滑坡滑带土力学特性与破坏机理分析  

Analysis of the Failure Mechanism and the Mechanical Characteristics for Sliding Zone Soil of the Landslide

作　　者：李军霞 郭永成 李壮 王岩松 李薇薇 于江浩 Li Junxia;Guo Yongcheng;Li Zhuang;Wang Yansong;Li Weiwei;Yu Jianghao(China Energy Engineering Group Tianjin Electric Power Design Institute Co.,Ltd.)

机构地区：[1]中国能源建设集团天津电力设计院有限公司,天津市300400

出　　处：《勘察科学技术》2024年第S1期79-83,共5页Site Investigation Science and Technology

摘　　要：该文基于滑坡滑带土直剪蠕变与快剪强度试验,采用莫尔-库伦强度准则获取强度指标,分析了滑带土的强度特性及蠕变特性,揭示了滑坡发生机理。试验结果表明:该滑坡滑带土黏粒主要为绿泥石,其强度随含水率的增加而降低,且黏聚力变化明显;长期强度随时间的推移而降低,黏聚力对剪切蠕变的影响大于内摩擦角;滑带土具有随时间推移变形量增大而强度降低的流变特性;滑坡发生经历蠕滑、挤压、滑动阶段,是滑带土物理力学性质宏观变形强度效应的累积过程,也是与时间效应相关的长期缓慢渐进破坏的过程。滑带土强度、变形特性和破坏机理对滑坡稳定性和防治研究具有重要的工程意义。Based on the direct shear creep and fast shear strength tests of the soil in the landslide sliding zone,the strength index is obtained by using Mohr-Coulomb strength criterion to analyze the strength and creep characteristics of the sliding zone soil and to reveal the mechanism of landslide occurrence.Test results show that the clay particles of sliding zone soil are mainly chlorite hydrophilic mineral,for which strength decreases with the increase of water content,and the cohesion changes obviously while the longterm strength decreases with the passage of time,and the cohesion has greater influence on shear creep than the internal friction angle.The sliding zone soil has the rheological characteristics which show that the deformation increases and the strength decreases with time.The landslide occurs through creep,compression and sliding stages which is a cumulative process of macro-deformation strength effect of sliding zone soil physical and mechanical properties,as well as a long-term slow and gradual failure process related to time effect.The strength,deformation characteristics and failure mechanism of sliding zone soil are of great engineering significance to the study of landslide stability and prevention.

关 键 词：滑带土 强度特性 剪切蠕变 发生机理 

分 类 号：P642.22[天文地球—工程地质学]