高密度电法三电位电极系装置勘察适用性研究

摘要

为了对比分析高密度电法三电位电极系α、β和γ排列针对工程中常见的基岩面、充水断层以及充填型地下空洞等类型地质体适用性的差异，首先建立相关地电模型进行正演模拟计算，并对计算电阻率进行加噪二维反演，再以工程应用实例进行验证和进一步讨论。正演与实例对比结果表明：β排列在地形等干扰条件较小时对充水断层以及充填型地下空洞分辨能力较强；α排列为基岩面探测最理想装置，而当存在一定地形等干扰条件时，α、γ排列应分别为地下空洞和近直立断层勘探的最佳装置。%In order to comparatively analyze the applicability of theα,βandγarrays of high density resistivity with tri-potential electrode in prospecting several kinds of common geological bodies, such as the bedrock surface, the wa-ter-bearing fault and the filled underground hollow, first, the authors built some pertinent resistivity geologic models to calculate their resistivity and then add noise to execute two dimensional resistivity inversion, then some engineering application instances have been used to verify the forward simulation results and do further analysis. The analysis re-sults of the forward simulation and application instances show that theβarray has the best resolution in detecting the water-bearing fault and the filled underground void when there is almost no topography and other interferential condi-tions, theαarray is the ideal device of exploring the bedrock surface, but when there exist some topography interfer-ence, theαandγarrays will be the best device to detect the underground void and nearly vertical fault respectively.