高密度电阻率法探测汶川地震造成的不稳定斜坡

High density resistivity method detect unstable slope created by Wenchuang earthquake

汶川大地震中,山体开裂,多处出现严重滑坡现象,并造成掩埋村庄或道路的严重次生灾害。地震过后还有大量的不稳定斜坡存在。这类不稳定的结构随时都有可能引发新的灾难。本文以灾后某不稳定斜坡为例,使用高密度电阻率法对不稳定斜坡区的异常特征进行了研究,并对获取的视电阻率断面进行了地形校正。结果表明:对于沉积岩地区的不稳定斜坡,不稳定斜坡与滑床间存在明显的电性差异,根据经过地形改正的不稳定斜坡区视电阻率异常特征剖面图,更清晰和直观显示了不稳定斜坡体的纵横向展布、主滑动面的位置与埋深,进而可圈定不稳定斜坡体的规模,为不稳定斜坡治理提供可靠的地球物理依据。

Some serious landslides and crack in mountain can be found in Wenchuan earthquake.It can made serious disaster.For example,it can bury village or road.After the Wenchuan earthquake,many unstable slopes were bequeathed.This kind of unstable slope can engender new disaster at any moment.In this paper,Taking an unstable slope as an example,we use high density resistivity method to research the anomaly characteristics of unstable slopes and terrain correction for apparent resistivity section.The results show that,for unstable slope in sedimentary areas,there exists obvious electric difference between unstable slopes and slide bed.The characteristics of apparent resistivity anomaly and section with topographic correction in the unstable slope area clearly and intuitively shows the vertical and lateral distribution of unstable slope and the position and depth of main sliding plane.Therefore,the size of unstable slope mass can be delineated as the reliable geophysical basis for unstable slope contro1.