蜗壳外围混凝土裂缝扩展的数值模拟  

Numerical Analysis for Complete Crack Propagation in Concrete of the Spiral Case Structure

作　　者：李正星[1] 马震岳[1] 

机构地区：[1]大连理工大学水利工程学院,辽宁大连116024

出　　处：《黑龙江大学工程学报》2010年第3期12-17,共6页Journal of Engineering of Heilongjiang University

基　　金：辽宁省教育厅重点实验室科研项目资助项目(2008S045)

摘　　要：根据混凝土断裂力学理论,在蜗壳外围混凝土内部设置初始裂缝,应用虚拟裂缝模型建立平面轴对称有限元模型,编程计算了直埋式蜗壳外围混凝土裂缝的扩展过程。计算结果表明:断裂力学理论中的虚拟裂缝模型可以很好地模拟蜗壳内部裂缝的整个断裂扩展过程,得到单一裂缝的内水压力-裂缝口张口位移(裂缝口宽度)曲线;通过引入断裂角的概念,得到蜗壳裂缝扩展的准确路径,直埋式蜗壳子午断面内裂缝扩展的主要方向为通过蜗壳中心的径向。On the basis of the theory of fracture mechanics,setting a initial crack in the concrete of the spiral case,building a plane axisymmetric model by fictitious crack model theory,a complete crack propagation in concrete of the direct embedded spiral case were calculated by program.The results show that the fictitious crack model theory of fracture mechanics is well suitable to simulate the whole progress of crack propagation in spiral case,and getting the internal water pressure versus crack mouth opening displacement（the width of crack mouth） curve of a single crack.Utilizing the concept of break angle,getting the accurate path of the spiral case crack propagation,the main orientation of the crack propagation on the meridional plane of the embedded spiral case is the radial direction which is through the centre of the spiral case.

关 键 词：裂缝扩展 直埋式蜗壳 断裂力学 虚拟裂缝模型 数值分析 

分 类 号：TV313[水利工程—水工结构工程]