Nicholson provided ground improvement for a new 5-story office building constructed on loose to medium dense interbedded silty sand and sandy silt with clay. To mitigate liquefaction and reduce settlement, Nicholson installed 550 stone columns to a maximum depth of 34 feet using dry-bottom-feed methods. With the dry-bottom-feed method, the vibroprobe is inserted into the ground and penetrates to the target depth under its own weight and compressed air jetting. Nicholson designed the stone column treatment depth and replacement ratio.
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