Abstract
Sand and clay are typical elastoplastic materials. The behavior of sand and clay under various three-dimensional stress conditions has been analyzed by the elastoplastic models based on the tij-concept proposed before. These models can consider the influence of intermediate principal stress on the deformation and strength by using the modified stress tij. However, the elastic behavior of sand and clay has not been paid much attention.
In the present study, elastic constitutive equations for sand and clay are proposed by introducing the tij-concept into Hooke's law. The validity of the proposed equation is confirmed by analyzing various triaxial compression and extension tests on Toyoura sand under drained conditions. The elastic behavior under undrained condition is also discussed. It is indicated that the proposed equation with the tij can predict well the elastic behavior of sand in general stress systems.
