ANTSOTROPTC SHEAR CHARACTERISTICS OF UNDTSTTTRRFD PFAT

Abstract

Both vertical and horizontal samples of undisturbed fibrous peats, which were obtained by maintaining the axes of thin-walled tubes parallel to the vertical and horizontal directions in the peat ground, were used. These samples contained the amount of organic matters more than 70%. A series of the undrained triaxial compression and extension tests with pore water pressure measurement were performed on the specimens which were normally consolidated and overconsolidated under an isotropic stress condition, and the influence of fabric anisotropy on undrained shear behavior of peats was investigated. Test results indicated that as the anisotropic fabric of fibrous peat which had formed during accumulation still remained after the end of isotropic consolidation, anisotropic shear behavior was observed remarkably.