Study on constitutive model of root soil complex based on mixture rule
In order to explore the stress-strain relationship of a root soil complex,it is considered as a two-phase body.A linear elastic model is used for the root system,and the Duncan-Chang model is used for the soil.Considering the relative slip relationship between the root system and the soil,the constitutive model of the root soil complex is established based on the mixture rule.Through the triaxial compression test of plain soil and root soil complex with different root contents,the stress-strain relationship is obtained.The elastic modulus of the root is obtained through the single root tensile test.The results show that(1)the ultimate principal stress difference of the root soil composite increases first and then decreases with the increase of root content,and the optimal root content was 0.3％.(2)The diameter of a single root conforms to the power function relationship with the tensile strength,and to the polynomial relationship with the elastic modulus.(3)Through the inverse analysis method,the slip relationship is established.The stress-strain relationship of the calculated value of the model is obtained.It is found that the fitting accuracy(R2)of the calculated value of the model and the test value is 0.96.This study provides a new idea for the establishment of the constitutive model of root soil composite,and provides parameters for the numerical analysis of a root soil complex.
root soil complexconstitutive modelDuncan Chang modellinear elastic model
万方数据
维普
