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Massachusetts Water Resources Authority
North Dorchester Bay CSO Pump Station

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MWRA

Unbraced Slurry Wall Earth Support System For Future 60 Deep Pump Station.
Minipiles Will Provide Foundation Support for the CIP Pump Station.


Location: South Boston, MA
Owner: MWRA
Completion Date: March, 2010
General Contractor: Walsh Northeast

Vital Statistics:
Project Value: $2,180,000.00
Wall Type: 36 Reinforced Concrete Slurry Wall
Wall Area: 24,650 S.F. Max.
Excavated Depth: 97

Project Description:
The CSO Pump Station required a 60 deep excavation in soft soils. In order to facilitate the construction of the complex reinforced concrete structure of the Pump Station, it was desirable to have an un-braced lateral support of excavation. Easement restrictions would not accommodate a circular slurry wall and therefore the support of excavation was achieved with an elliptical slurry wall. Because of the same restrictions, the main axes of the ellipse had to be skewed with respect to those of the pump station. Tensile stresses at the inner face of the slurry wall that were expected to develop along the flat side of the ellipse, at the higher elevations, required the installation of welded stitching plates across selected panel joints.


MWRA

MWRA
Shaft Excavation Slurry Wall Panel Layout

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145 Island Street, Stoughton, MA 02072, 781-344-5700

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