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Mass and Main

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Mass and Main in 1910

Braced Excavation
Mass and Main in 1910 Braced Excavation

Location: Cambridge, MA
Owner: Watermark Central Venture LLC
Completion Date: January, 2018
General Contractor: John Moriarty and Associates

Vital Statistics:
Project Value: $3,500,000.00
Wall Type: 30 Reinforced Concrete Wall
Wall Area: 24,400 S.F.
Max. Excavated Depth: 66'

Project Description:
This site was in close proximity to the MBTA Red Line tunnel, built in the early 1900s, and several other abutting buildings. A stiff impervious excavation support system was necessary to control lateral movements during general excavation. An internally braced concrete diaphragm wall was constructed to provide temporary earth support and to serve as the permanent foundation wall. The slurry wall was designed as a load-bearing wall supporting vertical exterior wall and column loads through a combination of structural shear connection between the slurry wall and the footing/mat foundation, and on skin friction from the portion of the slurry wall extending below the bottom of the mat. A future storm water storage tank and 63 diameter pipe was planned to cross below the MBTA Red Line Tunnel in Massachusetts Avenue at a depth of 50 ft below street grade and parallel to the east side slurry wall. The slurry wall panels in this area were extended to 5 feet below the invert of the future pipe to mitigate potential impacts on the newly constructed building.


Panel Excavation Adjacent to Red Line Tunnel

Panel Excavation Adjacent to Red Line Tunnel
Panel Excavation Adjacent to Red Line Tunnel

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

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