Performance Of Urban Cofferdams Braced With Segmental Steel And Reinforced Concrete Ring Beams

Keywords

Case studies; Excavation; Ground movements; Observed performance; Reinforced concrete; Ring beams; Steel beams; Temperature effects; Time dependence; Urban cofferdam

Abstract

The performance of two urban cofferdams is presented in this paper. The first case history is a cofferdam built for the One Museum Park West structure (OMPW), braced with segmental steel ring beams. The second is a cofferdam braced with cast-in-place reinforced concrete ring beams. The main goal of this paper is to study the excavation-induced ground deformations arising from these two cofferdams built in similar geologic settings but different bracing systems, installation sequences, and material responses to time-dependent effects. The deformations at the OMPW cofferdam are attributed to the compliance in the overall retaining system caused by a large initial unsupported cantilever depth and gaps left open between segmental steel ring beams and sheet piles. For the cofferdam at Site 2, observed ground movements are attributed to a rapid construction sequence, low temperatures during concrete curing, and concrete material timedependent behavior of the concrete ring beams.

Publication Date

4-1-2018

Publication Title

Journal of Geotechnical and Geoenvironmental Engineering

Volume

144

Issue

4

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1061/(ASCE)GT.1943-5606.0001864

Socpus ID

85042019529 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85042019529

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