GZA Weaves Safety Net for Sinking Historic Boston Building-PPT Presentation

PPT Presentation

Pdf Summary

GZA provided geotechnical, structural, environmental, and construction-phase services to address settlement at a historic building in Cambridge, Massachusetts. The site’s oldest building dates to 1875 and was once home to the nation’s first cotton fishing-net manufacturer; it was added to the National Register of Historic Places in 1982.<br /><br />Building #2 was founded on granite walls and pile caps supported by timber piles. An apparent groundwater-level decline contributed to deterioration of the pile tops and uneven settlement, causing cracks and deformation in foundations, walls, windows, floors, and timber framing.<br /><br />GZA designed supplemental foundation support to reduce further settlement and protect the structure. The system included reinforced-concrete knee walls, grade beams and ring beams, along with helical “Drivecast” piles. During construction, GZA provided site oversight, quality assurance and quality control, reviewed contractor submittals, and coordinated the handling and disposal of contaminated excavated soils.<br /><br />Because pile installation presented challenges—including difficult soil conditions, cobbles, settlement during construction, and the building’s continued use—GZA also implemented intensive deformation monitoring. An automated system tracked lateral and vertical movement and sent real-time email alerts when thresholds were exceeded.<br /><br />The presentation describes GZA’s approach as a coordinated, multidisciplinary effort that delivered practical foundation solutions and monitoring beyond the project’s basic requirements.

Keywords

geotechnical engineering

historic building settlement

foundation stabilization

Cambridge Massachusetts

timber piles

helical piles

structural remediation

groundwater decline

deformation monitoring

contaminated soil disposal