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《Journal of Lanzhou University of Technology》 2012-02
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Modified Duncan-Chang model of constitutive loess

TANG Yu-long,ZHOU Fei-fei(Lanzhou Railway Design Institute Co.,Ltd.,Lanzhou 73000,China)  
In order to realize the unification of investigation of structural feature of intact collapsible loess with that of constitutive model and solve the problem of positive definiteness of tangent stiffness matrix of softening stress-strain curves,the pattern of structural damage of intact structural loess caused by moistening consolidation and shearing deformation was investigated in the condition of different water content and consolidation pressure,and a modified Duncan-Chang constitutive model of collapse loess was established.In this nonlinear constitutive model,the damage of soil structure caused by moisture addition and load application was taken into consideration and the moisture content was taken as an important variable to calculate the tangent modulus of current strain state with a bunch of hyperbolas with identical initial tangent modulus and different ultimate strength.By so doing,the stress-strain curve of structural loess could be described in a unified way with the strain-induced hardening and softening,and a new method of deformation and strength calculation was formed for the case of intact collapsible loess with coupled moisture addition and stress changing.
【CateGory Index】: TU444
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