复杂岩体水渗流地电场响应试验分析

Experimental on geoelectric field of water seepage of complex rock mass

采用715m埋深的矿井巷道揭露的煤系地层和正断层作为试验对象,由巷道和其侧帮水平钻孔构成相互垂直的二条电法观测线,在断层下盘进行注水,时空域观测二条测线上岩体的地电场响应.试验中动态反演电阻率图像可以跟踪水体渗流运动过程,判定岩体中断层导水性能及其控水作用;自然电位随着岩体内注入水体逼近电极而上升,停止注水而下降,自然电位指示岩体水体渗流的波动规律;激励电流的升降与出水点位置相关,距离出水点越近激励电流上升越明显.试验表明对于受断层控制的深部复杂岩体的水体渗流,可以运用地电场的时空特性进行监测评价.动态地电场监测技术,可用于复杂岩体的导、隔水性能研究.

The actual normal fault and coal measure strata are exposed by laneway in mine used as an experimental object, arrange two survey lines perpendicular each other in the laneway and the observation bores. Get through water injection in the fault footwall zone by the water injection bore. The temporal-spatial domain parameters of geo- electric field in the seepage of the rock mass, Based on the characteristics of parameters apparent of the geo-electric field： The dynamic inversion resistivity images have the ability to track and identify the seepage process, and iudging the water transmitting ability and inrush controlling of rock mass; Natural potential rising trend when water approaches, and dropping trend when stopping water injection; it indicated fluctuation pattern of water in seepage process; The exciting current has raised mutations when the water inrush, and the water inrush location as close as obviously. Experiments show the spatial synchronization monitoring technology of geo-electric field is adopted and assessed in the water seepage of deep complex rock controlled by fault; and the real-time monitoring technology of geo-electric field can be used in the water conducted and resisting property study of complex rock.