Newmark correction model earthquake landslide risk assessment method

Abstract

The invention relates to an earthquake disaster risk assessment method, and discloses a Newmark correction model earthquake landslide risk assessment method, which comprises the following steps of (1) collecting geological topography information, earthquake information and geological environment information; (2) obtaining the critical acceleration acN of the rock mass according to the geological topography information, and judging the influence weight of geological factors in the information obtained in the step (1) on the landslide by utilizing an analytic hierarchy process model; (3) correcting the critical acceleration acN of the rock mass according to the influence weight of each geological factor on the landslide, and recording the corrected critical acceleration as acM; and (4) combining the seismic oscillation peak acceleration PGA and the corrected critical acceleration acM in the geological and topographic information, and utilizing a Newmark displacement model to solve the cumulative displacement of the rock mass so as to evaluate the risk of seismic landslide according to the cumulative displacement of the rock mass. According to the Newmark correction model earthquake landslide risk assessment method, the earthquake landslide risk can be rapidly and accurately assessed.

Description

technical field [0001] The invention relates to an earthquake disaster risk assessment method, in particular to a Newmark revised model earthquake landslide risk assessment method. Background technique [0002] Earthquake landslide is a major secondary disaster accompanied by earthquake, which has the characteristics of suddenness, mass and wide range, and its harm is second only to the earthquake itself. [0003] Therefore, carrying out the risk assessment of earthquake landslides and determining the prone and dangerous areas of earthquake landslides is an effective way to reduce earthquake landslide disasters, which can provide reference for post-earthquake emergency rescue and land use planning. [0004] The methods for assessing the risk of earthquake landslides in the prior art are mainly the statistical analysis method and the Newmark displacement analysis method based on the mechanical model. Among them, the reliability of the statistical analysis method depends on t...

AI Technical Summary

Problems solved by technology

Among them, the reliability of the statistical analysis method depends on the accuracy and completeness of the landslide catalogue. However, it is difficult to obtain a complete landslide catalogue within a short period of time after the earthquake with the current technical level, so the reliability of the statistical analysis method for the assessment of the landslide risk after the earthquake is reduced; The Newmark model is mainly based on the analysis of rock mass mechanical parameters, and it is extremely difficult to obtain accurate regional rock mass mechanical parameters. Even for the same type of rock group, the rock mass structure, weathering degree and hydraulic properties are not the same. Therefore, Although the seismic landslide risk obtained by the Newmark displacement analysis method has a strong correlation with the ground motion parameters and terrain slope, the Newmark displacement analysis method in the prior art still cannot Satisfy the accuracy requirements of earthquake landslide risk assessment

Images