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Date of Publication:2009-01-01

Journal:水利学报

Affiliation of Author(s):建设工程学部

Volume:40

Issue:9

Page Number:1096-1102

ISSN No.:0559-9350

Abstract:Based on the scaled boundary finite element method(SBFEM) the variation
   of the dynamic stress intensity factors(SIF) at the heel of gravity dams
   subjected to earthquake excitation is analyzed.The SBFEM has the
   advantage that the displacement field along the radial direction can be
   solved analytically and the SIF is determined directly from its
   definition so that no special crack tip treatment is needed.The Koyna
   gravity dam is analyzed as an numerical example for demonstration.The
   time domain and frequency domain analysis are carried out.The SIFs for
   different length of cracks at dam heel are evaluated and the variations
   of stress along the dam foundation interface are calculated.In
   addition,the effect of the water pressure distribution inside the crack
   is also studied. The results show that the maximum value of K_Ⅰ varies
   distinctly with the increase of crack length.Furthermore,the SIF tends
   to increase with higher internal water pressure of crack.The proposed
   analysis method is useful for aseismic safety evaluation of gravity dam.

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