深部巷道断层破碎带渗透性测试及动态监测研究

Study on Permeability Test and Dynamic Monitoring of Fault in Deep Roadway

我国超过80%的矿井突水事故与断层有关,其中大多数是原始地质条件下的非导水断层在采动影响下发生突水。断层的构造缺陷及采动效应是导致断层突水的2大重要诱因。为深入探究断层突水机制,从断层自身阻渗特性及其易受采动效应的特性出发,对深部巷道断层进行了原位压水试验及水压动态监测,研究了断层的阻渗性能,监测了其在采动条件影响下的实时安全性。结果表明:通过对比正常底板的压水试验结果,发现断层与正常底板均出现流量突变-流量递增-流量突增的过程;断层及正常底板的阻渗性能分别为0.64、2.03 MPa/m,单位厚度断层的阻渗性能明显弱于正常底板;铺子支二断层在采动过程中内部渗流场发生一定变化,但并未导致断层活化突水。

More than 80%of mine water inrush accidents are related to faults in China,most of which are non-conducting faults under primitive geological conditions that cause water inrush under the influence of mining.Structural defect and mining effect of faults are two important causes of fault water inrush.In order to deeply explore the fault water inrush mechanism,the in-situ water pressure test and hydraulic pressure dynamic monitoring of the deep roadway fault are carried out from the characteristics of fault itself impermeability and its susceptibility to mining effect.The impermeability of the fault is studied and real-time safety under the influence of mining conditions was monitored.The results show that:comparing the pressure test results of the normal bottom plate,both the fault and the normal bottom plate are found to have the process of flow mutation,flow increment and flow surge;the impermeability of the fault and normal bottom plate is 0.64 MPa/m,2.03 MPa/m,respectively,and the impermeability of the unit thickness fault is obviously weaker than that of the normal bottom plate;during the mining process,the internal seepage field of the branch fault has changed,but did not cause fault-activated water inrush.