Earthquake dynamic reliability analysis method for slope supporting structure

Abstract

The invention relates to an earthquake dynamic reliability analysis method for a slope support structure. The method comprises the following steps of generating a series of random earthquake dynamic acceleration time history based on a random earthquake dynamic model; establishing a finite element dynamic analysis model, and calculating to obtain a series of support structure seismic displacementtime history; establishing and solving a generalized probability density evolution equation of the slope supporting structure to obtain a numerical solution of a displacement probability density function of the supporting structure at each moment; and obtaining an earthquake dynamic reliability result according to the numerical solution of the support structure displacement probability density function at each moment. Compared with the prior art, a series of seismic oscillation acceleration time history is generated on the basis of the random seismic oscillation model to represent randomness of seismic oscillation, solving is carried out on the basis of finite element dynamic analysis, and seismic horizontal displacement of the slope supporting structure is adopted as an evaluation index of the anti-seismic property of the supporting structure; intensity and frequency non-stationary characteristics of an earthquake, an amplification effect of seismic oscillation and dynamic nonlinearity of rock-soil body parameters are considered.

Description

technical field [0001] The invention relates to the technical field of seismic dynamic stability analysis, in particular to a seismic dynamic reliability analysis method for slope support structures. Background technique [0002] Most of the traditional and existing seismic performance evaluation and design methods of slope retaining structures are based on deterministic theory. The impact of these factors on the seismic performance of supporting structures cannot be considered by conventional deterministic analysis and design methods. In recent years, reliability theory has provided new ideas for quantitatively characterizing uncertainty and its influence on the stability of slopes and supporting structures. However, most of the existing geotechnical reliability analyzes are concentrated in the field of static analysis. [0003] Studies have pointed out that in the seismic performance evaluation of geotechnical structures, the main source of uncertainty is the randomness ...

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Problems solved by technology

However, because its principle is based on random sampling of large samples, its efficiency is low, and there is a problem of random convergence. For dynamic time-history analysis problems, the amount of calculation is even greater.

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