三维高密度电法在不稳定斜坡勘查中的应用

Application of 3D electrical resistivity tomography in the exploration of unstable slope

高密度电法近年来在地质灾害评价中得到了广泛应用,三维高密度电法做到了真三维测量,具有数据信息量大、布极受场地限制小等优势,通过三维反演可获得地下介质的三维电阻率模型,结合地质、物性资料可推断解释出具有明显电性差异的地质体。本文通过在西二道河不稳定斜坡开展三维高密度电法勘查,划分出尾矿坝和基底间界面,对坝体堆积物厚度进行了计算,结合二维反演电阻率断面与从三维反演电阻率模型提取的电阻率断面进行对比,分析二者的异同及影响因素,总结了两种工作方法的优势与局限性。

High-density electrical tomography has been widely used in geological hazard evaluation in recent years.3D electrical resistivity tomography has achieved true 3D measurement,and has the advantages of large amount of data information and limited distribution of poles by the site.3D electrical resistivity tomography of underground media can be obtained through 3D inversion,and geological bodies with obvious electrical differences can be inferred and interpreted in combination with geological and physical data.In this paper,the 3D electrical resistivity tomography prospecting is carried out on the unstable slope of the Xierdaohe,the interface between the tailings dam and the basement is divided,the thickness of the dam deposit is calculated,and the 2D inversion resistivity section is compared with the resistivity section extracted from the 3D inversion resistivity model,the similarities and differences between the two and the influencing factors are analyzed,and the advantages and limita-tions of the two working methods are summarized.