淮南板集煤矿F512断层导水性分析及地面注浆加固

板集煤矿F512断层落差70m,存在着导通上覆新生界松散层水与下伏太原组岩溶水的威胁,同时,断层带的破碎岩体也将对巷道掘进和支护带来困难。该矿先后施工了3个水文地质钻孔进行抽水和压水试验,根据岩心鉴定成果和岩石RQD值,认为断层带的岩心较为破碎;依据抽水过程中的流量变化、水位降深值和水位恢复值等指标及压水试验中透水率分析,发现该断层的导水性较差,具有弱渗透性。参考相邻矿区的经验,决定对断层破碎岩体采用地面注浆方法进行加固。整个工种注入水泥浆1 600m3,破碎岩体得到了有效加固,巷道掘进顺利通过了F512断层。

Transmissibility Analysis of Fault512 in Banji Coalmine and Surface Grouting Practice

The throw of F512 in the Banji coalmine is 70m,thus the conductive threat from overlying Cenozoic loose bed aquifer and underlying Taiyuan Formation karstic aquifer is existed.Meanwhile,fault zone fractured rock masses also bring on difficulties in roadway excavation and supporting.3 hydrogeological boreholes have drilled one after another for pumping and packer permeability tests.According to drilling core identified results and rock RQD values,have considered that rocks in the fault zone area are rather f...