing Research Institute Co., Ltd., Shapingba, Chongqing 400037, China;National Coal Mine Safety Technology and Engineering Research Center, Shapingba, Chongqing 400037, China)

机构地区：[1]中煤科工集团重庆研究院有限公司 [2]国家煤矿安全技术工程研究中心

出　　处：《中国煤炭》2019年第8期45-49,共5页China Coal

摘　　要：为了解决湿度场中松软岩层膨胀对穿层钻孔的破坏作用,结合告成煤矿底抽巷中穿层钻孔松软岩层情况,采用数值模拟的方法,构建了湿度场条件下松软岩层膨胀的应力-应变模型,分别对钻孔壁膨胀应力、封孔水泥浆环支护应力及不同钻孔孔径条件下对岩层膨胀应力的影响变化情况进行研究,并根据数值模拟的结果采用"封-护"一体的封孔工艺对该矿原有的封孔工艺进行改进,通过实测法进行了工程验证。研究结果表明,"封-护"一体封孔工艺能有效解决该矿湿度场中松软岩层的膨胀应力对穿层钻孔稳定的影响。In order to solve the destructive effect of soft expansive rock stratum on crossing hole in humidity field, a stress-strain model of soft rock stratum expansion under the condition of humidity field was established by numerical simulation combined with the soft rock stratum situation of crossing hole in Gaocheng Coal Mine bottom extraction roadway, the expansive stress of borehole wall, the supporting stress of sealing cement slurry ring and the variation influence of different bore diameter on expansive stress of rock stratum were respectively studied. Based on the results of numerical simulation, the original hole sealing technology was improved by using the sealing-protecting integrated hole sealing technology and the results was verified by field engineering practice. The research results showed that the sealing-protecting integrated hole sealing technology could effectively solve the influence of the expansion stress of soft rock stratum on the stability of crossing hole in the humidity field in Gaocheng Coal Mine.

关 键 词：湿度场 松软岩层 膨胀应力 穿层钻孔 “封-护”一体封孔工艺 

分 类 号：TD712.6[矿业工程—矿井通风与安全]