Performance-based slope earthquake vulnerability evaluation method

Abstract

The invention relates to a performance-based slope earthquake vulnerability evaluation method, which comprises the following steps of: firstly, selecting earthquake permanent displacement as an earthquake resistance evaluation index for deformation and damage characteristics of a slope under an earthquake load, and stipulating vulnerability states of the slope at different performance levels; quantitatively characterizing uncertainty of seismic oscillation and rock-soil body parameters in the slope dynamic random system by adopting a random seismic oscillation model and a random field theory respectively, and analyzing probability density evolution characteristics of slope seismic permanent displacement based on a probability density evolution theory; and calculating the conditional probability that the slope exceeds different same performance level requirements under the seismic loads with different intensities, and constructing seismic vulnerability evaluation curves of different vulnerability states of the slope. Compared with the prior art, the invention is high in calculation efficiency, can analyze the probability level of the slope in different performance states, and givesa more comprehensive, systematic and reliable vulnerability evaluation result.

Description

technical field [0001] The invention relates to the technical field of seismic geological disaster risk assessment, in particular to a performance-based seismic vulnerability assessment method for slopes. Background technique [0002] The seismic stability analysis of slope engineering is of great significance to the prevention and control of slope earthquake and geological disasters. In the field of slope engineering, the current seismic design and evaluation are mostly based on the quasi-static analysis method based on the limit equilibrium theory, and the influence of uncertain factors on the seismic performance of slopes is not considered. [0003] Seismic vulnerability analysis is one of the probabilistic analysis methods, which can characterize the influence of uncertainty on the seismic performance of the system, and give the conditional probability of the system exceeding different damage states under the action of earthquakes of different intensities, which is based...

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Problems solved by technology

However, there are two traditional seismic vulnerability analysis methods, one is to fit the empirical model based on post-earthquake survey data or test data, but it is generally difficult to obtain a large amount of post-seismic survey data; the second is based on incremental Dynamic analysis, cloud image method and Monte Carlo stochastic simulation are used to perform a large number of numerical calculations, combined with moment estimation or maximum likelihood estimation, to fit the seismic vulnerability analysis curve of the system by assuming a probability distribution form, which has The calculation efficiency is low, and the rationality of the hypothetical distribution form needs to be verified, etc.

Moreover, at present, in the field of seismic vulnerability analysis related to slopes, almost all of them focus on analyzing the vulnerability of engineering structures such as structures and roads under the influence of slope geological hazards, without considering the vulnerability of the slope itself under the action of earthquakes. destructive, so it is impossible to give a reasonable and objective evaluation result

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