Numerical simulation and limit equilibrium calculation-based landslide hazard assessment method

Abstract

The invention relates to a numerical simulation and limit equilibrium calculation-based landslide hazard assessment method. The assessment method comprises the steps of building a corresponding numerical model by adopting a large deformation numerical simulation method in combination with field survey data and related modeling methods, and determining landslide body form contour lines and key position coordinates of different positions in a landslide path; based on a ring shear or direct shear test, determining residual shear strength of a landslide body-slope surface boundary plane; analyzingand calculating landslide body factors-of-safety of different positions and landslide body forms in the landslide path by utilizing a limit equilibrium method, namely, performing FOS calculation; determining FOS specifications of specification requirements, wherein indexes needed to be considered for determination of the specific FOS include a sliding distance, a landslide speed, the number of people in a hazard range, and a land resource type of a hazard-bearing body; and establishing a landslide hazard degree calculation formula and determining landslide hazard level judgment standards. Themethod is suitable for hazard assessment of all types of soil landslides, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of landslide prevention and control engineering, in particular to a landslide risk assessment method based on numerical simulation and limit equilibrium calculation. Background technique [0002] Landslide refers to the overall sliding of slope rock and soil along the weak structural surface in the slope under the action of gravity, which is a type of slope failure mainly caused by shear failure. It often occurs in mountainous, hilly and canyon areas, especially in areas with strong hydrodynamic and strong external load disturbances, the probability of slope damage is extremely high, which not only damages the environment and resources, but also causes heavy casualties and huge direct damages. or indirect economic loss. According to statistics, there were 13,120 landslide incidents in my country in 2013 alone, causing economic losses as high as 10.4 billion yuan. It can be seen that frequent landslide disas...

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Problems solved by technology

[0003] my country's landslide risk assessment began in the 1980s, and made great progress after the 1990s. The existing landslide risk assessment methods mainly include mathematical statistics, multi-index evaluation and scoring methods, fuzzy comprehensive evaluation theory, etc., but these Most of the methods have strong human subjectivity, which affects the accuracy and objectivity of the evaluation results

For example, "A Method for Quickly Identifying Landslide Risk Degree" with application number 201610122048.9, "A Method for Landslide Risk Evaluation Based on Extension Optimal Combination Weighting Method" with application number 201710355241.1, and "A Method for Landslide Risk Evaluation Based on Extension Optimal Combination Weighting Method" with application number 201310627906.1 Regional Landslide Disaster Risk Estimation Method", etc., the above-mentioned method has many evaluation indicators, is highly subjective and the calculation formula is cumbersome. In particular, the above-mentioned patents are aimed at when the landslide will stop sliding during the movement and the possible sliding distance and risk assessment. not involved

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