UNCERTAINITY ANALYSIS OF SETTLEMENT RATE (ABRIDGEMENT)

In the analysis presented here, a simplified expression for the average degree of consolidation and a probabilistic approach to the time versus settlement relation are developed for a homogeneous clay stratum. The total settlement and the average degree of consolidation are considered as random variables, and the probability density function of the latter is combined with the probability distribution for the total settlement to develop the probability distribution of the time versus settlement curve. Although this study includes a large variety of different soils, the specific influences of the soil origin, the sampling techniques, and the detailed testing procedures on the data are not explicity treated; Based on the probabilistic analysis reported here, the following conclusions can be advanced: The uncertainty associated with the evaluation of the coefficient of consolidation at a certain consolidation pressure can be adequatley described by a normal destribution. The reverse lognormal distribution with a location parmeter equal to one apperas to satisfactorily describe the average degree of consolidation. The time versus settlement relation can be expressed in a probabilistic design by a lognormal distribution. If the number of samples is reasonably large, the distribution of the time-dependent settlement ratio will be approximately normal, with the standard deviation being inversely proportional to the equivalent number of independent soil samples.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1976/616/616-018.pdf
• Summary URL:
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Mechanics of Earth Masses and Layered Systems.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:
  • El-Moursi, Houssam H
  • Corotis, Ross B
  • Krizek, Raymond J
• Publication Date: 1976

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 81-84
• 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; Consolidations; Density; Distributions (Statistics); Sampling; Soils; Standard deviation; Time dependence; Uncertainty
• Old TRIS Terms: Density functions; Settlement rate; Soil sampling
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00163005
• Record Type: Publication
• ISBN: 0309025958
• Files: TRIS, TRB
• Created Date: Oct 13 1977 12:00AM