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镇江市跑马山古(老)滑坡再滑动机制分析

发表时间:2018-09-30  浏览量:114  下载量:51
全部作者: 张政,阎长虹,王威,郜泽郑
作者单位: 南京大学地球科学与工程学院;江苏省地质矿产局第三地质大队
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了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,认为该滑坡发生的本质在于古(老)滑坡体的再滑动。其中,古(老)滑坡形成的上陡下缓圈椅状坡形是地貌基础,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: 地质学;滑坡机制;跑马山;古(老)滑坡;变形监测
Title: Analysis of the reactivation mechanism of ancient (old) landslide for Paoma mountain in Zhenjiang city
Author: ZHANG Zheng, YAN Changhong, WANG Wei, GAO Zezheng
Organization: School of Earth Sciences and Engineering, Nanjing University; No. 3 Geological Party of Jiangsu Bureau of Geology and Mineral Resource
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 has appeared in the considered stable gentle slope topography. This paper takes the landslide for Paoma mountain in Zhenjiang city as 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 nature of the landslide is the re-sliding of the ancient (old) landslide. And the upper and lower steepness of the circular-chair slope formed by the ancient (old) landslide 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 are the predisposing factors.
Key words: geology; landslide mechanism; Paoma mountain; ancient (old) landslide; deformation monitoring
发表期数: 2018年9月第18期
引用格式: 张政,阎长虹,王威,等. 镇江市跑马山古(老)滑坡再滑动机制分析[J]. 中国科技论文在线精品论文,2018,11(18):1874-1882.
 
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