Method\ for analyzing whole process of soil slope landslide

Abstract

The invention provides a method for analyzing the whole process of soil slope landslide. According to the method, an ideal elastic-plastic solid model is adopted when the soil slope is in a small deformation state, so that the method can be suitable for stability analysis, and the model is automatically converted into a Bingham fluid model after the soil slope is unstable to generate a landslide,so that the method can be suitable for large deformation analysis of the landslide. The whole process analysis of the soil slope from stabilization to critical instability to instability sliding to final sedimentation is realized.

Description

technical field [0001] The invention relates to the field of computational mechanics, in particular to an analysis method for the whole process of soil slope and landslide based on the pseudo-spring solid-liquid conversion SPH method. Background technique [0002] In recent years, major accidents caused by landslides are not uncommon, such as the Shenzhen landslide in December 2015 and the Maoxian landslide in Aba Prefecture, Sichuan Province on June 24, 2017, which caused a large number of casualties and property losses. However, the current research on soil slope stability and landslide analysis often separates the mechanism research before the landslide disaster, that is, the slope stability research, and the movement process research after the landslide. However, the entire process from the stability of the soil slope to the end of the landslide, namely: stable state - critical stable state - instability - landslide movement - the whole process of forming the final accum...

AI Technical Summary

Problems solved by technology

However, the current SPH method still has deficiencies in the field of soil slope stability and landslide analysis research, and there are mainly two hot methods: one is to treat the soil slope as an elastic-plastic body, and this method is used before the slope landslide. However, since the high-speed movement after slope instability is a large deformation process, and the elastoplastic constitutive model based on the small deformation theory is used to calculate the process, its applicability needs further study. The other is to treat the soil slope as a non-Newtonian fluid, which is more suitable for the analysis of the landslide movement process after the slope is unstable, but because it uses a fluid model, it cannot analyze the Stability coefficient and potential slip surface, but need to artificially designate slip surface and landslide area

Therefore, although the two analysis methods have their own advantages, their application scope is also limited due to the characteristics of the constitutive model they choose, and it is difficult to truly express the slope from stable state to critical stable state to failure. Stabilization—landslide movement—the whole process to the formation of the final accumulation form

To sum up, since the current SPH method has limitations in the analysis of the whole process of soil slope landslide hazards, it is necessary to seek a suitable method that can accurately calculate the stability safety factor and potential slip surface of soil slopes. It is very necessary to be able to accurately predict the landslide movement process after the soil slope becomes unstable.

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