排水固结地基在变荷载作用下的固结度简化分析

Simplified Analysis on Degree of Consolidation of Drainge Ground under Time-dependent Loading

在瞬时加载条件下砂井地基径向固结的偏微分方程的基础上,通过编制程序,简化分析塑料板排水地基受真空及堆载的变荷载作用下的固结。工程算例分析表明,考虑加载历时的影响,地基的平均固结速度在总体上要小于瞬时加载情况下的地基固结速度;单级或分级加载情况下的地基固结度受加载时间Ti的影响,加载时间Ti越长,地基固结速度越慢。简化计算结果与考虑竖向渗流时的结果对比表明,简化方法与精确解法结果较为接近,可以满足工程精度。

The simplified analysis on consolidaion of plastic drain board foundation under vaccum and timedependent loading conditions was made by the program compiled on the basis of the partial differential equations of radial consolidation of PVD＇ groud under instantaneous loading condition. It is shown by project calculation that the average consolidation rate of ground is generally slower than that under instantaneous loading condition owing to the effect of loading time. The consolidation degree of ground is influenced by the loading time T, under the single ramp loading or multi-ramp loading conditions. The longer loading time Ti is,the slower consolidation rate of ground is. It is found from the contrast that the results given by both simplified solution and solution considering vertical seepage are quite close,so the latter＇s can satisfy the engineering precision.