01340941

Component

Tunneling induced settlement is often a controlling factor in the design of a subway or underground facility due to the impact on adjacent or overhead infrastructure. A method that takes an acceptable ground surface settlement profile and relates it to a tunnel or tunnel system configuration that will produce an acceptable/tolerable settlement profile is proposed. Also included in this paper is a brief discussion of existing methods of tunnel settlement analysis as well as two (2) case studies illustrating the proposed method. The chosen case studies are urban subgrade rail tunnels (subways) constructed in Istanbul, Turkey and Bangkok, Thailand. Each case study illustrates the use of the iterative static back calculation - finite element model prediction/solution method. The initial settlement profiles used for both case histories were literature obtained measured settlement profiles. These settlement profiles were assumed to be the tolerable settlement profiles for the subway systems. For each case history, the iterative static back calculation – finite element model ingested the individual literature obtained design settlement profile to identify an optimum tunnel configuration (depth and size) that will reproduce the design settlement profile. Comparisons were made between the as-built tunnel configuration and the predicted tunnel configuration.

01329018

11-3649

English

14p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures (10) ; References; Tables (2)

Backcalculation; Finite element method; Geotechnical engineering; Ground settlement; Railroad tunnels; Soil profiles; Subways

Bangkok (Thailand); Istanbul (Turkey)

Bridges and other structures; Geotechnology; Railroads; I25: Design of Tunnels

Transportation Research Board Annual Meeting 2011 Paper #11-3649

TRIS, TRB

Feb 17 2011 6:35PM