饱和砂土的物态变化特性

Physical state change of saturated sand

通过饱和砂土的往返加卸载三轴试验 ,揭示了饱和砂土的初剪缩、剪胀、次剪缩、反向剪缩等物态变化特性 ,论证了它们与不排水条件下饱和砂土孔压的变化和排水条件下剪缩剪胀体应变的变化具有内在的联系 ,从而验证了往返加卸载复杂应力条件下饱和砂土不同物态的客观存在性 ,为进一步揭示动荷条件下饱和砂土的复杂变形特性提供了研究基础。

Based on the cyclic triaxial tests of saturated sand in drained and undrained conditions the physical states change including the preliminary negative dilatancy,positive dilatancy, secondary and reversal negative dilatancy and so on were explored completely by the response of pore water pressure under undrained cyclic loading and the volumetrical strain induced by shear under drained cyclic loading . It has been verified that the physical states exist factually so as to provide the basis for studying the deformation properties in complicated stress conditions.