Stiffness and Deformation Characteristics of a Cemented Gravely SAND

The deformation and stiffness characteristics of a cemented gravely sand was investigated usingtriaxial equipment. the triaxial tests were conducted in both dry and saturated undrained conditions.artificially cemented samples are prepared using gypsum plaster as the cementing agent. the plaster wasmixed with the base soil at the weight percentages of 1.5, 3,4.5 and 6. the applied confining pressure variedbetween 25 to 500 kpa in triaxial tests. the process of yielding of the soil was investigated for the consideredsoil and the bond and final yield points were identified for the cemented soil with different cement contents.the variations ofdeformation and stiffness parameters with cement content and confining stress were studiedas well. some of the parameters were determinedfor both drained and undrained conditions to investigate theeffect of drainage condition on the stiffness and yield characteristics of the tested cemented gravely sand.according to the results, the difference between drained and undrained tangent stiffness decreases withincrease in confining stress. finally the effect of cement type was investigated as an important parameteraffecting the stiffness at bond yield. the rate ofincrease in tangent stiffness at bond yield changes with cementcontent for different cementing agents.