镇江市跑马山古(老)滑坡再滑动机制分析
首发时间:2018-04-24
摘要:近年来随着长江下游地区极端强降雨天气的增多,原本认为稳定的缓坡地形发生越来越多的蠕动滑坡。本文以镇江市跑马山滑坡为例,重点分析该地区的新构造运动背景,并从场地的工程地质特征、地形地貌、地层岩性等角度,结合自动化变形监测,对滑坡变形阶段和成因机制进行分析。认为古(老)滑坡再滑动是导致滑坡发生的关键。其中古(老)滑坡体是地貌基础,滑动带(或软弱结构面)松散土体提供地下水渗透及赋存空间,强降雨形成的"暂时性承压水"和不合理的人为工程活动是诱发因素。
关键词: 地质工程 滑坡机制 跑马山 古(老)滑坡 变形监测
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Analysis of the reactivation mechanism of ancient(old) landslide for Paoma Mountain in Zhenjiang city
Abstract:In recent years, with an increasing number of the extremely heavy rainfall in the lower reaches of the Yangtze River, more and more creep landslide of gentle slope topography appeared. This paper takes the landslide for Paoma Mountain in Zhenjiang city, for example. The new tectonic movement background of the region is analyzed emphatically. Based on the engineering geological characteristics, landform, formation lithology, and automatic deformation monitoring, we analyzed the deformation state and genetic mechanism of the landslide. As a result, it is considered that the reactivation of the ancient(old) landslideis the key of the landslide.And the ancient(old) landslide mass is the geomorphological foundation, the loose soil of the slip zone(or weak structural plane) provides space for groundwater penetration and groundwater storage,the "temporary confined water" formed by heavy rainfall and the unreasonable manmade projects is the predisposing factor.
Keywords: Geological engineering Landslide mechanism Paoma Mountain Ancient(old)landslide Deformation monitoring
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