The Characteristics for the Unsaturated Tri-axial Tests of Suction, Yield and Strength Intact Loess Based on True

الملخص EN

Under the condition of measuring suction, there are few reports on the experimental study of unsaturated intact loess with true triaxial apparatus.

In order to study the effect of intermediate principal stress and suction on the mechanical properties of unsaturated intact loess, a series of isotropic consolidation and shear tests with different intermediate principal stress ratio b under constant water content were performed on intact loess with various initial suctions with the true tri-axial apparatus for unsaturated soil.

The characteristics of suction, yield, and strength of unsaturated intact loess were studied.

The results show that when the moisture content is relatively smaller, the suction decreases rapidly after isotropic consolidation, the suction decreases slowly while the water content is comparatively large, and the suction increases with the rise of b value after shear.

The yield suctions of unsaturated soils with different initial suction are identical, and the isotropic compressive yield stress increases with the increase of initial suction.

The growth of net mean stress has a great influence on the bulk deformation of unsaturated soil before yield point, and the suction plays a major role in the bulk deformation of unsaturated soil after yield point.

The shear strength of unsaturated soil is enhanced with the increase of suction.

The amplitude of increase at low suction is greater than that at high suction.

With the decrease of initial suction, the suction differences at shear failure become smaller and smaller under different net confining pressures.