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Settlement of Dynamically Compacted Deposits

by Robert G. Lukas, (M.ASCE), Ground Engineering Consultants, Inc, Deerfield, United States,
Norman H. Seiler, Ground Engineering Consultants, Inc, Deerfield, United States,



Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments

Abstract:

This paper compares predicted and measured settlements of deposits that were densified by means of dynamic compaction. Settlement records are presented for sites consisting of old, midage, and new landfill deposits, building rubble, and mine spoil. For sites that are comprised of inert materials, settlement after loading was rapid and directly related to the increase in pressure. Settlement predictions based upon standard penetration resistance or pressuremeter testing after site improvement are in reasonable agreement with measured values. At newer landfill sites, immediate compression as a result of new loading occurs relatively quickly, but long term compression from decomposition is large. Prediction of settlement from decomposition is possible but only approximately correct because of the variable ingredients of landfills and the difficulty of accurately measuring index parameters such as void ratio, unit weight or specific gravity from which estimates of secondary compression indices can be made.

Subject Headings: Soil settlement | Penetration tests | Landfills | Dynamic loads | Structural settlement | Soil compression | Pressure measurement

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