基于不同装置的高密度电法对低阻填充溶洞探测的对比

Correlation of Detection of Karst Caverns with Low-Resistivity Fillings Based on High-Density Electrical Method with Different Devices

高密度电法勘探中,不同条件下的溶洞起反演电阻率特征有差异,溶洞为空洞时反演电阻率表现为高阻,充满低阻物质时表现为低阻,而当低阻物质含量不同时各个装置的探测效果会有不同。为了比较高密度电法不同装置对低阻填充溶洞的探测效果,构建低阻物质含量不同的低阻溶洞,正演计算了不同装置下的视电阻率,利用最小二乘法对模型的地电断面进行反演。

Empty caverns and caverns filled with low-resistivity material are different in inversion of resistivity characteristics from high-density electrical method.Inversion of resistivity characteristics for empty caverns occurs in the form of high resistance,while inversion of resistivity characteristics for caverns filled with low-resistivity material occurs in the form of low resistance.And different devices have different detection effects for different low-resistivity filling material content.This study makes forward calculation for the apparent resistivity of different devices and inversion of the geoelectrical cross section of the model using the least squares.