Concrete gravity dam operation period crack propagation discrimination method

A technology of crack propagation and discrimination method, which is applied in the field of crack propagation discrimination during the operation period of concrete gravity dams, and can solve the problems of not accurately considering the quasi-brittle material properties of concrete

Active Publication Date: 2020-07-28
山西省河道与水库技术中心
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Problems solved by technology

The existing crack analysis methods regard concrete as a linear elastic model, and do not accurately consider the properties of concrete as a pseudo-brittle material

Method used

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  • Concrete gravity dam operation period crack propagation discrimination method
  • Concrete gravity dam operation period crack propagation discrimination method
  • Concrete gravity dam operation period crack propagation discrimination method

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Embodiment Construction

[0093] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0094] Such as figure 2 The two-dimensional planar cracking body Ω shown and the boundary Γ=Γ u +Γ t +Γ c , where Γ u , Γ t and Γ c They are the displacement boundary, stress boundary and fracture surface respectively, without considering the body force, and the boundary conditions are described as follows:

[0095]

[0096] σ·n=λτ 0 ,onΓ t (2)

[0097]

[0098] σ + n + = σ - n - =τ c ,onΓ coh (4)

[0099] In the formula is the gradient operator, σ is the Cauchy stress tensor, u is the displacement, n is the outward unit normal vector on the boundary Γ, is the prescribed displacement, τ 0 is the standard traction force, λ is the load factor, and n + =-n - =n c ...

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Abstract

The invention discloses a concrete gravity dam operation period crack propagation discrimination method. The method comprises the steps: determining geometric and mechanical parameters and adverse working conditions of a dam; establishing an integral three-dimensional finite element model, and obtaining a dam stress field and a deformation field under various adverse working conditions; determining a sub-region where the crack is located according to the position and size of the dam crack; determining boundary conditions of the corresponding subareas for each adverse load; re-optimizing the grid division and node arrangement of the crack subareas; establishing a nonlinear discrete control equation by adopting an extended finite element method; solving a nonlinear discrete control equation;and judging whether the crack is expanded or not, if the crack is expanded, adding nodes to the expanded crack, continuing to calculate until the crack under the working condition is not expanded, and similarly, carrying out the next working condition until all adverse working conditions are completely simulated. According to the method, the deep fusion of the variable node expansion finite element and the cohesion model is realized, the properties of the concrete quasi-brittle material are fully considered, and the crack expansion judgment is accurate and efficient.

Description

technical field [0001] The invention belongs to the technical field of concrete gravity dams, and in particular relates to a method for discriminating crack expansion during the operation period of concrete gravity dams. Background technique [0002] There are a large number of concrete gravity dams in my country, many of which have deep cracks. The existence of cracks seriously affects the integrity and safety of the dam, especially the deep cracks along the upstream and downstream directions. The existing crack analysis methods regard concrete as a linear elastic model, and do not accurately consider the properties of concrete as a pseudo-brittle material. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for discriminating the crack propagation of concrete gravity dams during operation, which realizes the deep integration of extended finite element, variable node element and coh...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23
Inventor 芦绮玲方卫华付宏何淇王雪那巍杜建明杨俊杰
Owner 山西省河道与水库技术中心
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