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Title:

FOUNDATION FAILURE OF NEW LISKEARD EMBANKMENT

Accession Number:

00236770

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309021960

Abstract:

A CASE HISTORY OF AN EMBANKMENT FOUNDATION FAILURE IN VARVED CLAY IS PRESENTED. STABILITY ANALYSES BY TOTAL STRESS, PARTIAL TOTAL STRESS, EFFECTIVE STRESS, AND FINITE ELEMENTS HAVE BEEN OBTAINED AND ARE DISCUSSED. ATTENTION IS FOCUSED ON THE PERFORMANCE OF THE STIFF CRUST, THE SELECTION OF THE SOIL PROPERTIES, AND THE PLACEMENT OF THE INSTRUMENTATION. THE SITE GEOLOGY AND SOIL PROPERTIES OF SAMPLES TAKEN WITH A COMMERCIAL SAMPLE TUBE ARE DISCUSSED. THE INSTRUMENTATION TO MEASURE PORE RESPONSE (ILLUSTRATED) WAS PLACED ON THE EMBANKMENT SITE A YEAR PRIOR TO CONSTRUCTION. FIGURES ILLUSTRATE THE RESPONSE MEASURED IN THE PIEZOMETERS. THE METHOD USED IN THE TOTAL STRESS AND PARTIAL TOTAL STRESS ANALYSIS IS DESCRIBED. DETAILS ARE GIVEN OF EFFECTIVE STRESS ANALYSIS AND FINITE ELEMENT TOTAL STRESS ANALYSIS. CONCLUSIONS DRAWN FROM THE EXPERIENCE ARE PRESENTED. THE NEAR FAILURE EXCESS PORE PRESSURES IN THE FOUNDATION MATERIAL MAY BE CALCULATED WITH SUFFICIENT ACCURACY FOR PRACTICAL PURPOSES FROM A BOUSSINESQ STRESS DISTRIBUTION INCREASE AND SKEMPTON'S PORE PRESSURE COEFFICIENTS. THE ASSIGNMENT OF SOIL STRENGTHS TO THE CRUST MATERIAL IS SEEN AS THE MAJOR PROBLEM IN USING UNDRAINED TEST RESULTS IN A TOTAL STRESS ANALYSIS. BOTH ACTUAL FAILURE AND THE ESTIMATED FAILURE CIRCLES WERE FOUND TO BE VERY SHALLOW, EXTENDING GENERALLY TO A DEPTH LESS THAN 19.7 FEET (6 M). THE USE OF THE MOST REALISTIC EFFICTIVE STRESS ANALYSIS PARAMETERS (I.E. WITH UNDRAINED EXCESS PORE PRESSURES THROUGHOUT THE MASS) RESULTED IN A VERY SHALLOW, UNREALISTIC SLIP CIRCLE ALTHOUGH THE FACTOR OF SAFETY WAS ONLY SLIGHTLY TOO LARGE. THE FINITE ELEMENT ANALYSIS WAS FOUND TO BE USEFUL IN PREDICTING THE FAILED AREA BY USING A PSEUDO TOTAL STRESS ANALYSIS, PROVIDED MULTILINEAR STRESS- STRAIN PROPERTIES WERE USED.

Supplemental Notes:

Sponsored by Committee on Soil and Rock Properties. 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.

Monograph Accession #:

00054617

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Raymond, Gerald P

Pagination:

pp 1-17

Publication Date:

1973

Serial:

Highway Research Record

Issue Number: 463
Publisher: Highway Research Board

Conference:

52nd Annual Meeting of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1973-1-22 to 1973-1-26

ISBN:

0309021960

Media Type:

Digital/other

Features:

Figures (14) ; References (25) ; Tables (4)

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Materials; Safety and Human Factors

Files:

TRIS, TRB

Created Date:

Apr 27 1974 12:00AM

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