Excavation for Brigham Building for the Future in Boston. Courtesy East Coast Slurry.
Brigham Building for the Future is located in the Longwood Medical Area in Boston and is a reflection of Brigham and Women Hospital’s commitment to innovation and the integration of medical research and patient care. The 620,000-square-foot building features an 11-story research lab, a clinical facility, and a 460-car below-grade parking garage. The subgrade structure will house a six-story parking garage, an electric power generation facility, and an advanced imaging center. It was constructed using the up / up construction method to enable simultaneous construction of the substructure and the superstructure.
Because of Thornton Tomasetti’s strong analytical expertise in soil structure interaction using advanced soil constitute models in finite element programs, extensive experience and knowledge of subgrade construction in an urban environmental setting and of the local geology, the firm was retained to provide design services for the 210-foot-wide, 265-foot-long, below-grade excavation. Excavation depths vary from 48 feet deep for the parking garage and power generation facility up to 60 feet elsewhere.
The design for the excavation was developed using a slurry wall and multiple levels of bracing systems with the consideration of differential excavation depths among a garage, a generator facility and imaging center. The effect and influence of differential excavations were thoroughly investigated and evaluated for the design of the slurry wall and its temporary bracing system. The slurry wall design, bracing installation and removal were coordinated with the up / up construction sequencing to expedite the excavation and construction of subgrade structure.
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