Performance of T-Shaped Diaphragm Wall in a Large Scale Excavation

Routine deep excavation projects require the use of retaining wall in conjunction with supports either in the form of internal bracings or tie-backs to resist lateral earth pressure. This paper presents a case in which a T-shaped diaphragm wall is used in lieu of internal bracings or tie-backs for a 9.6 m deep excavation in sandy soil. The T-shaped diaphragm wall has a relatively high rigidity that can withstand lateral earth pressure without excessive wall movement, which is a design advantage when there are existing buildings near the construction site. As indicated by instrumentation readings, the observed lateral displacement of T-shaped diaphragm wall was less than 1.5 cm. Numerical analyses by a beam-on-elastic-foundation program indicated that high rigidity of the T-shaped diaphragm wall is not the only governing factor that leads to a less-than-expected wall displacement. Additional side frictions developed along buttress surfaces of the T-shaped wall is believed to help in significantly reducing wall displacement in this particular case.

並列關鍵字

Deep excavation ； T-shaped diaphragm wall

國際替代計量

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