Purpose

The consolidation behavior of prefabricated vertical drain (PVD)-installed soft deposits mainly depends on the PVD performance. The purpose of this study is to propose a numerical solution for the consolidation of PVD-installed soft soil using the large-strain theory, in which the reduction of discharge capacity of PVD according to depth and time is simultaneously considered.

Design/methodology/approach

The proposed solution also takes into account the general constitute relationship of soft soil. Subsequently, the proposed solution is applied to analyze and compare with the monitoring data of two cases, one is the experimental test and another is the test embankment in Saga airport.

Findings

The results show that the reduction of PVD discharge capacity according to depth and time increased the duration required to achieve a certain degree of consolidation. The consolidation rate is more sensitive to the reduction of PVD discharge capacity according to time than that according to the depth. The effects of the reduction of PVD discharge capacity according to depth are more evident when PVD discharge capacity decreases. The predicted results using the proposed numerical solution were validated well with the monitoring data for both cases in verification.

Research limitations/implications

In this study, the variation of PVD discharge capacity is only considered in one-dimensional consolidation. However, it is challenging to implement a general expression for discharge capacity variation according to time in the two-dimensional numerical solution (two-dimensional plane strain model). This is the motivation for further study.

Practical implications

A geotechnical engineer could use the proposed numerical solution to predict the consolidation behavior of the drainage-improved soft deposit considering the PVD discharge capacity variation.

Originality/value

The large-strain consolidation of PVD-installed soft deposits could be predicted well by using the proposed numerical solution considering the PVD discharge capacity variations according to depth and time.

中文翻译：

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考虑放电容量随深度和时间变化的PVD软土大应变固结分析

目的

预制垂直排水管 (PVD) 安装的软沉积物的固结行为主要取决于 PVD ​​性能。本研究的目的是使用大应变理论为安装 PVD ​​的软土固结提出数值解，其中同时考虑 PVD ​​放电容量随深度和时间的减少。

设计/方法/方法

所提出的解决方案还考虑了软土的一般构成关系。随后，应用所提出的解决方案对两种情况的监测数据进行了分析和比较，一种是实验测试，另一种是佐贺机场的测试堤防。

发现

结果表明，PVD 放电容量根据深度和时间的减少增加了实现一定程度固结所需的持续时间。固结率对PVD放电容量随时间的降低比随深度的降低更为敏感。当 PVD ​​放电容量降低时，PVD 放电容量随深度降低的影响更为明显。使用所提出的数值解的预测结果在两种情况下的监测数据都得到了很好的验证。

研究限制/影响

在本研究中，仅在一维固结中考虑 PVD ​​放电容量的变化。然而，在二维数值解（二维平面应变模型）中实现放电容量随时间变化的一般表达式具有挑战性。这是进一步学习的动力。

实际影响

考虑到 PVD ​​放电容量变化，岩土工程师可以使用建议的数值解决方案来预测排水改善的软沉积物的固结行为。

原创性/价值

考虑到 PVD ​​放电容量随深度和时间的变化，使用所提出的数值解可以很好地预测安装 PVD ​​的软沉积物的大应变固结。