Experimental Study On Failure Criterion And Constitutive Relations Of Modification Soil Material

Soil as an important building materials for adobe building,there is contact of soil andwall,and the difference of two interdependent concepts.In order to describe the same type ofadobe wall macro structure and soil,microstructure,structure and morphology on the internalregulations of the material,for soil shear strength are studied.Aimed at the study of cohesivesoil this is used in the production of adobe block and masonry of adobe masonry buildingmaterials for experimental study of shear strength of cohesive soil,in mixed with wheat straw(plant fiber) and fine sand,formation of modified soil materials. As a result of adobeconstruction of modified soil material in almost completely dry state bears load,this paperpresents a close to the wall structure of the stem state soil material properties of cohesive soiland water,the mixing,molding,drying after the shear strength test. Using the conventionaltriaxial compression tests of the Xinjiang Earth Building Materials Determination of cohesivesoil shear strength,drying method for triaxial axis compression test,direct shear test,uniaxialcompressive test,the test results of an evaluation of the Xinjiang earth building clayey soilmaterial shear,compressive property. In order to better describe the test results and theoreticalanalysis,simulation of triaxial axial compression test results,the establishment of ANSYSfinite element numerical model,reach the test results and numerical modeling is consistentwith the level.In order to study the viscous constitutive relationship of soil,according tothe" standard for soil test method" on the physical properties of soil water physical properties,mechanical properties,experimental research,summarized the relationship between. Theclayey soil materials for basic soil mechanics physics test,to determine the clay physics andphysical index of water (moisture content,density, liquid limit, plastic limit index),afterthe mechanical properties of soil test,determination of(σ₁-σ₃)-ε₁curve (the principalstress difference-axial strain curve),through the main stress intensity envelope,that clay soilshear strength index c and,Solve the question about shear strength of cohesive soilvariability occurs in "soil test method standard"triaxial tests,proposes a combination of clay sample method, accurate determination of the value of shear strength of cohesive soil.finallysummarizes,propose cohesive soil and modification of soil by the corresponding failurecriterion and constitutive relation of. The Duncan-Chang model,the conventional triaxialtest principal stress differenceσ₁-σ₃-ε₁and longitudinal strain1curve and thehorizontal direction and vertical direction strainε₁-ε₃relation curve to obtain the cohesivesoil basic elastic parameters E_t and ν_t. In the elastic parameters in the calculation formula ofdetermination of K,N, R,f, c,ψ,F,D and G,8parameter,to provide reference forXinjiang soil materials. this parameter by using triaxial test can determine. The clayey soilmaterial triaxial test cylinder specimen of ANSYS finite element nonlinear analysis. Finally,to build model using ANSYS finite element analysis software,simulation triaxial test ofclayey soil material,The result show that the results obtained by the numerical simulation innonlinear finite element analysis with coincide the "bulge" phenomenon from triaxial test.Analyzes its individual differences and reasons,to describe the reliability of numericalanalysis.This research to provide reference standard for the Xinjiang earth building materials.