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Date of Publication:2016-01-01

Journal:水利学报

Affiliation of Author(s):建设工程学部

Issue:2

Page Number:219-228

ISSN No.:0559-9350

Abstract:Instability of foundation over multiple sliding planes is a general case occurring in bedrock un?der most engineering geological conditions of concrete gravity dams. But there are little literatures on exten?sively researching about this case. For simplication the instability probability was commonly evaluated using models of single or dual sliding plane(s) for the dam foundation. Base on the geometric interpretation of the realiability index, the reliability calculation can be treated as mathematical optimization, so the particle swarm optimization (PSO) can be used logically. A reliability calculating method on the basis of PSO is provided in the paper, which is applied to evaluate the stabiliy reliability index of concrete gravity dam foundation over multiple sliding planes. By camparison with the calculated results by other methods for three testing examples and an actural dam, the method is verified to be accurate, efficient and rational, and can be utilized to the practical complex engineering, for which the performance function for reliablity analysis is nonlinear and implicit. So the method will benefit the further research and provide good techni?cal support on the stabiliy safety assessment and structrual design of gravity dam.

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