| Loess is a kind of quaternary sediments,mainly distributed in northwest in our country,give priority to with tan,have larger pores,is rich in carbonates,vertical joints growth.Because special structural loess,the loess collapsibility deformation under the influence of water,causing the deformation intensity and soil water characteristics,great changes have taken place seriously affect the engineering construction.As countries of the western region development efforts to increase gradually,many important infrastructure construction in the loess foundation,so the study of the loess characteristics gradually paid great attention by people.In this paper,based on the former research of unsaturated loess,the research of unsaturated loess humidification deformation intensity and soil water characteristics.(1)On the undisturbed loess under different suction drainage shear test,study the effect of suction on the loess shear deformation and strength.(2)based on the shear strength of natural undisturbed loess,Under the different straight shear stress level,The classification humidifying shear test of undisturbed loess.Analysis the undisturbed loess deformation intensity and soil water characteristics under the function of shear stress and vertical stress and water.Gives the relation between initial shear shear stress and wet shear failure shear stress and vertical stress.(3)Drainage and moisture content of lateral confined compression test for undisturbed loess Under the condition of controlling suction,Analysis of different drainage conditions on the undisturbed loess compression deformation and the influence of soil water characteristics,Using the VG model fitting moisture content under the condition of lateral confined compression of soil water characteristic curve.(4)Hierarchical humidifying experiment under confining compression stress condition.Studied the classification under the net vertical stress in humidification.Humidification deformation characteristics and the influence of soil water characteristics under net vertical stress.Contrast analysis of the single line method and double method of LC yield line. |
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