摘要
孙庄矿12661工作面处于强径流区,受底板下方含水层的威胁,导致大量的煤炭资源不能开采,大大缩短其服务年限。前期已经采取了两次井下注浆加固措施,都未达到预期效果。针对这一问题,设计采用地面多分支水平定向钻进方法对大青灰岩含水层开展精细探查和治理。结果表明,多水平定向钻进具有全方位性和针对性,在探查中发现该含水层裂隙较为发育,部分区段裂隙的张开性和连通性较好,且存在7个落差小于5m的断层,共有21个孔段循环液漏失量超过5m^(3)/h。注浆采用高速涡流制浆系统进行注浆加固,能够根据钻进过程中反馈的信息,自动实现钻井液配比,确保了注浆加固的针对性。整个注浆加固治理过程达到预期效果,成功地把大青灰岩含水层改造成一个隔水层,解放出近300万t煤炭资源,延长矿井服务年限,同时提高后续开采工作的安全性,为类似矿井开采提供借鉴经验。
The 12661 working face of Sunzhuang Mine is located in the strong runoff zone,which is threatened by the coal seam floor aquifer.Because of this,a large amount of coal resources cannot be exploited and its service life is greatly shortened.Although two underground grouting reinforcement measures had been taken in the early stage,the expected result was not achieved.In view of this problem,the paper used ground multi-branch horizontal directional drilling method to carry out fine exploration and control of the Daqing limestone aquifer.The results show that the multi-branch horizontal directional drilling is omnidirectional and targeted.It is found that fractures are well developed in the aquifer,and some fractures have good opening and connectivity.There are 7 faults with a drop of less than 5m,and the loss of circulation exceeds 5m^(3)/h in 21 well intervals.The high speed eddy current grouting system for grouting reinforcement can automatically implement the drilling fluid ratio according to the feedback information in the drilling process,ensuring the pertinence of guouting reinforcement.The whole process of grouting reinforcemet achieves the expected effect,successfully transforms the aquifer of Daqing limestone into a water-proof layer,releases neraly 3 minllion tons of coal resources,and prolongs mine life.It also improves the safety of subsequent mining,and provides reference for similar mine mining.
作者
李冲
闫兴达
Li Chong;Yan Xingda(The Third Hydrogeological Exploration Team,CNACG,Handan,Hebei 056001)
出处
《中国煤炭地质》
2022年第S01期36-39,143,共5页
Coal Geology of China
关键词
强径流区
精细探测
注浆加固
水平定向钻进
水害防治
strong runoff zone
fine exploration
grouting reinforcement
horizontal directional drilling
water hazard prevention
