異方性粘土の二・三の力学特性について

Abstract

To investigate the influence of anisotropy of the clay on the undrained shear stren-gth, consolidated undrained triaxial shear tests were performed on two kinds of cylindri-cal samples trimmed vertically and horizontally from the artificially sedimented kaolin clay.The sedimented kaolin clay was made by the following procedure: kaolin clay wasmixed with 0. OlN NasSiO8 solution and sedimented from a dilute suspesion whose claycontent was about 10 weight %. Orientation of clay particles was measured by usingX-ray diffraction and it was found that particles in the sedimented clay orientatedparallel to the horizontal bedding plane.For normally consolidated samples, the undrained shear strength of vertically cutsamples was almost equal to that of horizontally cut ones, and for overconsolidatedsamples, the former was greater than the latter.It is concluded that anisotropy with respect to undrained strength of anisotropic clayis mainly attributed to the character of tendency of volume change due to shear.