混凝土破裂过程细观损伤与渗流耦合模拟  

Coupled simulation of meso-damage and seepage during the process of concrete failure

作　　者：赵吉坤[1] 张子明[1] 祁顺彬[2] 

机构地区：[1]河海大学土木工程学院,江苏南京210098 [2]南京交通职业技术学院,江苏南京211188

出　　处：《河海大学学报（自然科学版）》2008年第1期71-75,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(50379004)

摘　　要：假定混凝土是由骨料、砂浆、界面和随机微缺陷组成的四相复合材料,并据此假定建立了混凝土四相复合材料的细观力学模型,导出了混凝土弹塑性损伤-渗流耦合本构方程,同时数值模拟了试样破裂过程,基于细观尺度研究了混凝土弹塑性损伤-渗流耦合问题.结果表明:混凝土渗透系数的变化与混凝土试样弹塑性损伤破裂全过程密切相关;破坏的细观单元成为渗流的主要通道.Under the assumption that concrete was a four-phase composite material consisting of mortar, aggregate, interface and random micro-flaw at the meso-level, a meso-mechanical model for four-phase composite materials was developed. A coupled elastoplastic damage-seepage constitutive equation for concrete was deduced, and the failure process of concrete samples was simulated. The study of elastoplastic dmnage-seepage coupling of concrete in mesoscopic view shows that the variation of permeability coefficient of concrete is closely related to the process of elastoplastic damage, and the damaged meso-element is the main passage of seepage.

关 键 词：混凝土 渗流 弹塑性损伤 随机微缺陷 

分 类 号：TV431[水利工程—水工结构工程]