Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Settlements remain the major concern during the construction and along the life of a roadway embankment built over soft soils. A foundation ground reinforced by a system of rigid piles is an effective solution; it reduces and homogenizes the surface settlements. Rigid piles reinforcement system has been strongly developed in France for the last fifteen years, however, confrontations of several design used methods highlighted important variations in results. This results in implementing a French National Research Project A.S.I.RI. (Grounds Improvement by Rigid Inclusions) gathering construction companies, engineering and design departments, universities and research centers. This project aims to propose guidelines for the design, and the construction of reinforced soils by rigid inclusions. After a short presentation of the technique, this article is devoted to two French case studies of ground improvement by rigid piles, the Senette’s street and the Ramp of Glain examples. In both cases a roadway embankment is intended to be supported by soft soil. The compressible soils are soft sandy clay from alluvial origin. The performance of the embankment supporting system is assessed based on monitoring data obtained from various instruments installed during construction including settlement cells, inclinometers, piezometers, total stress cells and Geodetect settlement strip. The study was made with finite differences and finite elements numerical tools. Some analytical methods are used. A confrontation between experimental, analytical and numerical results is then presented.

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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Soft Ground Improved by Rigid Vertical Piles. Experimental and Numerical Study of Two Real Cases in France

Arlington, Virginia

Settlements remain the major concern during the construction and along the life of a roadway embankment built over soft soils. A foundation ground reinforced by a system of rigid piles is an effective solution; it reduces and homogenizes the surface settlements. Rigid piles reinforcement system has been strongly developed in France for the last fifteen years, however, confrontations of several design used methods highlighted important variations in results. This results in implementing a French National Research Project A.S.I.RI. (Grounds Improvement by Rigid Inclusions) gathering construction companies, engineering and design departments, universities and research centers. This project aims to propose guidelines for the design, and the construction of reinforced soils by rigid inclusions. After a short presentation of the technique, this article is devoted to two French case studies of ground improvement by rigid piles, the Senette’s street and the Ramp of Glain examples. In both cases a roadway embankment is intended to be supported by soft soil. The compressible soils are soft sandy clay from alluvial origin. The performance of the embankment supporting system is assessed based on monitoring data obtained from various instruments installed during construction including settlement cells, inclinometers, piezometers, total stress cells and Geodetect settlement strip. The study was made with finite differences and finite elements numerical tools. Some analytical methods are used. A confrontation between experimental, analytical and numerical results is then presented.