Biaxial compression creep test on green-schist considering the effects of water content and anisotropy

This study explores the effects of water content and anisotropy on the mechanical behavior of green-schist. The biaxial compression creep tests under dry and saturated conditions were first carried out. Then, the influences of geometric relationship between the loading orientation and the bedding plane, water content and volumetric content of marble interlayer were analyzed. The results indicate that both instantaneous and creep strains along two loading directions decrease with the increasing volumetric content of the marble interlayer. The influence of water content on the axial and the lateral instantaneous strains is different when the volumetric content of chlorite is different. For specimens of the same type at the same stress level, the axial strain with the both loading orientations parallel to the bedding plane is greater than that with the axial loading parallel to the bedding plane but the lateral loading perpendicular to the bedding plane.