考虑孔压消散时黏土的动变形研究

针对饱和黏土随时间的增加不断排水的情况,在不排水动剪切之后,实施了孔压消散阶段,并对不同消散程度土体的不排水剪切变形进行了研究.结果表明：完全固结后,饱和黏土刚度与动强度将会提高,再次保持原动应力水平不排水剪切时,土体轴向塑性变形基本不发生变化;当孔压消散与不排水动力剪切重复作用时,土体的变形主要来自于固结排水产生的轴向形变,且动剪切产生的动孔压与固结时的排水量随固结次数的增加而减小,并最终趋于稳定.随着固结度的增加,不排水剪切时的动变形不断减小.

Clay Dynamic Deformation with the Consideration of Dissipation of Pore Pressure

During the research of dynamic response of saturated clay, undrained triaxial tests are usually conducted. Based on the fact that the saturated clay will ceaselessly drain overtime, tests were carded out to investigate the undrained shear behavior of saturated clay after the dissipation of excess pore pressure. The results show that stiffness and dynamic strength will increase after consolidation, and the axial plastic deformation changes little under the for- mer dynamic loading level. When the dissipation of pore pressure and undrained shear are repeated, the axial deforma- tion mainly comes from consolidation, and the excess pore pressure and drainage volume will decrease with the in- crease of consolidation times, then come to a steady value. The undrained shear deformation will descrease with the increase of consolidation degree.