Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The Thi Vai Container Port is constructed on reclaimed ground along the Thi Vai River in the Mekong delta approximately 90 km southeast of Ho Chi Minh City, Vietnam. The soil profile consists of an about 15 to 23 m thick deposit of soft, normally consolidated, highly compressible clay deposited on dense to compact sand. A soil improvement scheme was instigated aiming to reduce long-term settlement after construction of the facilities and improve the stability of the river bank. The scheme combined wick drains and, along the river bank, soil cement columns and toe revetments. The wick drains were installed at a spacing of about 1.5 m and a staged surcharge was placed to a maximum height of 6 through 6.6 m to bring about the consolidation of the clay. After a surcharge height of 4.7 m had been in place for about three months and the measured settlement was about 1.2 m, a slope failure occurred along about 200 m length of the riverbank. An investigation indicated that the three-month consolidation period had not increased clay undrained shear strength as anticipated and that the slope failure had broken the soil cement columns at about 11 m depth below the original ground surface. Costs to remedy the collapsed and damaged area amounted to about US$10 million. The paper presents the background information, soil failure details, results of bank stability analyses, and the solution chosen for the remedial construction.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Failure of Embankment on Soil-Cement Columns for Thi Vai Port, Vietnam

Chicago, Illinois

The Thi Vai Container Port is constructed on reclaimed ground along the Thi Vai River in the Mekong delta approximately 90 km southeast of Ho Chi Minh City, Vietnam. The soil profile consists of an about 15 to 23 m thick deposit of soft, normally consolidated, highly compressible clay deposited on dense to compact sand. A soil improvement scheme was instigated aiming to reduce long-term settlement after construction of the facilities and improve the stability of the river bank. The scheme combined wick drains and, along the river bank, soil cement columns and toe revetments. The wick drains were installed at a spacing of about 1.5 m and a staged surcharge was placed to a maximum height of 6 through 6.6 m to bring about the consolidation of the clay. After a surcharge height of 4.7 m had been in place for about three months and the measured settlement was about 1.2 m, a slope failure occurred along about 200 m length of the riverbank. An investigation indicated that the three-month consolidation period had not increased clay undrained shear strength as anticipated and that the slope failure had broken the soil cement columns at about 11 m depth below the original ground surface. Costs to remedy the collapsed and damaged area amounted to about US$10 million. The paper presents the background information, soil failure details, results of bank stability analyses, and the solution chosen for the remedial construction.