Constitutive Model Considering The Damage Characteristics Of Frozen Soil Structure

Frozen soil is a kind of special material,and the studies of frozen soil structural have also experienced a long and tortuous exploration,with the development of science and technology,the technology of artificial frozen soil has more application,the research on the structural of frozen soil is still important,both the establishment of the theory and the accumulation of experience,engineering construction will be more safety and science with the development of the research on the structural of frozen soil.This article analyze the mechanics properties of permafrost and study the structural of the permafrost through the test of reshape artificial frozen soil with the design of different moisture content and temperature single-axis compression and creep.Computer statistics of real-time data to correct the cross-sectional area,considering the influence of Poisson's ratio on the test data,providing more in line with the actual test data for the later research work.The starting conditions gate(gate value of stress and strain injury value)and the relationship between the temperature and moisture content come from the single-axis compression test;To determine the damage variable D,frozen damage constitutive model is obtained,under different test conditions for single-axis compression curve fitting,proved that this model can describe stress-strain curve characteristics of frozen clay very well.According to the single-axis creep test analysis freeze creep properties of cohesive soil and the application of different rheological model,thereby established considering the rheological model of structural damage,and compared the theoretical value and experimental value,proved that this model can describe the creep properties of frozen clay very well.Analysis creep of frozen soil under single-axis compressive strength and the effect of fitting and damage constitutive model,the results show that the damage constitutive model can describe the creep pressure after frozen soil stress-strain curve in the elastic stage and the strain is larger when the damage to the stage very well,but the early beginning injury with the experimental value has a bigger difference at the end of the elastic period.