Stress-Dilatancy Relationship of Erksak Sand under Drained Triaxial Compression

Analyzing the results of triaxial compression tests under drained conditions for Erksak sand published in the literature, the stress-dilatancy relationships were described using the frictional state concept. At all phases of shearing, the linear stress ratio-plastic dilatancy relationship can be expressed by the critical frictional state angle and two parameters of the frictional state concept. At failure, dense sand exhibits purely frictional behavior (alpha = 0, beta = 1) and the stress ratio-dilatancy relationship may be correctly described by the Rowe, Bolton, and frictional state concept relationships. Very loose Erksak sand sheared under drained triaxial compression at the ultimate state reaches a stable condition, but the reached stress ratio is significantly smaller than the one at a critical state.