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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。
Based on the rock mass engineering in the cold area, aiming at the rock mass subjected to freezing and thawing, the concepts and methods of macro-phenomenological damage mechanics and non-equilibrium statistics are used to study the mechanism of microscopic mechanics. The damage evolution equations of the control variables are established. After the generalized strain equivalence principle is applied, a more realistic rock-freezing damage-expansion constitutive relationship is established. The damage of the rock mesostructures and the evolvement of the mechanical properties of the materials are discussed. The results show that the freeze-thaw damage of rock is a process of fatigue damage and destruction. The dual effect of freeze-thaw and load has obvious non-linearity on the rock damage, and its coupling effect weakens the total damage. The lithology, The initial damage state to determine the characteristics of freeze-thaw cycles and strain on the damage expansion.