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Unsaturated seepage-stress-damage coupling and dynamic analysis of stability on discrete fractured rock slope

机译：不饱和渗流压力损伤耦合和离散裂缝岩斜率稳定性的动态分析

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摘要

Fractured rock masses are rich in discontinuous surfaces, such as joints and fissures, and therefore, rock slopes have complex mechanical properties and unsaturated permeability under rainfall conditions. In this paper, a discrete fractured slope of an unsaturated rock mass is studied. First, the coupled equations of seepage, stress and damage in three states under unsaturated conditions were derived. Then, the right bank slope of the Shanshui Reservoir in the eastern new district of Yiyang, Hunan Province, was taken as an example. The connected fracture network generated by MATLAB was introduced into COMSOL Multiphysics, and a coupled model of a discrete fracture unsaturated seepage-stress-damage field was established. Second, the PDE module of COMSOL finite element software was developed to solve and validate the three-field coupled model. The changes in different physical fields under different working conditions were compared and analyzed, leading researchers to determine that hydrodynamic pressure and shear stress influence the coupled model. Finally, the slope stability was evaluated using reliability, the weights of different random variables on slope stability were analyzed, and it was concluded that cohesion and the internal friction angle have greater and smaller impacts, respectively, providing a more accurate risk assessment of unsaturated rock slope stability.
机译：裂缝岩体富含不连续表面，如关节和裂缝，因此，岩石斜坡在降雨条件下具有复杂的机械性能和不饱和渗透性。本文研究了不饱和岩体的离散裂缝斜率。首先，衍生出在不饱和条件下三种状态的渗流，应力和损伤的耦合方程。然后，湖南省益阳东部新区山水水库的右岸坡是一个例子。 MATLAB产生的连接骨折网络被引入COMSOL多体学，并建立了离散断裂不饱和渗流 - 应力损伤场的耦合模型。其次，开发了COMSOL有限元软件的PDE模块来解决和验证三场耦合模型。比较和分析不同工作条件下不同物理领域的变化，导致研究人员，以确定流体动力学压力和剪切应力影响耦合模型。最后，使用可靠性评估斜率稳定性，分析了不同随机变量对边坡稳定性的重量，并得出结肠和内部摩擦角度分别具有更大且较小的影响，为不饱和岩石提供更准确的风险评估斜坡稳定性。

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  • 来源
    《Environmental earth sciences》 |2021年第18期|660.1-660.23|共23页
  • 作者

    Wang Shu-hong; Yang Tian-jiao; Zhang Ze; Sun Zi-han;

  • 作者单位

    Northeastern Univ Coll Resources & Civil Engn Shenyang 110819 Peoples R China|Northeastern Univ Coll Resources & Civil Engn Dept Min Engn Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Resources & Civil Engn Dept Geotech Engn Shenyang 110819 Peoples R China|Northeastern Univ Coll Resources & Civil Engn Dept Min Engn Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Resources & Civil Engn Dept Civil Engn Shenyang 110819 Peoples R China|Northeastern Univ Coll Resources & Civil Engn Dept Min Engn Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Resources & Civil Engn Dept Geotech Engn Shenyang 110819 Peoples R China|Northeastern Univ Coll Resources & Civil Engn Dept Min Engn Shenyang 110819 Liaoning Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Rainfall; Discrete fractures; Unsaturated seepage-stress-damage coupling; Stability; Reliability;

    机译：降雨;离散骨折;不饱和渗流 - 应力损伤耦合;稳定性;可靠性;

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