Abstract
An earthquake-induced landslide, mainly affected by seismic movement, is a frequent large-scale geological hazard in hydraulic engineering. This paper proposed a rate-dependent strain-softened micromechanical contact model and implemented it in discrete element method code, namely, PFC. Using the PFC-FLAC coupling scheme, the Hongshiyan earthquake landslide is analyzed as a case study. The influence of the strain rate, damping, and topographic effect is discussed. The results indicate that the rate-dependent micromechanical model can give a reasonable seismic-induced failure process compared with the in situ situation and provide a numerical technique for earthquake-induced landslide analysis and rockfall hazard prediction.
Highlights
Earthquake-induced rock landslide is a common type of geological disaster that causes great loss to human life and property
A dynamic soft-bond model considering the strain rate effect is developed to simulate the rock mass based on the Hongshiyan earthquake-induced landslide in Yunnan Province, China
The dynamic soft-bond contact model which can reflect the strain softening and strain rate strengthening effect is established by using the continuous-discontinuous coupling method, and numerical simulations are carried out to analyze the Hongshiyan earthquake-induced landslide
Summary
Earthquake-induced rock landslide is a common type of geological disaster that causes great loss to human life and property. Current research on landslides is aimed at defining the degree of difficulty of predicting a landslide based on macroscopic factors of slope stability, as well as the intensity of earthquake and rainfall, so as to gain advanced warning. This method is only an approximation and is often inaccurate for specific slopes [1, 2]. A dynamic soft-bond model considering the strain rate effect is developed to simulate the rock mass based on the Hongshiyan earthquake-induced landslide in Yunnan Province, China. According to the field investigation data, a continuous-discontinuous numerical model is established, through which a reasonable combination of damping values for the Hongshiyan landslide is discussed, and the start-up time, damage form, movement, and accumulation process of the landslide under the action of seismic waves are simulated and analyzed
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