牵引式滑坡的破坏机制及其加固措施探讨 ——以某高速公路牵引式滑坡为例

›› 2013, Vol. 34 ›› Issue (12): 3587-3593.

牵引式滑坡的破坏机制及其加固措施探讨 ——以某高速公路牵引式滑坡为例

宋东日¹，任伟中¹，沈波²，徐志忠²，周英博¹，张思渊¹

1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071；2.恩施州公路管理局，湖北恩施 445000

收稿日期:2012-09-21 出版日期:2013-12-10 发布日期:2013-12-19
作者简介:宋东日，男，1987年生，硕士研究生，主要从事岩土力学与边坡稳定性方面的研究工作
基金资助:
中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室重点项目（No. SKL208064）；中国科学院知识创新工程重要方向项目（No. KZCXZ-YW-151）。

Discussion on failure mechanism of retrogressive landslide and its reinforcement measures: taking a certain expressway retrogressive landslide for example

SONG Dong-ri¹, REN Wei-zhongP¹, SHEN Bo², XU Zhi-zhong², ZHOU Ying-bo¹, ZHANG Si-yuan¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Highway Authority of Enshi Autonomous Prefecture, Enshi, Hubei 445000, China

Received:2012-09-21 Online:2013-12-10 Published:2013-12-19

摘要/Abstract

摘要： 牵引式滑坡在山区公路滑坡中占有相当的比重，其治理工程往往耗资巨大、环境破坏严重。针对某高速公路牵引式滑坡，通过地质调查、变形迹象分析、岩土体应力-应变分析及数值模拟等方法，指出具体破坏机制为：（1）坡脚开挖致使阻滑关键块体缺失，应力集中导致剪切应变软化；（2）地表降水与地下水对岩土体物理力学性能的改造；（3）滑体变形不协调，导致拉裂缝产生，滑坡后缘得以继续向后扩展。目前监测表明，已施工的组合加固措施效果良好。最后讨论挖方引起的牵引式滑坡的工程地质特征，对牵引式滑坡进行评价应坚持安全系数分区原则，滑坡总体加固应按安全系数控制，同时对后缘加固按位移控制。

关键词: 牵引式滑坡, 滑坡范围, 加固措施, 位移控制

Abstract: The retrogressive landslide occupies a considerable proportion among expressway landslides in the mountain area. The reinforcement projects often cost enormously and the environment around is usually damaged severely. Taking a certain expressway retrogressive landslide for example, through approaches of geological survey, deformation investigation, stress-strain behavior analysis and numerical modeling, the failure mechanism is confirmed as follows: (1) the loss of resisting key block is caused by slope foot excavation, shear strain softening is induced by stress concentration; (2) physico-mechanical properties alternation of the rock and soil mass are remolded by the surface rainfall and groundwater; (3) tensile cracks are fromed deformation incompatibility and its expanding backward. The monitoring results show that the applied combined reinforcement measures work well. The geological characteristics of excavation-induced retrogressive landslides are discussed. A principle that “the safety factor should be calculated by section should use to evaluate retrogressive landslide; the reinforcement of the whole landslide should be controlled by the predetermined safety factor; while the reinforcement of landslide rear should be controlled by displacement.

Key words: retrogressive landslide, landslide boundary, reinforcement measures, displacement control

中图分类号:

U 416

宋东日，任伟中，沈波，徐志忠，周英博，张思渊，. 牵引式滑坡的破坏机制及其加固措施探讨 ——以某高速公路牵引式滑坡为例[J]. , 2013, 34(12): 3587-3593.

SONG Dong-ri , REN Wei-zhongP , SHEN Bo , XU Zhi-zhong , ZHOU Ying-bo , ZHANG Si-yuan . Discussion on failure mechanism of retrogressive landslide and its reinforcement measures: taking a certain expressway retrogressive landslide for example[J]. , 2013, 34(12): 3587-3593.

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