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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。
During the Wenchuan earthquake, mountains cracked and suffered serious landslides and caused serious secondary disasters in buried villages or roads. There are a lot of unstable slopes after the earthquake. Such unstable structures can trigger new disasters at any time. In this paper, an unstable slope after an earthquake is taken as an example to study the anomalous characteristics of the unstable slope region by using the high-density resistivity method, and the topographic correction of the obtained apparent resistivity section is carried out. The results show that there is a significant electrical difference between the unstable slope and the slide bed for the unstable slope in the sedimentary area. According to the profile of the apparent resistivity anomaly characteristic in the unstable slope area after the topography correction, the instability is more clearly and directly visualized Longitudinal and transverse distribution of the slope body, the location and depth of the main sliding surface, and then the scale of the unstable slope body can be delineated to provide a reliable geophysical basis for unstable slope management.