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Date of Publication:2009-01-01

Journal:土木工程学报

Volume:42

Issue:3

Page Number:132-141

ISSN No.:1000-131X

Abstract:Effects of in-crack water pressure and distribution on the stress
   intensity factors (SIF) of concrete dams are investigated by using the
   scaled boundary finite element method (SBFEM), the advantage of which is
   that it gives analytical solutions of displacement and stress fields in
   the radial direction and thus facilitates its application to problems
   with singularities, such as in fracture mechanics. In addition, SBFEM
   can conveniently handle interracial cracks between the two different
   materials. Taking the heel crack of a concrete gravity dam as an
   example, the effects of water pressure distribution inside the crack,
   ratio of Young's modulus between the two materials as well as crack
   length on the SIF are studied. For the case of low water pressure or no
   pressure, the crack is predicted to be in the state of compression-shear
   if the modulus of the foundation rock is relatively low. The crack
   subjected to higher water pressure would be in a tension-shear state. It
   is also suggested that when the inner water pressure exists, K_Ⅰ and K_Ⅱ
   vary distinctly with the magnitude of water pressure and the ratio of
   Young's modulus.

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