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Probabilistic simulation of entire process of rainfall-induced landslides using random finite element and material point methods with hydro-mechanical coupling
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2021-01-24 , DOI: 10.1016/j.compgeo.2020.103989
Xin Liu , Yu Wang

Rainfall-induced landslides are a major geohazard worldwide, which involve a complicated process, starting from rainfall infiltration, to landslide triggering and initiation, and post-failure large deformation of soils. To effectively mitigate landslide hazards, quantitative risk assessment (QRA) of landslides may be performed, which includes assessment of landslide probability and consequences. Because rainfall-induced landslide probability is controlled by rainfall infiltration and landslide triggering, while landslide consequences are often dictated by post-failure large deformation of soils, it is necessary to model the entire process of a landslide in QRA. However, most previous QRA studies did not model the entire landslide process (e.g., without modeling of rainfall infiltration or post-failure large deformation of soils) due to the difficulty of slope stability analysis methods (e.g., limit equilibrium methods and finite element method (FEM)) in modeling large deformation of soils. This study proposes a probabilistic method for simulating the entire process of rainfall-induced landslides considering spatial variability of soil properties. A two-stage method containing FEM and material point method (MPM), both with hydro-mechanical coupling, is proposed to simulate a landslide from triggering by rainfall to post-failure large deformation of soils. It quantifies landslide probability and consequences simultaneously and provides new insights for QRA of rainfall-induced landslides.



中文翻译:

液力耦合随机有限元和材料点法对降雨诱发滑坡全过程的概率模拟

降雨引起的滑坡是世界范围内的主要地质灾害,其涉及复杂的过程,从降雨入渗到触发和引发滑坡,以及发生破坏后的土壤大变形。为了有效减轻滑坡的危害,可以进行滑坡的定量风险评估(QRA),包括评估滑坡的可能性和后果。由于降雨引起的滑坡概率受降雨入渗和滑坡触发的控制,而滑坡的后果通常由失效后土壤的大变形决定,因此有必要对QRA中滑坡的整个过程进行建模。但是,以前的大多数QRA研究都没有对整个滑坡过程进行建模(例如,由于边坡稳定性分析方法(例如极限平衡法和有限元法(FEM))难以对大变形进行建模,因此没有对降雨入渗或破坏后的大变形进行建模。这项研究提出了一种概率方法,该方法考虑了土壤性质的空间变异性,可以模拟降雨诱发的滑坡的整个过程。提出了包含有限元法和材料点法(MPM)的两阶段方法,两者均采用水力耦合,以模拟从降雨触发到破坏后土壤大变形的滑坡。它可以同时量化滑坡的可能性和后果,并为降雨诱发的滑坡的QRA提供新的见解。极限变形法和有限元法(FEM))来模拟土壤的大变形。这项研究提出了一种概率方法,考虑土壤性质的空间变异性,可以模拟降雨诱发的滑坡的整个过程。提出了包含有限元法和材料点法(MPM)的两阶段方法,两者均采用水力耦合,以模拟从降雨触发到破坏后土壤大变形的滑坡。它可以同时量化滑坡的可能性和后果,并为降雨诱发的滑坡的QRA提供新的见解。极限变形法和有限元法(FEM))来模拟土壤的大变形。这项研究提出了一种概率方法,该方法考虑了土壤性质的空间变异性,可以模拟降雨诱发的滑坡的整个过程。提出了包含有限元法和材料点法(MPM)的两阶段方法,两者均采用水力耦合,以模拟从降雨触发到破坏后土壤大变形的滑坡。它可以同时量化滑坡的可能性和后果,并为降雨诱发的滑坡的QRA提供新的见解。提出了包含有限元法和材料点法(MPM)的两阶段方法,两者都采用水力耦合,以模拟从降雨触发到破坏后土壤大变形的滑坡。它可以同时量化滑坡的可能性和后果,并为降雨诱发的滑坡的QRA提供新的见解。提出了包含有限元法和材料点法(MPM)的两阶段方法,两者均采用水力耦合,以模拟从降雨触发到破坏后土壤大变形的滑坡。它可以同时量化滑坡的可能性和后果,并为降雨诱发的滑坡的QRA提供新的见解。

更新日期:2021-01-24
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