冻融循环条件下受荷岩石的损伤本构模型

Damage Constitutive Model of Loaded Rock Under Freeze-thaw Condition

基于岩石细观结构的非均匀性,建立了冻融受荷岩石损伤扩展本构关系,通过冻融损伤、受荷损伤与总损伤3个损伤因子描述岩石材料各层次的劣化程度及损伤演化途径。通过与岩石冻融循环力学特性试验结果对比,证明所建立的模型能够很好地反映不同冻融循环次数下岩石应力应变的变化关系。

Based on the heterogeneity of rock at microstructure,the damage propagation constitutive relation of freeze-thaw and loaded rock was established,the rock deterioration degree and damage evolution route for each level were described using three damage variables,freeze-thaw damage variable,loaded damage variable and total damage variable.Comparison with the result of freeze-thaw cycling and mechanical characteristics experiment of rock shows that the established model can reflect well the variation relationship between stress and strain of rock under different free-thaw cycles.