摘要
根据FLAC3D的特点和基本原理,结合黄土边坡的变形特点,研究某典型黄土-基岩边坡的变形破坏过程,分析边坡分步开挖坡体应力和位移的变化规律,研究表明:边坡坡脚开挖,对于边坡的整体稳定性影响较为严重,很有可能引发边坡破坏;随着开挖的进行,坡体主要位移逐渐转变为水平位移,且开挖后应力在坡脚处集中。依据对边坡开挖过程中位移和应力的分析,表明随着每一级土体的开挖,边坡位移迅速增大,因此控制开挖过程中坡体位移是边坡开挖工程中重要工作,应采取对边坡坡面和坡脚加固的措施,以缓解坡脚应力集中,减小和避免坡体位移。
Based on the FLAC3D characteristics and basic principles, combined with deformational features of loess slopes, the deformation and failure process of a loess-bedrock slope and changing patterns of stress and displacement were studied. The study demonstrated that： the excavation of slope toe will seriously impact en-bloc stability of slope and possibly initiate slope failure. Along with excavation going on, the main displacement of slope gradually turned into horizontal displacement and made stress concentrated on the toe of the slope. Based on displacement and stress analyses during excavation of slope, found that in company with every step of slope excavation, displacement of slope increased rapidly, thus the displacement control is a major work during excavation. Measures should be adopted to reinforce slope surface and toe, to release slope toe stress concentration, reduce or avoid slope mass displacement.
出处
《中国煤炭地质》
2008年第9期32-35,共4页
Coal Geology of China
