附加应力沿深度变化的砂井地基固结分析

基于等应变固结的假设,考虑附加应力沿地基深度的变化以及涂抹效应和井阻的影响,导出砂井地基固结偏微分方程,求得孔隙水压力和平均固结度的解析解.在随时间变化的预压荷载作用下,对把初始孔隙水压力和附加应力简化为沿深度梯形分布的固结性状进行比较.结果表明,对于深厚砂井地基,附加应力和初始孔隙水压力分布对固结过程具有明显影响,若按均匀分布计算,所得的平均固结度偏小.

Analysis of sand drain ground consolidation considering additional stress distribution

Based on the equal strain consolidation model of vertical drains, the partial differential equations of the consolidation by sand drain ground were obtained, in which the influences such as the additional stress non-uniform distribution along depth with time-dependent preloading,and the well resistance and the smear action are taken into consideration. The analytical solutions about the excess pore water pressure and the average degree of consolidation are resulted. The consolidation process considering simply trapezoid distribution of additional stress and the initial pore water pressure along depth is analyzed with time-dependent preloading. It shows that the distribution of the additional stress and the initial pore water pressure have obvious influence on the consolidation process of the deep and drain ground, the average degree of consolidation deereases considering uniform distribution.