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Date:2022-08-29

Indexed by:Journal Article

Date of Publication:2022-06-28

Journal:人民长江

Institution:建设工程学部

Issue:19

Page Number:60-62,84

ISSN:1001-4179

Abstract:For investigating the instability law of upper part of a gravity dam under seismic load, the time-history nonlinear fi-nite element method is adopted to analyze the stress fields in gravity dams under seismic loads, and then a global optimization method to search the critical slip surface in gravity dams is proposed by simulated annealing algorithm. The presented algorithm could search the critical slip surface in the stress field of all the increment steps, compute anti-slide safety coefficient of the dam upper part and the corresponding occurrence moment are also obtained. An important conclusion is that the gravity dam tends to slide upstream under seismic loads. For a specific earthquake wave, the profile of the sliding surface and the corresponding oc-currence moment are very close even if the amplitude of the seismic waves is not the same.

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