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考虑到土体处于超固结状态下的压缩性一般要比正常固结状态下的低,引入描述非Darcy渗流的Hansbo方程,修正了Terzaghi饱和黏土一维固结方程,并将其推广到低频循环荷载作用的情况。采用有限体积法对该方程进行了求解,并讨论了非Darcy渗流参数、循环荷载周期以及超固结状态下土体压缩性对固结进程的影响。计算结果表明,在矩形波载作用下,按孔压定义和按变形定义的固结度都随时间增长而震荡增加,且按孔压定义的固结度的震荡幅度明显大于按变形定义的固结度。另外,非Darcy渗流减缓了地基的沉降速率,且循环荷载周期越短,或超固结状态下压缩性越高,地基的沉降速率就越慢。
Considering that the compressibility of soil under overconsolidation is generally lower than that under normal consolidation, a Hansbo equation describing non-Darcy seepage is introduced to modify the one-dimensional consolidation equation of Terzaghi saturated clay and extend it to low frequency Circulation load situation. The finite volume method was used to solve the equation. The influence of non-Darcy seepage parameters, cyclic loading cycles and soil compressibility on the consolidation process under overconsolidated condition were discussed. The calculation results show that under the action of rectangular wave load, the consolidation degree defined by pore pressure and deformation according to deformation increases with time and the oscillation increases, and the amplitude of consolidation degree defined by pore pressure is obviously larger than that defined by deformation Results. In addition, non-Darcy seepage slowed down the settlement rate of the foundation, and the shorter the cyclic loading period or the higher compressibility in the overconsolidated state, the slower the settlement rate of the foundation.