A Judgment Method of Rainfall Threshold for Landslide Disaster Monitoring and Early Warning

Abstract

The invention discloses a method for judging a rainfall threshold for landslide disaster monitoring and early warning, and relates to a method for rainfall-induced landslide critical value. Taking the correlation between model tests and rainfall-triggered landslide damage and deformation as the research direction of the early warning critical value, a damage geological model is established for typical landslide types in earthquake-stricken areas, and multiple indoor (outdoor) model tests are used to analyze the structure caused by rainfall landslide seepage and stress field changes. Correlation of destruction, to obtain the critical reference value of rainfall and landslide early warning. And through the real-time monitoring and inspection of the field landslide debris flow remote monitoring and early warning system established by the project team, the critical value of rainfall early warning is finally provided. The invention makes up for the deficiencies in the research on the deformation, damage and formation mechanism of rainfall landslides (debris flow source bodies) after earthquakes, forms a basic subject theory for the study of geological disaster monitoring and early warning critical values, and provides scientific basis for geological disaster monitoring and early warning decision-making.

Description

technical field [0001] The invention relates to a method for rainfall-induced landslide critical value, in particular to a method for judging the rainfall threshold for landslide disaster monitoring and early warning. Background technique [0002] After the Wenchuan Earthquake in 2008, under rainfall conditions, these loose accumulations induced tens of millions of resurrection-type collapses and landslides, and provided rich source conditions for debris flows, which contributed to the post-disaster reconstruction of the earthquake-stricken areas and the safety of people's lives and property. pose a great threat. At present, under the premise that the country cannot provide enough funds for engineering treatment of every landslide in the earthquake-stricken area, monitoring and early warning has become an important measure to reduce casualties and property losses. The remote real-time monitoring and early warning system for rainfall-type landslides is a modern support techn...

AI Technical Summary

Problems solved by technology

For example: ① The method of determining the critical value of rainfall by counting the amount of rainfall and the number of landslides is more suitable for early warning of rainfall and landslide trends in regional space, but not suitable for early warning of typical landslides (debris flow source bodies)

Moreover, this method relies heavily on the reliability of the source of statistical data, and the rainfall data in general areas are difficult to meet

② The method of determining the critical value of rainfall for early warning of the landslide failure mechanism is mostly based on the hydrological model of slope seepage, while ignoring the accelerated failure process of the structure caused by the change of the stress state during the seepage process of the slope, so it cannot be truly Reflect the impact of rainfall on landslides in the actual process

Most rainfall and landslide early warnings only focus on the possible damage results of landslides, but rarely analyze the macroscopic deformation of the ground surface in the early stage of real landslides, the time-series development of deformation and the correlation with the development of landslide deformation, so as to accurately judge whether landslides occur under rainfall conditions unstable

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