DOUBLE-MEDIUM CONSTITUTIVE MODEL OF GEOLOGICAL MATERIAL IN UNIAXIAL TENSION AND COMPRESSION  

作　　者：刘晓丽 王思敬 王恩志 薛强 

机构地区：[1]Department of Hydraulic and Hydropower Engineering,Tsinghua University,Beijing 100084,P.R.China [2]Department of Hydraulic and Hydropower Engineering,Tsinghua University,Beijing 100084,P.R. China Institute of Geology and Geophysics of the Chinese Academy of Sciences,Beijing 100029,P.R.China [3]Institute of Rock and Soil Mechanics of the Chinese Academy of Sciences,Wuhan 430071,P.R.China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2006年第10期1361-1372,共12页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (No.50374041)the National Key Project of the Tenth Five-Year Plan of China (No.2001BA803B0404)

摘　　要：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 are the pore-fracture double-medium, and porous medium has no damage occurring, while fracture medium has damage occurring 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 separates 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.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 are the pore-fracture double-medium, and porous medium has no damage occurring, while fracture medium has damage occurring 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 separates 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.

关 键 词：rock and soil materials geological materials double-medium constitutive model DAMAGE 

分 类 号：TU43[建筑科学—岩土工程]