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A platform for research: civil engineering, architecture and urbanism
Cutter Soil Mixing Excavation and Shoring in Seattle's Pioneer Square District
In order to make a 13.1 m (43 ft) deep excavation, a 20.7 m (68 ft) Cutter Soil Mixing (CSM) groundwater cutoff shoring system was constructed in Seattle. The wall alignment was pre-trenched to remove obstructions and the wall was constructed using cement-bentonite slurry technology. The lower aquifer was depressurized to stabilize the base of the excavation while the upper aquifer was monitored closely for unexpected drawdown, which could result in unacceptable settlement of adjacent structures. Underpinning micropiles were installed below the perimeter footing of an adjacent 8-story building. The southern portion of the new building is supported on drilled shafts where the site's triangular shape made excavation less efficient. Permanent tie-downs were installed to resist hydrostatic uplift forces after the dewatering wells are shut off because the water pressure on the base of the foundation is greater than the building's weight.
Cutter Soil Mixing Excavation and Shoring in Seattle's Pioneer Square District
In order to make a 13.1 m (43 ft) deep excavation, a 20.7 m (68 ft) Cutter Soil Mixing (CSM) groundwater cutoff shoring system was constructed in Seattle. The wall alignment was pre-trenched to remove obstructions and the wall was constructed using cement-bentonite slurry technology. The lower aquifer was depressurized to stabilize the base of the excavation while the upper aquifer was monitored closely for unexpected drawdown, which could result in unacceptable settlement of adjacent structures. Underpinning micropiles were installed below the perimeter footing of an adjacent 8-story building. The southern portion of the new building is supported on drilled shafts where the site's triangular shape made excavation less efficient. Permanent tie-downs were installed to resist hydrostatic uplift forces after the dewatering wells are shut off because the water pressure on the base of the foundation is greater than the building's weight.
Cutter Soil Mixing Excavation and Shoring in Seattle's Pioneer Square District
Lindquist, Doug (author) / Upsall, Ben (author) / Horvitz, Garry (author)
Earth Retention Conference (ER) 2010 ; 2010 ; Bellevue, Washington, United States
Earth Retention Conference 3 ; 303-310
2010-07-26
Conference paper
Electronic Resource
English
Cutter Soil Mixing Excavation and Shoring in Seattle's Pioneer Square District
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