摘要
基于对贵州省德江县香树坪斜坡工程地质条件分析及斜坡变形破坏特征分析,建立了缓倾坡外软硬互层型高斜坡演化概念模型,分析了斜坡演化机制,将斜坡形成及变形破坏过程分为河谷形成过程中的时效变形、滑移-逐级拉裂、滑移-弯曲-剪断3个阶段。并通过数值分析,再现了斜坡失稳机理及发生过程。基于软硬互层特性在斜坡演化过程中的作用量化分析表明,由于硬岩层限制软岩层的变形,导致坡体不易发生整体失稳。但软岩持续蠕变导致硬岩内能量积累增大,局部变形扩大,最终发生失稳破坏。
This paper analyzes the engineering geological conditions and deformation failure characteristics of Xiangshuping landslide in Dejiang county,Guizhou.It establishes the evolved conceptual model of interbedded of soft and hard low-angle rock stratum that trends outside high slope.Its formation process can be summarized as the three stages of valley formation,namely:time-dependent deformation,sliding-stepwise cracking and sliding-bending-shear break.The instability mechanism and process of slope are reappeared through the numerical analysis of valley evolution and slope failure process.The effect of the interbedded of soft and hard layer on the slope evolution is quantitatively analyzed.The conclusion is that the limitation of the hard rock layer on the deformation of soft rock layer makes it hard for slope body to entirely failure.However,the soft rock continuing to creep can lead to a significant increase in the accumulative internal energy and expansion in local deformation.This process is the cause for instability and failure of the overall slope.
出处
《工程地质学报》
CSCD
北大核心
2014年第5期883-889,共7页
Journal of Engineering Geology
基金
973计划项目(2013CB733201)资助
关键词
香树坪滑坡
成因机制概念模型软硬互层
滑移-弯曲-剪断
Xiangshuping landslide,Formation mechanism,Conceptual model,Interbedded of soft and hard slope,Sliding-bending-shear break
