Test Analysis On The Elastic-Plastic Constitutive Model Of Saturated Remodeling Loess

With the advancement of western development,the geotechnical engineering construction develop rapidly.The loess are widely distributed in the western area,understanding and reflecting the mechanical characteristics and engineering properties will have important values of theoretical guidance and practical application for engineering construction in loess areas.In this thesis, combined with the saturated remodeling loess in Dingxi Area,a series of compression tests,consolidation tests, triaxialtests for remodeling saturated loess had been performed , which the deformation characteristics and the intension characteristics had been determined. Secondly the Duncan-Chang constitutive model had been discussed and all the model parameters had been determined. Thirdly,obtained the parameters of the modified cam-clay model and compared with the test curves.Then by using professor Liu that metioned in the new method of the cap model, obtained various consolidation pressure of model parameters and compared with three loading functions.Based on the tests,some useful conclusions had been got after the research.The test results show that stress-strain deformation behaviors as little hardening, and shearing contraction characteristics,the curve have obvious linear segment,then obtained the strenth parameters.Combining with the method of Duncan-Chang parameters,by using the engineering drawing software 0rigin7.5, the stress-strain relationship model for saturated remodeling loess have been suggested. By comparing the results under various confining pressures (strain is less than 15%)and theoretical model,both of them anastomosed well.By solving several typical cap model and combining with test curves of saturated loess, the modified cam-clay model of the shearing strain value calculation is less than test value.It is showed out that WeiRu-long and Sandier model anastomosis the tests well. According to the elastic-plastic theory and the yield function had been proposed which was adapted to condition,one constitutive model of loess is set up.Based on the tests of the saturated remodeling loess ,it is a helpful attempt for revealing the behavior of saturated loess,it has important reference value for the elastic-plastic constitutive model theoretical research of saturated remodeling loess.