Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

In the framework of “Radès-La Goulette“bridge project (Tunisia), this study focuses on the construction of embankments located in north Lake of Tunis. These embankments with averaged height of about 6 m are founded on highly compressible clayey sand and muddy sand layers. A soil improvement technique is then imposed, to overcome the lack of low bearing capacity and high pronounced settlements. Two solutions of soil improvement have been studied; the first one consists in vertical “Geodrains” drilled until 10 m depth associated with step by step construction of preloading embankment. The second technique is stone columns reinforcement up to 10 m depth. It is focused at estimation of bearing capacity and prediction of settlement of reinforced soil by handling the recent elaborated software programme “Columns”. The evolution of consolidation settlement of embankments as a function of time is also considered. The consolidation of improved soil is studied by using the “poroelastic” prediction model and the Barron’s theory. A comparison between the two soil improvement techniques from the technical and economical viewpoints is presented. Compared to the “Geodrains” technique, the reinforcement by stone columns including the execution of embankments approximately leads to a gain of eight months and slightly cost reduced.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Comparison Between Stone Columns and Vertical Geodrains with Preloading Embankment Techniques

Arlington, Virginia

In the framework of “Radès-La Goulette“bridge project (Tunisia), this study focuses on the construction of embankments located in north Lake of Tunis. These embankments with averaged height of about 6 m are founded on highly compressible clayey sand and muddy sand layers. A soil improvement technique is then imposed, to overcome the lack of low bearing capacity and high pronounced settlements. Two solutions of soil improvement have been studied; the first one consists in vertical “Geodrains” drilled until 10 m depth associated with step by step construction of preloading embankment. The second technique is stone columns reinforcement up to 10 m depth. It is focused at estimation of bearing capacity and prediction of settlement of reinforced soil by handling the recent elaborated software programme “Columns”. The evolution of consolidation settlement of embankments as a function of time is also considered. The consolidation of improved soil is studied by using the “poroelastic” prediction model and the Barron’s theory. A comparison between the two soil improvement techniques from the technical and economical viewpoints is presented. Compared to the “Geodrains” technique, the reinforcement by stone columns including the execution of embankments approximately leads to a gain of eight months and slightly cost reduced.