Shearing Strength of a Soft Clay Deposit Near Rio De Janeiro

This paper presents the analysis of an embankment failure over a soft clay deposit in the district of Caju, Rio de Janeiro. The uncommon feature of the analysis is related to the embankment's material, which is mainly composed of dumped sanitary and rubble fill, and the unconsolidated state of the subjacent clay layer. Index tests were performed to obtain geotechnical characteristics and a profile of the soft clay deposit, which were compared with a well-known Brazilian clay from the same area (Guanabara Bay). Oedometer tests, in situ and laboratory vane tests, standard penetration tests, and conventional triaxial tests were also carried out. Total stress calculations were used to interpret and back analyze the failure and also to obtain the mobilized shear strength at both the fill and clay foundation. It was concluded that for an embankment cohesion of 0–20 kPa, the ratio between the back-analyzed Cu and the in situ postfailure Cu has a magnitude similar to the soft clay sensitivity. Key words: case history, sanitary fill, soft clay.

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Settlement Prediction in a Vertical Drainage-Installed Soft Clay Deposit Using the Genetic Algorithm (GA) Back-Analysis

Marine Georesources and Geotechnology ◽

10.1080/10641190802620198 ◽

2009 ◽

Vol 27 (1) ◽

pp. 17-33 ◽

Cited By ~ 6

Author(s):

Hyun I. Park ◽

Borinara Park ◽

Yun T. Kim ◽

Dae J. Hwang

Keyword(s):

Genetic Algorithm ◽

Soft Clay ◽

Back Analysis ◽

Settlement Prediction ◽

Clay Deposit ◽

Vertical Drainage

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Analysis of field performance of embankments on soft clay deposit with and without PVD-improvement

Geotextiles and Geomembranes ◽

10.1016/j.geotexmem.2005.05.002 ◽

2005 ◽

Vol 23 (6) ◽

pp. 463-485 ◽

Cited By ~ 109

Author(s):

S SHEN ◽

J CHAI ◽

Z HONG ◽

F CAI

Keyword(s):

Soft Clay ◽

Field Performance ◽

Clay Deposit

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Permeability evaluation and its implications for consolidation analysis of an Italian soft clay deposit

Canadian Geotechnical Journal ◽

10.1139/t01-042 ◽

2001 ◽

Vol 38 (6) ◽

pp. 1166-1176 ◽

Cited By ~ 4

Author(s):

Giampaolo Cortellazzo ◽

Paolo Simonini

Keyword(s):

Finite Element ◽

Soft Clay ◽

Silty Clay ◽

The Finite Element Method ◽

Consolidation Process ◽

Permeability Characteristics ◽

Clay Deposit ◽

Consolidation Rate ◽

Permeability Evaluation

The present research concerns a comparative analysis of the possible methods for estimating soft silty clay permeability to be used in the analysis of consolidation. For this purpose the consolidation response of a thick and homogeneous, instrumented soft silty clay deposit, on which an embankment was constructed, is back-analyzed using the finite-element method. To model the consolidation process, permeability data are carefully determined both from laboratory and in situ piezocone tests. One-dimensional and triaxial permeability test data are compared with the results of piezocone dissipation tests, the latter interpreted using four different solutions. The effects of anisotropy on permeability characteristics influencing the consolidation rate are also discussed.Key words: consolidation, embankment, finite-element analyses, permeability, piezocone, soft silty clay.

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