基于变形离散元法的重力坝地震开裂分析

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (7) : 49-55.

论文

基于变形离散元法的重力坝地震开裂分析

杨利福，常晓林，周伟，程勇刚，马刚

作者信息 +

Seismic cracking analysis of gravity dam based on deformable distinct element method

YANG Lifu, CHANG Xiaolin, ZHOU Wei, CHENG Yonggang,MA Gang

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文章历史 +

摘要

考虑脆性材料Ⅰ型和Ⅱ型复合断裂情况，基于渐进破坏理论建立了混凝土损伤破坏模型，提出一种损伤开裂模型与变形离散单元法耦合的分析方法。模拟了Koyna坝在强烈地震作用下的渐进破坏过程，通过与室内模型试验及其他方法所得结果的对比，验证了该方法的可靠性和正确性。研究表明：坝体初始裂缝是由地震拉应力集中所致，坝体开裂后，裂缝周围应力重新分布，但缝端仍存在拉应力集中现象，导致裂缝不断扩张；裂缝发展可分4个阶段；裂缝贯通后，坝头与底部剧烈错动，坝体动能减小，摩擦功急剧增加。

Abstract

Considering the condition of mode-I and the mode-II mixed fracture, a concrete damage failure model was established based on the fracture process zone theory. A coupling method of the model and deformable distinct element method was proposed .The progressive failure process of Koyna dam were studied. The reliability and rationality of the proposed method was verified by comparing results of model test and other methods. The results indicate that the initial crack is resulted in tensile stress concentration induced by earthquake. Crack formation causes the redistribution of stress but there are still tension stress concentration phenomenon around the crack tip which resulting in crack expanding. And the crack growth can be divided four phases. After fracture penetration severe dislocation happens between the head and bottom of dam, the kinetic energy decreases but the friction work dramatically increases.

导出引用

杨利福，常晓林，周伟，程勇刚，马刚. 基于变形离散元法的重力坝地震开裂分析[J]. 振动与冲击, 2016, 35(7): 49-55

YANG Lifu, CHANG Xiaolin, ZHOU Wei, CHENG Yonggang,MA Gang. Seismic cracking analysis of gravity dam based on deformable distinct element method[J]. Journal of Vibration and Shock, 2016, 35(7): 49-55

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