混凝土重力坝结构损伤机理及演化规律研究

Study on the mechanism and evolution law of structural damage in concrete gravity dams

混凝土重力坝作为水利工程的主要坝型,其结构损伤机理及演化规律研究对确保大坝安全性和稳定性具有重要意义。针对混凝土重力坝在承载作用下可能面临的温度应力损伤、收缩徐变损伤和疲劳损伤等问题,采用理论分析、实验研究和数值模拟等方法,对混凝土重力坝结构损伤机理进行了深入研究。基于损伤力学理论,明确了损伤状态变量,提出了各项异性弹性受损材料的本构模型,分析了混凝土材料的微观损伤机理和性能特点,揭示了混凝土重力坝在不同损伤阶段下的应力应变变化规律。

The research on the mechanism and evolution law of structural damage in the concrete gravi-ty dam,as the main dam type in water conservancy engineering,is of great significance to ensure the dam safety and stability.Aiming at the problems such as temperature stress damage,shrinkage and creep damage and fatigue damage that the concrete gravity dam may face under load,the structural dam-age mechanism of the concrete gravity dam is deeply studied by theoretical analysis,experimental re-search and numerical simulation.Based on the damage mechanics theory,the damage state variables are defined,the constitutive model of anisotropic elastic damaged materials is put forward,the micro-dam-age mechanism and performance characteristics of concrete materials are analyzed,and the stress-strain changing rules of the concrete gravity dam at different damage stages are revealed.