节理岩体本构模型数值模拟及其验证  

NUMERICAL SIMULATION OF JOINTED ROCK MASS CONSTITUTIVE MODEL AND ITS VALIDATION

作　　者：张敏思[1] 王述红[1] 杨勇[1] 

机构地区：[1]东北大学资源与土木工程学院,沈阳110004

出　　处：《工程力学》2011年第5期26-30,共5页Engineering Mechanics

基　　金：国家高技术研究发展计划(863计划)项目(2007AA06Z108);国家973基础研究计划项目(2007CB209405);辽宁省自然科学基金项目(20092011);中央高校基本科研业务专项资金项目(N090401008;N090101001);教育部留学回国科学研究基金项目(20071108-3);国家自然科学基金项目(10872046);高等学校博士点科研基金项目(200801450003)

摘　　要：为了深入研究节理裂隙岩体的破坏机理,基于Mohr-Coulomb准则,利用(PFC)离散元程序,引入颗粒接触连接本构关系,建立了含孔洞岩样Burgers蠕变模型,以数值模拟的应力-应变曲线与试验曲线吻合作为PFC细观力学参数选取的准则,并利用获得的力学参数对含孔洞节理岩体破坏过程进行数值再现,模拟了不同颗粒单元参数试样的宏观变形、损伤、破坏过程,同时验证了所建立的岩样Burgers模型在岩体损伤破坏领域应用的可行性。算例部分利用所建立模型对含孔洞节理岩体在加载条件下的破坏机制进行了讨论,该破坏机制可以用于实际工程的破坏模式预测和岩体工程的稳定性评价。To analyze the failure mechanism of the jointed and fractured rock mass,the Burgers creep model of rock with holes has been built by discrete element program（Particle Flow Code）.In which Mohr-Coulomb Failure Criterion and Particle contact constitutive relationship are employed.The unification of stress-strain curves obtained by numerical simulations and test results has been used to select micro-level mechanical parameters of PFC,and these selected mechanical parameters are used to model numerically the failure process of the jointed rock mass with holes.Macro-level deformation,damage and failure process of rock samples with different particle unit parameters are achieved.At the same time,the feasibility of the Burgers Model for rock samples in the damage field of rock mass is verified.Finally,using the developed model,the failure mechanism of the jointed rock mass with holes under loading conditions is discussed.The failure mechanism can be reasonably applied to the prediction of failure modes in actual engineering practices and the stability evaluation of the rock mass engineering.

关 键 词：离散元 本构关系 Burgers蠕变模型 数值模拟 破坏机制 

分 类 号：TU452[建筑科学—岩土工程] O346.5[建筑科学—土工工程]