Characterization of a Site Underlain by Deep Collapsing Soils

by Lawrence A. Hansen, Sergent, Hauskins & Beckwith, Geotechnical Engineers Inc, United States,
Robert D. Booth, Sergent, Hauskins & Beckwith, Geotechnical Engineers Inc, United States,
George H. Beckwith, Sergent, Hauskins & Beckwith, Geotechnical Engineers Inc, United States,



Document Type: Proceeding Paper

Part of: Foundation Engineering: Current Principles and Practices

Abstract: The geomorphic setting of a site underlain by an 80 ft (24 m) deep deposit of collapsing silty sand is described. The field and laboratory investigation completed to characterize the geotechnical profile is described and the results of 36 consolidation-collapse tests are summarized. A procedure for estimating the settlement due to post construction wetting of structures founded on the site is developed. Estimated settlements are compared to the performance of several groups of structures which had previously been constructed at the site, including one building which was demolished because of excessive differential foundation movements.

Subject Headings: Collapsible soils | Construction sites | Field tests | Structural settlement | Soil strength | Silt | Geotechnical investigation

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