基于高密度电法的煤炭采空区数值模拟及应用

The Numerical Simulation and Application of Coal Goaf Based on High Density Resistivity Method

为进一步了解高密度电法不同装置的探测效果,有效选择高密度电法在探测煤炭采空区时的采集装置,建立典型煤炭采空区地电模型进行多种装置的正反演数模计算并进行工程应用。结果表明,高密度电法中各种装置能有效反映采空区异常,但采空区的形态易受地层不均匀影响发生畸变。其中,偶极装置在查明煤炭采空区的位置和形态应用中效果最好,温纳α装置能详细确定采空区围岩电性特征和地层分层情况,结合数值模拟计算分析结果在实际铁路工程勘察中进行煤矿采空区的勘察,取得良好的效果。

In order to further understand the different devices in high density resistivity method and select effective acquisition parameters of high density electrical method in the coal goaf detection, In this paper, we establish typical geoelectric model with coal goaf and complete the numerical simulation for a variety of devices and application research.The results show that various devices in the high density resistivity method can effectively reflect the goaf abnormal response, but the morphology of goaf is easily distorted by the formation heterogeneity affecting. Among these results, the best effect of identifying complex goafs＇ location and morphological is Dipole device, Wenner device can determine the electrical characteristics of the surrounding rock and strata hierarchical in detail. Combined with the results of numerical simulation and analysis, good results have been achieved in the exploration of coal mine goaf in actual railway engineering investigation.