Aeolian Sand Test with True Triaxial Stress Path Achieved by Pseudo-Triaxial Apparatus

Aeolian sand is a special roadbed filler, but its three-dimensional mechanical properties are rarely studied. To obtain the characteristic of deformation, strength on deviatoric plane, and failure in three dimensions, series triaxial drained tests aeolian Tengger Desert, under condition constant average principal stress, p, were conducted by an equivalent alternative method to achieve true stress path pseudo-triaxial apparatus. The results show that can better determine strength. peak shear decreases gradually with increase intermediate coefficient, b, at same p. Compared SMP Mohr–Coulomb criteria, near lines predicted both criteria. At lower specimen exhibited strain-softening behaviours, higher it showed hardening behaviours. Under conditions p contraction first then dilatancy. deformation greatly affected anisotropy, as p-value increases, effect initial anisotropy begins weaken. εs (generalized strain)/η (stress ratio)-εs curves, be expressed linear equation, which slope b-value. experiment verifies feasibility rationality method. test data provide support for maintenance desert roadbeds sustainable development economy society ecologically fragile areas.