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Plowing mechanism of rapid flow-like loess landslides: Insights from MPM modeling
Engineering Geology ( IF 7.4 ) Pub Date : 2024-04-29 , DOI: 10.1016/j.enggeo.2024.107532 Wei Shen , Jianbing Peng , Zhitian Qiao , Tonglu Li , Ping Li , Xinglai Sun , Yuqi Chen , Jiheng Li
Engineering Geology ( IF 7.4 ) Pub Date : 2024-04-29 , DOI: 10.1016/j.enggeo.2024.107532 Wei Shen , Jianbing Peng , Zhitian Qiao , Tonglu Li , Ping Li , Xinglai Sun , Yuqi Chen , Jiheng Li
Plowing refers to the phenomenon by which a landslide displaces and pushes the path material forward. Despite its importance in shaping the dynamics of many rapid flow-like loess landslides, the mechanism of plowing is not fully understood. Therefore, this paper presents an improved numerical model based on the material point method (MPM). This model takes into account the interactions between the landslide mass and the path material. The reliability of this model was validated by simulating two granular column collapse experiments involving interaction with an erodible mass. The model was then applied to analyze the plowing dynamics of the Ximiaodian loess landslide in Jingyang County, Shaanxi Province, China. A series of well-designed simulations were conducted to investigate this specific landslide event, contributing to a deeper understanding of the plowing phenomenon in loess landslides. The simulation results show that our model can satisfactorily simulate the plowing process of the Ximiaodian landslide. The plowing process of a rapid-flow loess landslide is proposed to consist of four distinct stages: 1) the collision stage, when the landslide strikes the terrace, resulting in the bending of its strata; 2) the shear failure stage, characterized by significant plastic shear deformation within the bent strata, resulting in the formation of multiple shear failure planes; 3) the steady plowing stage, during which the deformation structure in the affected terrace stabilizes and plowing continues in a steady pattern; and 4) the stopping stage, when the propagation of the disturbed terrace gradually stops. Furthermore, the disturbed terrace zone exhibits three distinct deformation structures. In the rear part, a stable zone develops where the terrace layers are compressed. However, due to the compressive forces exerted by the overlying loess, no significant shear deformation is observed. The middle part is the shear failure zone, characterized by the formation of multiple shear failure planes. The front part is the upheaval zone, where the terrace layers are slightly bent and tilted.
更新日期：2024-04-29
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