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Large-strain consolidation analysis of PVD-installed soft soil considering the discharge capacity variation according to depth and time

Ba-Phu Nguyen (Department of Civil Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam)
Ananta Man Singh Pradhan (Water Resource Research and Development Centre, Ministry of Energy, Water Resources and Irrigation, Government of Nepal, Kathmandu, Nepal)
Tan Hung Nguyen (Department of Civil Engineering, Can Tho University of Technology, Can Tho, Vietnam)
Nhat-Phi Doan (Department of Civil Engineering, Kyungpook National University, Daegu, Republic of Korea)
Van-Quang Nguyen (Department of Civil and Environment Engineering, Hanyang University, Seoul, Republic of Korea and Department of Civil Engineering, Vinh University, Vinh, Vietnam)
Thanh-Canh Huynh (Department of Civil Engineering, Duy Tan University, Da Nang, Vietnam; Center for Construction, Mechanics and Materials, Institute of Research and Development, Duy Tan University, Da Nang, Vietnam)

Engineering Computations

ISSN: 0264-4401

Article publication date: 28 August 2020

Issue publication date: 17 June 2021

233

Abstract

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.

Keywords

Acknowledgements

The support of this research by the Industrial University of Ho Chi Minh City is gratefully acknowledged.

Citation

Nguyen, B.-P., Pradhan, A.M.S., Nguyen, T.H., Doan, N.-P., Nguyen, V.-Q. and Huynh, T.-C. (2021), "Large-strain consolidation analysis of PVD-installed soft soil considering the discharge capacity variation according to depth and time", Engineering Computations, Vol. 38 No. 4, pp. 1652-1676. https://doi.org/10.1108/EC-05-2020-0253

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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