卢应发, 刘德富, 石峻峰. 2015: 边坡渐进破坏机理及稳定性分析. 工程地质学报, 23(s1): 452-464. DOI: 10.13544/j.cnki.jeg.2015.s1.070
    引用本文: 卢应发, 刘德富, 石峻峰. 2015: 边坡渐进破坏机理及稳定性分析. 工程地质学报, 23(s1): 452-464. DOI: 10.13544/j.cnki.jeg.2015.s1.070
    LU Yingfa, LIU Defu, SHI Junfeng. 2015: MECHANISM AND STABILITY ANALYSES OF PROGRESSIVE FAILURE OF LANDSLIDE. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 452-464. DOI: 10.13544/j.cnki.jeg.2015.s1.070
    Citation: LU Yingfa, LIU Defu, SHI Junfeng. 2015: MECHANISM AND STABILITY ANALYSES OF PROGRESSIVE FAILURE OF LANDSLIDE. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 452-464. DOI: 10.13544/j.cnki.jeg.2015.s1.070

    边坡渐进破坏机理及稳定性分析

    MECHANISM AND STABILITY ANALYSES OF PROGRESSIVE FAILURE OF LANDSLIDE

    • 摘要: 在滑坡稳定分析基础上, 建立了推移式滑坡渐进破坏分析法。在机理分析基础上提出了临界状态条块或单元和相应决定方法, 以及两种破坏模式, 模式Ⅰ:整个滑体沿弱面发生破坏, 模式Ⅱ:后缘沿弱面发生破坏, 而前缘局部沿滑体发生剪切破坏, 两种破坏模式临界状态点逐步由后缘向前缘移动。研究了推移式滑坡变形规律, 提出了模式Ⅰ和Ⅱ渐进破坏过程中, 滑面上每一点的时间与位移均呈现不同的S形曲线特征, 对于整个滑体而言, 滑面上每一点的位移与高度关系, 在不同时刻呈现不同的抛物线特征, 提出了滑面位移与时间的关系呈两种类型:非稳定时间曲线和稳定时间曲线。研究了现行滑坡稳定性系数计算特点, 提出了稳定性计算综合下滑力-抗滑力、主推力和基于位移变化的方法。研究了滑坡运动特点, 提出了主滑方向的定义。研究了滑坡有限元稳定计算, 分析了引起滑坡有限元计算不收敛原因, 提出了滑坡有限元计算滑面边界法, 滑面既可以施加理想弹塑性边界, 计算稳定系数可和传统的极限状态相比较, 又可施加不同的应力-应变边界, 获得真实的应力和位移场, 并计算相对应的稳定系数, 对于潜在滑面以概率法、能量法和现场勘查法确定。

       

      Abstract: Based on the research of landslide stability analyses, the new failure stability analyses of thrust-type landslide are established. Based on the mechanism of thrust-type landslide, critical stresses slice block(SB)(or element) and relative determinations are suggested. Two failure modes are proposed for the progressive movement landslide, the modeⅠ:the whole slope failure is occurred along the soft-weak layer, the modeⅡ:The landslide failure is occurred in the trailing's edges along the soft-weak layer, but its ahead shear failure is happened along the sliding body. The critical stress state moves from the behind zone to the front zone of landslide progressively. TheScurve property of time and deformation relationship is shown for the different points on the sliding surface during deformation period, and a parabolic curve is presented for the relationship of deformation of different points on the sliding suface and height of landslide by means of results of landslide mechanism. The two kinds of curve properties between time and deformation are proposed based on the mechanical behavior classification of rock-soil mass: unstable and stable time and deformation curve. The characteristics of current stability analyses is researched, the stability analysis method of comprehensive sliding force and anti-sliding force, main thrust force method and displacement method based on deformation are suggested. The movement of landslide is studied, the definition of main sliding direction of landslide is proposed. The cause of no convergence is analyzed for FEM, a new method to take the sliding face as a boundary condition of FEM is proposed for landslide stability analyses, the boundary condition of sliding surface can described not only as perfect elasto-plastic model(PEPM), but also the new constitutive theories(JCM).The results of stability analyses by PEPM can take the comparisons with the traditional slice method, the real stress and strain fields can obtained by other models for landslide. The determination of potential sliding surface is determinate by probability method, energy principle and in-situ exploration method.

       

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