Dynamic Characteristics Of Frozen Cement Modified Aeolian Soil Study On Property And Constitutive Model

The aeolian soil is widely distributed in the western part of Liaoning.The area is often modified to make it an excellent roadbed filler.In this paper,cement-modified aeolian soil is used as the research object,and related indoor tests such as dynamic and static triaxial test,water stability test and mix ratio test are carried out.The simulation study is carried out by Midas GTS NX.The main research results are as follows:(1)The retrieved aeolian soil was screened and compacted under different cement contents,and the optimum moisture content of the cement modified aeolian soil was obtained.After preparing the standard test piece according to the optimal water content and different cement content,it was cured at room temperature for 7 days,and the unconfined compressive strength test was carried out to study its strength characteristics.The water stability test was carried out on the specimens with different cement contents at room temperature for 7 days,and the water stability was analyzed.(2)The dynamic triaxial loading test was carried out on the frozen cement modified aeolian soil specimens treated at room temperature for 7 days,and the damping ratio,dynamic elastic modulus and backbone curve were studied.The dynamic stress-dynamic strain model was applied to various dynamic stress-dynamic strain models.Applicability was analyzed and studied.(3)Through the use of continuum damage mechanics,thermodynamics and other related research results to analyze the test process,the temperature gradient of 0 is the frozen soil inequality.Then the function characteristics and basic boundary conditions of the evolution equation D of frozen cement modified aeolian soil are obtained by derivation.When the specimen is subjected to cyclic loading,the cumulative damage it produces is a nonlinear superposition process.The creep constitutive model and rheological constitutive model of the paper are obtained by introducing the damage variables,and the relevant experimental data are fitted.(4)After the finite element model is established,the maximum deformation of the subgrade under the CRTSIII type slab ballastless track is analyzed.Defining the train load,the response of the subgrade acceleration,velocity,stress and strain in all directions under the two-way relative train load is analyzed.Under the single-sided and double-sided train loads,the acceleration,velocity and stress along the X direction are applied.The strain response was compared and analyzed.The paper has 44 pictures,11 tables,and 67 references.