Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

With increase in the dynamic envelope of trains due to the increase of their cross section and speed, the need for widening tunnel cross section of existing tunnels is becoming a necessity. One of the solutions to this problem consists of cutting a fraction of the masonry liner thickness and replacing it with a higher strength, and therefore, a thinner material. In this paper, the case of the widening of the Roches de Condrieu tunnel on the Paris to Marseilles railway line is presented. A maximum of half of the thickness of the existing masonry liner should be removed somewhere between the tunnel crown and the springline. Three-dimensional finite element analysis was used to simulate the effect of this partial cutting of the liner over a limited specified length along the tunnel axis. This study allowed the determination of the maximum length of cutting along the tunnel axis without creating any stability problem for the tunnel section. Once the section cut is reinforced by a higher strength material such as steel fiber reinforced shotcrete, the work resumed with alternating panels.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Analysis of Tunnel Section Enlargement Through Cutting Masonry Liner (Paris-Marseilles Roches De Condrieu Railway Tunnel Case Study)

New York, New York

With increase in the dynamic envelope of trains due to the increase of their cross section and speed, the need for widening tunnel cross section of existing tunnels is becoming a necessity. One of the solutions to this problem consists of cutting a fraction of the masonry liner thickness and replacing it with a higher strength, and therefore, a thinner material. In this paper, the case of the widening of the Roches de Condrieu tunnel on the Paris to Marseilles railway line is presented. A maximum of half of the thickness of the existing masonry liner should be removed somewhere between the tunnel crown and the springline. Three-dimensional finite element analysis was used to simulate the effect of this partial cutting of the liner over a limited specified length along the tunnel axis. This study allowed the determination of the maximum length of cutting along the tunnel axis without creating any stability problem for the tunnel section. Once the section cut is reinforced by a higher strength material such as steel fiber reinforced shotcrete, the work resumed with alternating panels.