完整岩石Hoek-Brown屈服准则参数m_i的经验模型  

An empirical model for determination of m_i in Hoek-Brown failure criterion for intact rocks

作　　者：彭俊[1,2] 荣冠[1,2] 王小江[1,2] 周创兵[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《中南大学学报（自然科学版）》2013年第11期4617-4623,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究计划('973'计划)项目(2011CB013501;2010CB732005);国家自然科学基金资助项目(50979081);新世纪优秀人才计划(NCET-11-0406);中央高校基本科研业务费专项资金资助项目(2012206020215)

摘　　要：建立参数mi与围压关系的负指数经验模型,并通过多种岩石三轴压缩试验数据拟合该模型的参数并验证模型的合理性。最后对该经验模型参数的取值规律及其影响因素进行了讨论。结果表明:负指数模型较常量mi模型能够更好地拟合三轴压缩试验数据;常量mi模型在高围压阶段拟合效果较好,但是在低围压及拉伸段拟合效果较差,而且常量mi模型往往高估岩石的单轴抗压强度及单轴抗拉强度。A negative exponent empirical model was proposed to express mi as a function of confinement and triaxial compression test data of various rocks are used to fit parameters of this model. Finally, parameter values in this empirical model and factors that influence these parameters were discussed. The results show that the new empirical model fits the test data better than the constant rni model for intact rocks. Constant mi model fits the test data well in the high confinement region but fails to match data well in the low confinement and tension regions. In particular, it overestimates the UCS and the uniaxial tensile strength of rocks.

关 键 词：Hoek-Brown屈服准则 三轴压缩试验 材料参数mi 围压 岩石强度 

分 类 号：TU452[建筑科学—岩土工程]