SYMPOSIA PAPER Published: 01 January 1992

Performance of an Internally Braced Slurry-Diaphragm Wall for Excavation Support


This paper presents the construction performance of an internally braced diaphragm wall constructed by the slurry trench method at a waterfront site on the Boston Harbor in Massachusetts. Due to the proximity of an existing building, waterfront structures and the harbor, as well as the unfavorable subsoil conditions, a cross-lot bracing system was selected for excavation support. The earth support system was instrumented by inclinometers and strain gages, and the existing abutting building was monitored by settlement reference points. Instrumentation data allowed monitoring of performance of the excavation support system as well as settlements in the existing adjacent building during the foundation construction.

The performance data indicated significantly unsymmetrical lateral displacements of the opposite diaphragm walls resulting from the unequal loads imposed by the building surcharge on one side as well as the limited soil mass on the opposite harbor side. Also, the daily collected data made it possible to take quick remedial action on the lateral support system at the time of a critical incident.

Author Information

Bono, NA
Liu, TK
Soydemir, C
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Developed by Committee: D18
Pages: 347–360
DOI: 10.1520/STP19744S
ISBN-EB: 978-0-8031-5191-8
ISBN-13: 978-0-8031-1427-2