Consolidation by Prefabricated Vertical Drains with a Threshold Gradient

Consolidation by Prefabricated Vertical Drains with a Threshold Gradient
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具有阈值梯度的预制垂直排水沟固结

DOI:
10.1155/2014/410390
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发表时间:
2014-12
影响因子:
--
通讯作者:
邓岳保
邓岳保
中科院分区:
工程技术4区
文献类型:
--
作者:
郭宵;谢康和;邓岳保

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本文给出了具有门槛坡度的预制竖井径向固结的近似解析解。为了了解门槛坡度对固结的影响,采用本方法进行了参数分析。在两个算例中验证了本方法的适用性,并与Hansbo的结果和观测数据进行了比较。结果表明:(1)具有阈值梯度的流动不会在整个单胞内瞬间发生。相反,它是从垂直排水沟向外逐渐发生的;(2)移动边界永远不会达到影响外半径,但会在某一时刻达到影响外半径;(3)超孔压不会完全消散,但在固结结束时会保持一个长期稳定值;(4)阈值梯度越大,长期超孔压越大;(5)与以往方法相比,本方法能更好地预测软土中的固结性状。
This paper shows the development of an approximate analytical solution of radial consolidation by prefabricated vertical drains with a threshold gradient. To understand the effect of the threshold gradient on consolidation, a parametric analysis was performed using the present solution. The applicability of the present solution was demonstrated in two cases, wherein the comparisons with Hansbo’s results and observed data were conducted. It was found that (1) the flow with the threshold gradient would not occur instantaneously throughout the whole unit cell. Rather, it gradually occurs from the vertical drain to the outside; (2) the moving boundary would never reach the outer radius of influence if , whereas it will reach the outer radius of influence at some time; (3) the excess pore pressure will not be dissipated completely, but it will maintain a long-term stable value at the end of consolidation; (4) the larger the threshold gradient is, the greater the long-term excess pore pressure will be; and (5) the present solution could predict the consolidation behavior in soft clay better than previous methods.
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