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Seismic stability analysis of slopes with pre-existing slip surfaces

机译:已有滑动面的边坡的地震稳定性分析

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摘要

In analyzing seismic stability of a slope with upper bound limit analysis method, the slip surface is often assumed as a log-spiral or plane slip surface. However, due to the presence of a weak layer and unfavorable geological structural surface or a bedrock interface with overlying soft strata, the preexisting slip surface of the slope may be irregular and composed of a series of planes rather than strictly logspiral or plane shape. A computational model is developed for analyzing the seismic stability of slopes with pre-existing slip surfaces. This model is based on the upper bound limit analysis method and can consider the effect of anchor bolts. The soil or rock is deemed to follow the Mohr-Coulomb yield criterion. The slope is divided into multiple block elements along the slip surface. According to the displacement compatibility and the associated flow rule, a kinematic velocity field of the slope can be obtained computationally. The proposed model allows not only calculation of the rate of external work owing to the combined effect of self-weight and seismic loading, but also that of the energy dissipation rate caused by the slip surface, interfaces of block elements and anchorage effect of the anchors. Considering a direct relationship between the rate of external work and the energy dissipation rate, the expressions of yield acceleration and permanent displacement of anchored slopes can be derived. Finally, the validity of this proposed model is illustrated by analysis on three typical slopes. The results showed that the proposed model is more easily formulated and does not need to solve complex equations or time consuming iterations compared with previous methods based on the conditions of force equilibrium.
机译:在使用上限分析方法分析边坡的地震稳定性时,通常将滑动面假定为对数螺旋或平面滑动面。但是,由于存在薄弱层和不利的地质构造面或基岩界面以及上覆的软地层,该斜坡先前存在的滑动面可能是不规则的,并且由一系列平面组成,而不是严格的对数或平面形状。建立了计算模型,用于分析具有预先存在的滑动面的边坡的地震稳定性。该模型基于上限分析方法,可以考虑地脚螺栓的影响。认为土壤或岩石遵循Mohr-Coulomb屈服准则。沿滑坡将坡度分为多个块元素。根据位移相容性和相关的流动规则,可以计算出斜坡的运动速度场。所提出的模型不仅可以计算自重和地震荷载共同作用下的外部工作率,而且还可以计算出由于滑动面,块状单元的界面和锚固锚固效应而引起的能量耗散率。 。考虑到外部工作率与能量耗散率之间存在直接关系,可以推导屈服加速度和永久固结边坡永久位移的表达式。最后,通过对三种典型斜率的分析说明了该模型的有效性。结果表明,与以前的基于力平衡条件的方法相比,该模型更易于公式化,不需要求解复杂的方程式或耗时的迭代。

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  • 来源
    《山地科学学报(英文版)》 |2018年第6期|1331-1341|共11页
  • 作者单位

    Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;

    CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;

    University of Chinese Academy of Sciences, Beijing 100049, China;

    School of Advanced Geomechanical Engineering (SAGE) and Research Center of CPEC (RCC), National University of Sciences and Technology (NUST), Pakistan;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 eng
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