摘要
以寒区岩体工程为背景,针对冻融受荷岩石,从细观力学机理出发,运用宏观唯象损伤力学和非平衡统计的概念和方法,得到了以冻融循环次数和应变为损伤演化控制变量的损伤演化方程;应用推广后的应变等价原理,建立了较为真实的岩石冻融受荷损伤扩展本构关系;探讨了岩石材料细观结构损伤及其诱发的材料力学性能演化途径。研究表明:岩石的冻融损伤是一个疲劳损伤破坏过程;冻融与荷载的双重作用对岩石损伤的影响表现出明显的非线性特征,其耦合效应使总损伤有所弱化;岩石的岩性、初始损伤状态确定冻融循环和应变对损伤扩展的影响特性。
The paper derives the damage evolution equation in terms of freeze-thaw cycle and strain for the freeze-thaw and loaded rock based on micro mechanical mechanism and using the methods of macro phenomenological damage mechanics and non-equilibrium statistics.The real damage propagation constitutive relation of the freeze-thaw and loaded rock is established by using the generalized theory of strain equality.And the evolutionary route of micro-structural damage and materials mechanical properties for the rock are discussed.It is shown that the damage of freeze-thaw rock is mainly caused by fatigue.The dual effect of the freeze-thaw and the load on the rock damage presents obvious nonlinear property,and the coupling effect weakens the whole damage.Moreover,the influence of freeze-thaw cycle and strain on the damage propagation is determined by the lithology and the initial damage state of the rock..
出处
《工程力学》
EI
CSCD
北大核心
2011年第5期161-165,共5页
Engineering Mechanics
基金
国家自然科学基金项目(40872177
50974102)
陕西省自然科学基金项目(SJ08A21)
陕西省教育厅专项基金项目(11JK0525)
关键词
岩石
冻融受荷
耦合
损伤模型
力学特性
rock
freeze-thaw and load
coupling
damage model
mechanical characteristics
