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Unsaturated seepage–stress–damage coupling and dynamic analysis of stability on discrete fractured rock slope
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-09-21 , DOI: 10.1007/s12665-021-09647-x
Shu-hong Wang 1, 2 , Tian-jiao Yang 2, 3 , Zi-han Sun 2, 3 , Ze Zhang 2, 4
Affiliation  

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.



中文翻译:

离散裂隙岩体边坡不饱和渗流-应力-损伤耦合及稳定性动力分析

裂隙岩体富含节理、裂隙等不连续面,因此,在降雨条件下,岩质边坡具有复杂的力学性质和非饱和渗透性。在本文中,研究了非饱和岩体的离散裂隙边坡。首先,推导了非饱和条件下三种状态下渗流、应力和损伤的耦合方程。以湖南省益阳市东部新区山水水库右岸坡为例。将MATLAB生成的连通裂缝网络引入COMSOL Multiphysics,建立离散裂缝非饱和渗流-应力-损伤场耦合模型。其次,开发了 COMSOL 有限元软件的 PDE 模块来求解和验证三场耦合模型。对不同工况下不同物理场的变化进行比较和分析,引导研究人员确定动水压力和剪应力对耦合模型的影响。最后,利用可靠性评价边坡稳定性,分析不同随机变量对边坡稳定性的权重,得出黏聚力和内摩擦角分别影响较大和较小的结论,为非饱和岩体风险评估提供更准确的依据。边坡稳定性。

更新日期:2021-09-22
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