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An analytical solution for consolidation of PVD-installed deposit considering nonlinear distribution of hydraulic conductivity and compressibility

机译：考虑水力传导率和可压缩性的非线性分布的固结PVD沉积物的解析解决方案

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Purpose It is well known that the prefabricated vertical drain (PVD) installation process generates a significant soil disturbance around PVD. This disturbed zone significantly affects the rate of settlement and excess pore pressure dissipation. However, the characteristics of these zones were still uncertain and difficult to quantify; there remains large discrepancy among researchers. This study aims to develop a simple analytical solution for radial consolidation analysis of PVD-installed deposit considering mandrel-induced disturbance. Design/methodology/approach The proposed solution takes into account the nonlinear distributions of both horizontal hydraulic conductivity and compressibility toward the drain. The proposed solution was applied to analyze field behavior of test embankment in New South Wales, Australia. Findings Both effects significantly increased the time required to achieve a certain degree of consolidation. The effect of hydraulic conductivity on the consolidation rate was more significant than the effect of compressibility variation. And, the increased compressibility in the soil-disturbed zone due to mandrel installation significantly increased vertical strain of the PVD-improved soil deposit. The predicted results using the proposed analytical solution were in good agreement with the field measurements.
机译：目的众所周知，预制垂直排水（PVD）的安装过程会在PVD周围产生严重的土壤干扰。该扰动区显着影响沉降速率和过多的孔隙压力耗散。但是，这些区域的特征仍然不确定，难以量化。研究人员之间仍然存在很大差异。这项研究旨在开发一种简单的分析解决方案，以考虑心轴引起的扰动对PVD安装的矿床进行径向固结分析。设计/方法/方法拟议的解决方案考虑了水平导水率和朝向排水口的可压缩性的非线性分布。提出的解决方案被应用于分析澳大利亚新南威尔士州测试路堤的现场行为。结果这两种效果都大大增加了达到一定程度的整合所需的时间。水力传导率对固结率的影响比可压缩性变化的影响更为显着。并且，由于安装了心轴，增加了土壤扰动区的可压缩性，从而显着增加了PVD改良土壤沉积物的垂直应变。使用所提出的分析解决方案的预测结果与现场测量结果非常吻合。

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