ANALYZING FIELD DATA FOR RAPID SETTLEMENTS (ABRIDGEMENT)

The square root of adjusted time method is one that uses the rate of settlement after the fill is complete, when only consolidation settlement is occurring, to separate the rapid from the consolidation settlement during filling. The rate of settlement is determined from settlement platform observations. The square root of time is a curve-fitting technique for analyzing data from the one-dimensional consolidation test and has been shown to be valid for other boundary conditions. To analyze for rapid settlements by this method, the observed settlements after the entire load is in place are plotted against the square root of adjusted time. The validity of this technique was verified by comparing the rapid settlement results from it with the results from using an analysis involving percent consolidation. The study concluded that this simple method gives good results for most drainage conditions. However, in clays whose coefficient of consolidation varies significantly, piezometer data will also be needed. A discussion which follows the paper commments that the methods described here are useful when good settlement and excess pore-pressure data are available on a project having a compressible stratum such as varved clay. However, the boring and test data and experience from various other projects indicate that it is probable that settlement of the loose strata above the varved clay at the location studied, may have influenced the rapid settlement results.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1976/616/616-016.pdf
• Summary URL:
  https://scholar.google.com/scholar_lookup?title=ANALYZING+FIELD+DATA+FOR+RAPID+SETTLEMENTS+(ABRIDGEMENT)&author=R.+Long&author=K.+Healy&publication_year=1976
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309025958
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Embankments and Earth Slopes. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Long, Richard P
  • Healy, Kent A
• Discussers:
  • Keene, Philip
• Publication Date: 1976

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 74-77
• Monograph Title: Soil mechanics: rutting in asphalt pavements, embankments on varved clays and foundations
• Serial:
  • Transportation Research Record
  • Issue Number: 616
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Clay; Curve fitting; Field studies; Ground settlement; Pore pressure; Soil consolidation test; Soil mechanics; Soils; Studies; Time
• Uncontrolled Terms: Field data
• Old TRIS Terms: Settlement rate
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00163003
• Record Type: Publication
• ISBN: 0309025958
• Files: TRIS, TRB
• Created Date: Oct 13 1977 12:00AM