BEHAVIOR OF A CEMENTED CLAY

A series of 18 triaxial CIUP (undrained isotropically consolidated wit h pore pressure measurement) tests of fissured cemented Neogene lacust rine clay from northern Bohemia is analyzed, with special reference to the shear strength. The effects of sample disturbance, swelling, and cementation are shown to be the principal factors affecting the shear envelope. During the prepeak stage of testing, destruction of the ceme ntation of some specimens occurs, which is reflected in the wavy form of the stress-strain diagrams. The linear strength envelopes were foun d to be arranged according to the amount of disturbance (as expressed in the magnitude of swelling). Cemented and uncemented specimens diffe r when pore-water pressure and stress-strain diagrams are compared.