Slurry Walls Protect Harvard Square

by Eldon L. Abbott, (M.ASCE), Asst. Vice Pres.; Parsons Brinckerhoff Quade & Douglas, Boston, MA 02116,
William H. Hansmire, (M.ASCE), Sr. Prof. Assoc.; PBQD, Boston, MA 02116,
Robert P. Rawnsley, (A.M.ASCE), Staff Engineer; PBQD, Boston, MA 02116,

Serial Information: Civil Engineering—ASCE, 1985, Vol. 55, Issue 12, Pg. 44-47

Document Type: Feature article


Harvard Square Station, Cambridge, Mass., had to be rebuilt when Boston's Red Line Subway was extended further out to the suburbs. For the first time, tied back slurry walls built to protect adjacent historic buildings were incorporated into the permanent subway structure. The station structure was designed for the maximum anticipated total loads. Lateral forces are taken by the reinforced concrete walls with beam action between the roof and invert support points. Vertical loads are transmitted to the foundation soil or rock. Regroutable, multi-strand tiebacks were installed to design capacities ranging from 70 to 140 tons. A monitoring program confirmed design predictions that there would be no significant movement within the slurry walls and adjacent ground.

Subject Headings: Vertical loads | Slurries | Slurry walls | Subways | Load factors | Reinforced concrete | Concrete beams | Suburbs

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