Post-failure analysis of slope under seismic motion by random material point method

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<p>Spatial variability of soil properties is considered as a major source of uncertainties in geotechnical engineering. Effects of spatial variability of soil properties on slope stability have received considerable research attention in the literatures. However, it is worth noting that the consequence of a landslide is often determined by the transportation and final deposition of the sliding soil mass, which is also significantly affected by the spatial variability of soil. At the same time, seismic excitation or earthquake can trigger large landslides. Few literatures studied the effects of seismic motion on the post-failure behavior of slope considering the spatial variability of soil properties. In this paper, the effects of seismic motion on the runout characteristics of post-failure slope had been studied using random material point method (RMPM). First, the deterministic analysis was investigated, revealing that the seismic action increases the runout characteristics of the post-failure slope, the runout distance, the volume of the sliding mass, and the influence distance. Secondly, the spatial variability was considered, and 1500 random field realizations were simulated. It was found that the spatial variability had a promoting effect of seismic motion on the runout characteristics of the post-failure slope.</p>

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