Evaluation of the Strength Increase of Marine Clay under Staged Embankment Loading: A Case Study

H.-N. Wu, S.-L. Shen, L. Ma, Zhenyu Yin, S. Horpibulsuk

Research output: Journal article publicationJournal articleAcademic researchpeer-review

81 Citations (Scopus)

Abstract

© 2015, Copyright © Taylor & Francis Group, LLC.This article presents a case history of the performance of a full-scale test embankment constructed on a marine soft clay deposit improved by prefabricated vertical drains (PVDs) in the east of China. For analyzing the subsoil behavior, a 2D FEM model is established, in which the PVD-improved effect is considered by a simplified method of equivalent vertical hydraulic conductivity. The calculated results can predict the settlement behavior well; however, the FEM gives an underestimate for the value of excess pore pressures and it predicts similar values for the dissipation rate of excess pore pressures. The measured undrained shear strength of subsoil, Cu, is compared with the predicted value based on Ladd's empirical equation and the Modified Cam-Clay model (MCC). The shear strength predicted by Ladd's equation agrees well with the measured value, whereas the MCC overestimates the ability to improve subsoil shear strength during consolidation. The undrained shear strength of subsoil, Cu, increased as the construction progressed, and the shear strength incremental ratio, ?Cu/?p', decreased slightly with the degree of consolidation, U.
Original languageEnglish
Pages (from-to)532-541
Number of pages10
JournalMarine Georesources and Geotechnology
Volume33
Issue number6
DOIs
Publication statusPublished - 2 Nov 2015
Externally publishedYes

Keywords

  • field measurement
  • prefabricated vertical drain
  • soft clay
  • undrained shear strength

ASJC Scopus subject areas

  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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