单轴作用下岩土材料的双重介质本构模型

基于弹塑性力学和损伤力学理论，将岩土材料视为孔隙-裂隙双重介质，假设孔隙介质不发生损伤，而裂隙介质随应变的增加发生损伤，建立了单轴作用下岩土类材料的双重介质本构模型隐式表达式，并利用Newton迭代法得出了材料的全程应力-应变曲线．分析结果表明，岩土材料中裂隙空间展布的多态性（均匀展布、集中展布和随机展布）是岩土材料本构关系千变万化的根本原因．由于双重介质本构模型将岩土材料的弹性主体（孔隙介质部分）和损伤主体（裂隙介质部分）分化开来，对于研究岩土或含损伤材料的破坏具有实用价值和理论意义．

Double-Medium Constitutive Model of Geological Material in Uniaxial Tension and Compression

Based on elasto-plasticity and damage mechanics,a double-medium constitutive model of geological material under uniaxial tension and compression was presented,on the assumption that rock and soil materials being pore-fracture double-medium,and porous medium occurring no damage,while fracture medium occurring damage with load.To the implicit equation of the model,iterative method was adopted to obtain the complete stress-strain curve of the material.The result shows that many different distributions(uniform distribution,concentrated distribution and random distribution) of fractures in rock and soil material are the essential reasons of the daedal constitutive relations.By the reason that the double-medium constitutive model separating the material to be porous medium part,which is the main body of elasticity,and fracture medium part,which is the main body of damage,it is of important practical values and theoretical meanings to the study on failure of rock and soil or materials containing damage.