Research On The Constitutive Relationship Of Frozen Clay Based On The Burgers Model

The success or failure of freezing construction largely depends on the reasonable design and safe construction of the freezing wall.Accurate understanding of the formation law and mechanical characteristics of the frozen wall is an important basis for the scientific and reasonable design of the frozen wall.Therefore,studying the mechanics and deformation characteristics of artificial frozen soil and revealing its mechanics and deformation laws is a basic work in the field of frozen soil physical mechanics.The compressive strength and creep characteristics of frozen soil are important contents of physical and mechanical research on frozen soil.The heterogeneity of frozen soil makes the physical and mechanical properties of frozen soil complex,and it is difficult to use simple mathematical models to characterize the entire process of frozen soil compression and creep.Among the many factors that affect the strength of frozen soil,temperature is the most direct influencing factor.Therefore,studying the influence of temperature on the compressive strength of frozen soil is of great significance to freezing construction.In this context,this paper mainly takes the typical deep clay in Huainan mining area as the research object,carries out the frozen uniaxial compressive strength test and the frozen uniaxial creep test,analyzes its mechanical properties and creep characteristics,and establishes the B Guss creep constitutive model,using genetic algorithm to invert the model parameters,and verify and analyze the model and the parameter inversion method based on other test results.The main research conclusions are as follows:(1)In the aspect of uniaxial compressive strength research : according the stress-strain relationship of the test to fitting the power function model and the exponential function model,found that the exponential function model has better description effect on frozen clay;According to the result of fitting the relationship between temperature and uniaxial compressive strength,elastic modulus and Poisson’s ratio,found that there is a linear relationship between temperature and uniaxial compressive strength,elastic modulus and Poisson’s ratio,which reflects that temperature is the most important Influencing factor of the frozen soil mechanical properties(2)In the aspect of uniaxial creep deformation research: using the idea of rheological model method,combined with the Burgers model,the constitutive relationship of frozen clay considering damage is established;with the help of the better robustness of genetic algorithm,based on the results of uniaxial creep test,the parameters of constitutive relationship are inversed,and according to the correlation coefficient,the constitutive relationship has a good description effect on the creep of frozen clay.(3)In order to better verify the correctness of the constitutive relationship,according to the creep test results of test report on physical and mechanical properties of conventional soil and frozen soil in Dongfeng well inspection hole of Liuzhuang Mine,the genetic algorithm is used to invert the model,and it is also concluded that it has good creep description effect.Therefore,it can be concluded that under the premise of considering the damage of frozen soil,the constitutive relationship derived by combining with Burgers model has a good description effect on frozen clay,which can provide reference for the safety design and construction of freezing method.Figure[92] table[11] reference[79]...