混凝土破裂过程细观损伤与渗流耦合模拟

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.

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

Under the assumption that concrete was a four-phase composite material consisting of mortar,aggregate,interface and random micro-flaw at the mesolevel,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 damage-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.