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通过建立回采过程中底板岩层变形破坏过程的地球物理数值模型,采用正演计算方法分析底板破坏带的电阻率变化特征,并在五矿8403工作面布置网络并行电法探测系统,进行现场观测。模拟数据和现场探测结果表明,煤层底板视电阻率值与工作面开采过程密切相关,在回采工作面后方电阻率剖面图出现明显高阻异常,其高阻异常位置与底板破坏位置相对应;在回采工作面前方出现相对低阻异常,其低阻分布位置与矿压引起的高应力区相当;随着工作面的推进,高、低阻异常同步变化。根据这种底板岩石的电阻率变化,结合矿井水文地质特征,可进行煤层底板破坏规律的动态勘探,有利于底板破坏突水的预测预报工作。
By establishing the geophysical numerical model of deformation and failure process of floor rock strata during the recovery process, the resistivity change characteristics of the floor slab are analyzed by forward calculation method. The network parallel electric detection system is arranged on the 8403 working face of Minmetals for site observation. The simulation data and on-site exploration results show that the apparent resistivity of the seam floor is closely related to the working face mining process. The apparent resistivity profile of the coal mining face shows obvious high resistance anomalies, and the location of high resistivity anomalies corresponds to the location of the floor destroying. Relatively low resistivity anomalies appear in front of the mining face, and the distribution of low resistivity is equivalent to the high stress zone caused by the rock pressure. As the working face progresses, the abnormalities of high and low resistivity change synchronously. According to the change of the resistivity of the floor rock and the hydrogeological features of the mine, it can carry out the dynamic exploration of the law of the destruction of the floor, which is propitious to the prediction and forecast of the water inrush from the floor.