Analysis method for predicting crack propagation of dam body of concrete dam

Abstract

The invention provides an analysis method for predicting crack propagation of a dam body of a concrete dam. The method comprises the following steps of building a first finite element model of the dam body, wherein the dam body contains an existing crack; simulating crack end concrete of the dam body by adopting a damage model to obtain a fracture prediction path of the crack end concrete of the dam body; adjusting a grid of the first finite element model to form a second finite element model, simulating a preset crack by adopting a first contact model, and performing calculation to obtain a slip quantity and an opening degree of the preset crack, wherein the preset crack is a crack generated according to the fracture prediction path, and the first contact model relates to the tensile strength and the shear strength of the concrete. According to the method, the advantages of the damage model and the contact model are coupled; the finite element analysis method for predicting the crack propagation by two stages is proposed; the limitation of a numerical analysis method in the present stage is overcome; and the method can be applied to the prediction of the crack propagation of the dam body of the concrete dam.

Description

technical field [0001] The invention relates to an analysis method for predicting crack expansion of a concrete dam body, which belongs to the field of water conservancy and hydropower engineering simulation. Background technique [0002] During the long-term operation of a large number of high dam projects in my country, it has been found that cracks are the most important disease in the operation period of concrete dams. Especially high dams in western my country are subjected to huge water thrust, complex stress state, unstable geological environment, difficult construction, and harsh operating environment. Therefore, as the operating age of high dams increases, the dam body will face cracks of varying degrees risks of. Therefore, how to predict the expansion path of cracks in the dam body, so as to facilitate the maintenance of the dam body in advance, is an important technical problem in this field. [0003] At present, there are limitations to the prediction methods o...

AI Technical Summary

Problems solved by technology

In the simulation of concrete cracks based on the finite element method, although the separation crack model can simulate the expansion of open cracks, the boundary conditions of crack expansion must be re-meshed and updated at each step, which is a huge amount of calculation for complex crack simulation. of

In addition, the diffuse crack model and the damaged crack model are models based on continuum mechanics. Although they can simulate the crack propagation path, the crack is represented in the form of a finite element damage zone, and the diffuse crack model and the damaged crack model cannot consider the discontinuity of the crack. Therefore, it cannot intuitively represent the contact state such as crack opening and slipping

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