Physical Modeling of Landslide Mechanism in Oblique Thick-Bedded Rock Slope: A Case Study  

作　　者：FENG Zhen YIN Yueping LI Bin YAN Jinkai 

机构地区：[1]Key Laboratory of Neotectonic movement and Geohazards, MLR, Institute of Geomechanics,Chinese Academy of Geological Sciences [2]China Institute of Geo-Environment Monitoring

出　　处：《Acta Geologica Sinica(English Edition)》2013年第4期1129-1136,共8页地质学报（英文版）

基　　金：supported and sponsored by a project of the Mechanism of Slope deformation induced by Underground Mining in Chongqing(DZLXJK201307)of the Institute of Geomechanics;projects on Research on Monitoring and Early Warning,Risk Assessment Technology for geological hazards(2012BAK10B00)of the National Key Technology R&D Program for the 12th Five-year Plan

摘　　要：The Jiweishan landslide illustrates the failure pattern of an apparent dip slide of an oblique thick-bedded rockslide. Centrifugal modeling was performed using a model slope consisting of four sets of joints to investigate the landslide initiation mechanism. Crack strain gauges pasted between the slide blocks and the base failed in sequence from the rear to the front as the centrifugal acceleration increased. When the acceleration reached 16.3g, the instantaneous failure of the key block in the front triggered the apparent dip slide of all blocks. The physical modeling results and previous studies suggest that the strength reduction in the weak layer and the failure of the key block are the main reasons for the Jiweishan landslide. The centrifuge experiment validated the previously proposed driving-blocks-key-block model of apparent dip slide in oblique with inclined bedding rock slopes. In addition, the results from limit equilibrium method and centrifuge test suggest that even though the failure of the key block in the front is instantaneous, a progressive stable-unstable transition exists.The Jiweishan landslide illustrates the failure pattern of an apparent dip slide of an oblique thick-bedded rockslide. Centrifugal modeling was performed using a model slope consisting of four sets of joints to investigate the landslide initiation mechanism. Crack strain gauges pasted between the slide blocks and the base failed in sequence from the rear to the front as the centrifugal acceleration increased. When the acceleration reached 16.3g, the instantaneous failure of the key block in the front triggered the apparent dip slide of all blocks. The physical modeling results and previous studies suggest that the strength reduction in the weak layer and the failure of the key block are the main reasons for the Jiweishan landslide. The centrifuge experiment validated the previously proposed driving-blocks-key-block model of apparent dip slide in oblique with inclined bedding rock slopes. In addition, the results from limit equilibrium method and centrifuge test suggest that even though the failure of the key block in the front is instantaneous, a progressive stable-unstable transition exists.

关 键 词：CENTRIFUGE key block driving blocks karstification belt apparent dip slide oblique thick-bedded rock slope 

分 类 号：P642.22[天文地球—工程地质学]