Journal
MARINE GEORESOURCES & GEOTECHNOLOGY
Volume 33, Issue 6, Pages 532-541Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/1064119X.2014.954180
Keywords
field measurement; prefabricated vertical drain; soft clay; undrained shear strength
Funding
- National Nature Science Foundation of China (NSFC) [41372283]
- National Basic Research Program of China (973 Program) [2015CB057800]
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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, C-u, 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, C-u, increased as the construction progressed, and the shear strength incremental ratio, C-u/p, decreased slightly with the degree of consolidation, U.
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