前缘反倾式锁固型滑坡变形破坏模式及失稳机理  

Deformation Failure Mode and Instability Mechanism of Front Anti-tilt Locked Landslide

作　　者：耿正 刘汉东[1,2] 王四巍 李冬冬[1,2] 张艺冰 张世英[1,2] 刘佳宾 GENG Zheng;LIU Han-dong;WANG Si-wei;LI Dong-dong;ZHANG Yi-bing;ZHANG Shi-ying;LIU Jia-bin(Institute of Geotechnical Mechanics and Hydraulic Structure,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Henan Key Laboratory of Geotechnical and Structure Engineering,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学岩土力学与水工结构研究院,郑州450045 [2]河南省岩土力学与结构工程重点实验室,郑州450045

出　　处：《科学技术与工程》2020年第9期3501-3508,共8页Science Technology and Engineering

基　　金：国家自然科学基金(U1704243)。

摘　　要：了解滑坡的失稳机理和破坏模式是对其进行预防预报的前提。采用物理模型试验方法,以降雨为触发条件,进行多次模型试验,记录前缘反倾式锁固型边坡在不同坡面形态时的变形破坏现象,研究该类边坡的失稳机理及破坏模式。研究结果表明:前缘反倾式锁固型边坡为后缘推移式滑动破坏,该类边坡失稳始于边坡后缘,其破坏模式为开始降雨→雨水从坡面入渗,边坡土体强度降低→后缘土体发生沉降→前缘土体发生垮塌→坡体后缘持续下沉,推动边坡底部土体向前滑动-坡体前缘出现推挤隆升现象-边坡整体失稳破坏;前缘反倾式锁固型边坡发生整体失稳的根本原因是边坡前缘土体强度降低及垮塌,致其无法提供足够的抗滑力,边坡发生整体失稳。研究成果对此类滑坡的预防预报具有一定的指导意义。Understanding the instability mechanism and failure mode of landslide is the precondition for the prevention and prediction. Using physical model test method and rainfall as trigger condition, many model tests were carried out. The deformation and failure phenomena of front anti-dip locking slopes(FALL) in different slope morphologies were recorded, and the failure mechanism and failure mode of such slopes were studied. Results show that the FALL is the trailing edge sliding landslide. The instability of this kind of slope begins at the trailing edge of the slope, and its failure mode can be described as follows: raining starting→rainwater infiltration from slope weakening the slope soil→back edge soil subsiding→front soil collapsing→continuous subsidence of the back edge of the slope promoting the forward sliding of the soil at the bottom of the slope→pushing and uplifting at the front of slope→integral instability of slope failing. The main reason for the overall instability of the FALL is the decrease and collapse in soil strength of the front, which makes it unable to provide enough anti-sliding force and the overall instability of the slope. Results of this study provide a reference to the prevention and prediction of such landslides.

关 键 词：前缘反倾式锁固型滑坡 破坏模式 失稳机理 降雨诱发 

分 类 号：P642[天文地球—工程地质学]