Research On Rheological Test And Model Of Remolded Saturated Cohesive Soil

The loading rate is introduced into the analysis and model study on the rheological properties of the soil,which has great theoretical value and practical significance for the security and stability of the correct forecast of building settlement and control of geotechnical engineering.In this paper,the saturated cohesive soil were taken for research object,with the combination of experiment and theory,the K0 consolidation test and graded continuous loading test of remolded saturated cohesive soil were carried out in order.Based on the rheological behavior and regularity of soil in different loading rates with external loading,the rate dependent empirical model and rheological constitutive model are established,and the relationship of the two models is also discussed.The main research work of this paper include:1?The K0 consolidation test and the continuous loading test of saturated remolded cohesive soil were carried out,it is mainly focused on the rheological properties of saturated cohesive soil by controlling the change of loading rate.At the same time,based on the experimental data,the deformation mechanism of remolded saturated clayey soil is explored.The results show that the stress strain relationship is different due to the different test stages,and this is also the basis of stage modeling in later chapters.2?To investigate the characteristics of remolded saturated cohesive soil.Always test control stress changes linearly with time,and analyzed the timeliness of soil pore pressure and strain as well as the nonlinear characteristics and viscosity of soil.At the same time,the influence of rate were studied,results showed that: The change of loading rate only affects the process of soil deformation,however,in the case of soil is not damaged,it has little effect on the final strain.3?According to the different stages of the experiment,the rate dependent empirical constitutive model is established.Based on the experimental data,taking the influence of loading rate into account,an empirical constitutive model with strain and loading rate is grading established,and the test data are also complementary to demonstrate the model.Then the paper discuss the physical meaning of the model parameters.4?According to the rheological characteristics of remolded cohesive soil under saturatedcondition,based on the semi-theoretical and semi-empirical correction principle.The Kelvin model,the modified Maxwell model and the nonlinear empirical formula are used to describe the linear viscoelastic strain,linear viscoplastic strain and nonlinear viscoplastic strain,respectively.A semi-empirical rheological model of nonlinear semi-element for saturated remolded clay was constructed.At the same time,the relationship between the parameters of the model and the rate dependent empirical model parameters is studied.