中文摘要：

在现行本构模型研究的基础上,建立了一种全新本构模型,它可以描述4种行为特征：弹性-弹塑性-软化、弹性-弹塑性-硬化、理想弹塑性、弹脆性;其模型参数只有4个,现行模型只是该模型的特例（如：邓肯-张模型）,介绍了模型参数的决定方法,其决定的依据是：模型所描述的行为特征与实测数据之间相关度最优;分析了岩土体破坏后区特征,提出岩土体破坏后区行为可以定义为视应力-视应变特征。并以实例对该模型进行了说明,结果表明,该模型可以描述岩土体的行为特征,并对虚内键模型、弹簧模型和离散单元法等具有借鉴作用。

英文摘要：

Based on the current research on constitutive model of rock-soil mass,a new constitutive model is developed.It can describe the four different behavior characteristics of rock and soil,including elastic-plastic softening,elastic-plastic hardening,perfect elasto-plastic,elastic fragile.There are four parameters of new constitutive model.The existing constitutive models such as Duncan-Chang model are only a special case of the proposed constitutive model.Its parameter calibration is performed.The basis of constitutive model parameters calibration is that the correlation coefficient between the behavior characteristics described by the new constitutive model and experiment data is located in the optimal state.The behavior characteristics of post failure of rock-soil mass are analyzed,it is found that the behaviours of post failure of rock-soil mass can be described with quasi stress-strain relation.The experiments are used to verify the applicability of the developed model.The results show that the model is suitable to describe the behavior characteristics of rock-soil mass and can provide a reference for research on virtual internal bond model,spring model and discrete element method,etc.