True Triaxial and Directional Shear Cell Experiments on Dry Sand

摘要

This report contains results from experiments on Leighton Buzzard sand performed in the multiaxial cubical apparatus (MCA)--or true triaxial apparatus--and the directional shear cell (DSC). These experiments provide a data bank for calibrating constitutive models or for fundamental investigations of soil under highly generalized stress paths. The MCA experiments were performed under four levels of mean stress (2, 5, 8 and 10 psi) with each individual test being performed at a constant mean stress level. Thus, each experiment provides data on response of sand to changes in stress paths within a particular deviatoric plane. The experiments include purely proportional deviatoric paths to assess initial anisotropy of the specimens. The remainder of the tests are designed to highlight yield behavior of soil as it is often described by kinematic hardening models. A total of 134 MCA experiments are reported. The DSC experiments were designed with the intent to determine the effect that rotating the principal stress axes had on yield behavior. As for the MCA experiments, yield characteristics can be investigated through nonproportional stress paths within a particular deviatoric plane. In contrast to the MCA tests, the principal axes were rotated freely in the DSC experiments. A total of 48 DSC experiments are reported. The intent of the report is to provide data necessary for research on constitutive relationships for soil. A brief account is also given on useful analysis techniques to aid in interpreting experimental results. Keywords: Soil deformation tests; Stress strain relations, Granular soils, British cohesionless soil. (edc)