基于Mohr准则的岩石损伤本构模型及其修正研究  

Study on the constitutive model and its modifying for rock damage based on Mohr criterion

作　　者：蒋维[1] 邓建[1] 司庆超[2] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]河北工程大学资源学院,河北邯郸056038

出　　处：《河北工程大学学报（自然科学版）》2010年第2期30-32,37,共4页Journal of Hebei University of Engineering:Natural Science Edition

摘　　要：基于Mohr准则,重新定义了岩石微元强度。考虑岩石微元强度服从随机分布的特点,结合损伤力学理论和统计强度理论,建立了三轴压缩条件下岩石损伤本构模型。为使建立的模型更具一般性,分析了模型参数与围压的关系,并据此对模型参数进行合理修正,从而建立出完整的岩石损伤本构模型。与试验结果比较,所建模型可以灵活地模拟各级围压下岩石破裂过程的全应力应变关系,尤其是应变软化特性。同时,该模型形式简单,应用方便,接近工程实际。Based on Mohr criterion, the rock micro- unit strength is redefined. Considering the characteristie that the strength of rock micro - unit is of stochastic distribution, using damage mechanics theory and the statistical strength theory, a damage constitutive model is established under rock triaxial compression test. To form a more general damage constitutive model, the relationship between model parameters and confining pressure is discussed and from which the model parameters are modified. Accordingly, a com- plete damage constitutive model is established. Contrast with triaxial compression test results, this model can well simulate the relation of stress - strain during the full process of rock failure under the various lev- els of confining pressure, especially the characteristic of strain softening. Besides, this model is simple and convenient to apply, capable of having properties approaching the actual situation of engineering projects.

关 键 词：岩石破裂 Mohr准则 微元强度 损伤 本构模型 

分 类 号：TU45[建筑科学—岩土工程]