The Study, Based On The Gds Undisturbed Loess Traits Test

Much has been done on the study of the shear strength and deformation characters of loess. On the basis of the analysis of literatures about loess, triaxial shear tests and K-zero consolidation tests are carried out on unsaturated and undisturbed loess(Q3) which comes from Longxi area in Gansu province. All tests are done in GDS triaxial testing system.In triaxial shear tests, pore air pressure and pore water pressure are measured separately and matric suction is calculated. This paper tries to make use of unsaturated soil mechanics to study the shear strength characters of undisturbed loess. Stress-strain relationship, the relationship between volumetric strain and water content ,the relationship between shear strength and water content are analyzed in this paper.In K-zero consolidation tests, lateral pressure is increased linearly. When it is up to the scheduled value, lateral pressure is kept unchanged. The variation of axial stress, deformation and coefficient of lateral pressure is expounded in this paper.