混凝土破裂过程渗流-应力-损伤耦合模型

Coupling of seepage and stress and damage of concrete break

从基础理论方面研究混凝土材料渗流和应力的耦合作用机理,首先叙述了混凝土材料细观和宏观的联系,分析了混凝土的渗透特性以及耦合的基本概念。在经典Biot渗流力学基本方程的基础上,增加一个反映渗流系数和孔隙变化关系的耦合方程,并结合混凝土的弹性损伤本构方程,引入渗流突跳系数ξ这一概念,提出了复杂应力作用下混凝土损伤演化过程渗流-应力耦合方程。本模型通过渗流、应力和损伤的相互作用反映出材料的宏观复杂破坏现象和非线性行为。

For the purpose of studying the concrete material transfusion and the stress coupling action mechanism from the basic theory aspect, the paper expounds the microscopic and the macroscopic relation of the concrete materials and analyzes the concrete seepage characteristic as well as the coupling basic concept. Based on the basic equation of the Biot seepage mechanics, a coupling equation of seepage modulus and hole＇s transformation is added, the stress-strain equation of concrete is combined and a modulus ＂ξ＂ is introduced. This article puts forward a equation of coupling of seepage and stress of concrete damage under the process of complex stress.