川东红层缓倾岩质滑坡的演化过程及其识别标志探讨

发布时间：2018-07-04 20:03

本文选题：红层 + 川东　；参考：《工程地质学报》2017年02期

【摘要】：通过对典型案例的调查研究,总结提出了川东缓倾顺层岩质滑坡的变形演化阶段划分理论,并提出不同演化阶段下的识别标志特征。结论表明:(1)初期短距离启动阶段,斜坡后缘主要表现为深大裂隙;(2)中期槽谷扩张阶段,斜坡后缘主要表现为沟槽、拉陷槽或者斜坡具有汇水聚集发生剧滑的地形特征,如圈椅状地形、三沟环绕或双沟同源地形、后缘洼地地形等。(3)大型、特大型顺层岩质滑坡大多为斜坡二次、甚至三次启动滑动的结果,识别古(老)滑坡是圈定大型、特大型顺层岩质滑坡的重要途径之一。(4)在地调详查中,应特别注重对斜坡微地貌和后缘拉张破坏区的调查,重点排查初期短距离拉槽启动阶段及中期槽谷扩张阶段的隐伏性斜坡。本研究为区内滑坡的预测预防和大型、顺层岩质滑坡隐患点的判定提供指导。
[Abstract]:Based on the investigation and study of typical cases, this paper summarizes and puts forward the theory of dividing the deformation and evolution stages of gently inclined bedding rock landslides in East Sichuan, and puts forward the identification mark characteristics under different evolution stages. The conclusions are as follows: (1) in the initial short distance start-up stage, the slope rear margin is mainly characterized by deep and large fractures, (2) in the middle trough valley expansion stage, the slope rear edge is mainly characterized by a trench, a pull trough or a slope with the topographic characteristics of water catchment and sharp slip. For example, the arm-shaped terrain, the congener topography of the three trenches or the Shuanggou, the topography of the lower edge of the back edge, etc. (3) the large and super large rock landslides are mostly the results of the slope two times, or even three times starting the sliding, and the ancient (old) landslide is recognized as the delineated large scale. One of the important approaches to the extra-large bedding rock landslide. (4) in the detailed investigation of geological survey, special attention should be paid to the investigation of the slope microtopography and the extension damage area of the rear edge. The hidden slopes of the initial short-distance trench start-up stage and the mid-period trough valley expansion stage were investigated. This study provides guidance for the prediction and prevention of landslide in the area and the determination of hidden danger points of large and bedding rock landslides.
【作者单位】：中国地质调查局地质灾害防治技术中心;中国地质科学院探矿工艺研究所;
【基金】：中国地质调查局二级项目(DD20160278)资助
【分类号】：P642.22

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