Constitutive Model And Displacement Solution For The Whole Process Of Principal Stress-Strain

Scholars from various countries have never slackened the study of the stress-strain relationship of soil materials.There are hundreds of constitutive models established.The strength criteria corresponding to these models are: Moore Coulomb criterion,DP yield criterion,Mises yield criterion.,Tresca yielding criteria,etc.It is impossible to reflect the nature of the soil in the past hundreds of soil constitutive models.It is a practical method to study and apply the model to the characteristics of some aspects of the soil.In recent years,with the development and advancement of finite element disciplines,more and more scholars have combined constitutive models with various finite element software,such as ABAQUS software.ABAQUS software not only has many different unit types,material simulation and analysis processes,but also provides users with a convenient and flexible secondary development platform,including several user subroutines and utilities that can be called during programming.In order to further promote the development of soil constitutive model,the author analyzes the Cam-Clay model and the principal stress-strain constitutive model and its parameters,mainly doing the following work:(1)Analyze the existing soil constitutive models at home and abroad,summarize and analyze the advantages and disadvantages of various constitutive models,and provide some references for the research.(2)Introduce the Cam-Clay model(including the modified Cam-Clay model)and the new shear stress constitutive model proposed by Professor Lu Yingfa,and extend the new shear stress constitutive model to the principal stress-strain constitutive model,respectively The basic equations,parameter values and correlation coefficients of the two models are analyzed.(3)The Cam-Clay model and the principal stress-strain constitutive model were used to verify the conventional triaxial test data of a clay in Wuhan.Based on this test,the main stress-strain constitutive model was solved.By comparing the parameters,it is found that the modified Cam-Clay model and the principal stress-strain constitutive model have satisfactory results and are satisfactory.(4)Develop a subroutine of modified Cam-Clay model and principal stress-strain constitutive model,and embed it into ABAQUS finite element software,compare the result with the experimental results,and demonstrate the modified Cam-Clay again.Model and principal stress--the authenticity of the results of the strain constitutive model.The same experiment was calculated and analyzed by using the Cam-Clay model and the principal stress-strain constitutive model developed in this paper.The calculation results show that the calculation results of the two constitutive models are satisfactory,which further validates the applicability of the principal stress-strain constitutive model in the constitutive model of soil,and further develops the constitutive model of soil.Made a contribution.