双面排水条件下未打穿竖井地基固结计算

通过在竖向排水井底面以下土层中设置虚拟砂井, 得到了双面排水条件下考虑土层三维渗流从而更符合实际情况的解析解.根据所得解编制了计算程序, 分析了在双面排水情况下未打穿竖向排水井地基的固结性状, 并与单面排水情况进行了比较, 比较显示双面排水使未打穿砂井地基固结速率大为提高.同时, 以此解为基准, 对现有未打穿竖向排水井地基平均固结度近似计算公式和方法进行了较为详细的比较, 得出了现有近似计算公式及方法适用的范围.

Computation for consolidation of soft soil with partially penetrated vertical drain under double-drainage condition

Corresponding analytical solution was obtained through assuming a virtual drain beneath the tip of the actual one.This solution considered the three-dimensional seepage existed during the consolidation of soil beneath the vertical drain and was therefore approaching better to the actual situation.A relevant computer program was developed,and consolidation behavior of soft soil with partially penetrated vertical drains under double-drainage condition was investigated and compared with consolidation behavior under single-drainage condition.Consolidation velocity of soft soil with partially penetrated vertical drains under double-drainage condition was increased sharply.On the basis of this solution,the approximate methods so far available for computing average consolidation degree of soft soil with partially penetrated vertical drains were compared in detail,and their applicable conditions were obtained.