【摘要】 结合含裂隙类岩石材料模型试验观测结果,从含裂隙类岩石材料破坏过程和破坏机制出发,将表征体单元(RVE)划分为弹性区及剪切局部化带两个部分,并把剪切局部化带内的变形过程抽象为胶结强度弱化及摩擦强度增强两个阶段。重点考虑了这两个阶段一前一后发挥作用这一由试验所揭示的结构性破坏本质,同时借助于试样的滑移变形定义与胶结强度弱化相关的破损变量,抓住试样渐进性破坏的特征,进而采用细观链式模型及均匀化方法将破坏过程的细观特征与宏观力学特性相结合,建立含裂隙类岩石材料局部化渐进破损模型的理论公式。最后对已建立的含裂隙类岩石材料局部化渐进破损模型进行试验验证,模型计算结果与M.Yumlu和M.U.Ozbay的试验结果吻合很好,证明所提出模型的正确性。更多还原

【Abstract】 The constitutive model of rock mass remains one of the most fundamental theoretical problems in rock mechanics to be solved.Based on the experimental results of the fractured rocklike materials,the localized progressive damage model is built.In this model,the representative volume element(RVE) is divided into the elastic zone and localized shear band according to the failure process and failure mechanisms of the fractured rocklike materials.The deformation process of the localized shear band is divided into cohesion weakening and friction strengthening phases.So,the emphasis in establishing the model is placed on the failure essence of the fractured rocklike materials,that is to say,the phases of cohesion weakening and friction strengthening should be exerted in tandem,which is discovered by the experiment.Moreover,in this model the processes of cohesion weakening and friction strengthening are represented by the damage variable which is defined in virtue of the relative sliding displacement of the shear band that represents the characteristics of the progressive failure process of the RVE.Furthermore,the chain model in localized band and homogenization method are adopted to combine the meso characteristics with the macro mechanical properties in this localized progressive damage model.Finally,based on the experimental results of M.Yumlu and M.U.Ozbay,the localized progressive damage model is validated.The result calculated through the localized progressive damage model agrees well with the experimental result,which proves the model is right.更多还原