基于SMP准则的冻融受荷岩石损伤软化模型  

Damage Softening Model of Freeze-thaw Loaded Rock Based on SMP Criterion

作　　者：史磊 侯克鹏[1,2] 孙华芬 SHI Lei;HOU Ke-peng;SUN Hua-fen(School of Land and Resources Engineering,Kunming University of Since and Technology,Kunming 650093,China;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]云南省中-德蓝色矿山与特殊地下空间开发利用重点实验室,昆明650093

出　　处：《科学技术与工程》2023年第4期1658-1664,共7页Science Technology and Engineering

基　　金：云南省科技厅面上项目(KKS0202121020)。

摘　　要：运用损伤理论研究岩石的本构关系一直是岩石力学的热点问题。为进一步深入研究岩石的本构关系,根据现有损伤理论,基于SMP破坏准则,采用双参数Weibull统计损伤分布描述岩石微元体的破坏,定量分析了冻融受荷岩石损伤软化规律,构建了冻融受荷岩石统计损伤软化模型,并运用峰值点的偏导数方法确定其参数,最后引用前人相关力学试验数据对模型的合理性进行验证。结果表明:所建的预测模型曲线可以表征岩石的损伤变形,验证了冻融受荷岩石损伤软化过程的一般规律;运用SMP准则可以对冻融-荷载作用下岩石变形特性进行刻画,为冻融荷载作用下岩石变形破坏机制提供了思路。Using damage theory to study the constitutive relationship of rock has always been a hot issue in rock mechanics.In order to further study the constitutive relationship of rock,based on the existing damage theory and spatial mobilized plane(SMP)failure criterion,the damage distribution of rock micro-element was described by two-parameter Weibull statistical damage distribution,and the damage softening law of frozen-thawed rock was quantitatively analyzed.Statistical rock damage intenerated model of frozen-thawed loaded rock was constructed,and the partial derivative method of peak point was used to determine its parameters.Finally,the legitimacy of the model was verified by referring to the previous relevant dynamic test data.The results show that the established prediction model curve can characterize the damage deformation of rock,which verifies the general law of damage softening process of rock under freeze-thaw loading.The SMP criterion can be used to characterize the deformation characteristics of rock under freeze-thaw load,which provides an idea for the deformation and failure mechanism of rock under freeze-thaw load.

关 键 词：SMP准则 冻融循环 Weibull统计损伤分布 本构关系 

分 类 号：TU452[建筑科学—岩土工程]