|
|
|
Title: USE OF STRESS LOCI FOR DETERMINATION OF EFFECTIVE STRESS PARAMETERS
Accession Number: 00234401
Record Type: Component
Abstract: RECENT INVESTIGATIONS AND STUDIES HAVE SHOWN THAT THE LABORATORY-MEASURED VALUES FOR INTERNAL FRICTION AND COHESION C FOR SENSITIVE CLAYS ARE MUCH LARGER THAN THE CALCULATED FIELD VALUES. THE NEED FOR A BETTER CORRESPONDENCE IN MEASURED AND CALCULATED FIELD VALUES IN SUCH SOILS IS EVIDENT. THE STUDY DESCRIBED HEREIN WAS DESIGNED TO INVESTIGATE THE USE OF STRESS LOCI FOR DETERMINATION OF THE SHEAR PARAMETERS NOT ONLY FOR SENSITIVE SOILS BUT ALSO FOR NORMALLY CONSOLIDATED CLAYS, BECAUSE IT IS REALIZED THAT THE STATE OF STRESS IN A SOIL SPECIMEN AT ANY ONE CONDITION OF STRAIN IS AN INDICATION OF THE NATURE OF STRESS RESISTANCE DERIVED THEREIN. IN CONSOLIDATED UNDRAINED TRIAXIAL TESTS ON BOTH LABORATORY CONSOLIDATED AND FIELD-UNDISTURBED CLAYS, THE CURVE JOINING THE POINTS ON THE MOHR DIAGRAM REPRESENTING SHEAR AND EFFECTIVE NORMAL STRESS ON THE RUPTURE PLANE AT VARYING STAGES OF STRAIN HAS BEEN USED IN THIS STUDY TO INDICATE THE STRESS LOCUS. BY DEFINING THE FRICTION PARAMETER AS THAT PARAMETER IN THE SHEAR STRESS VS NORMAL STRESS REGION WHEREIN THE SHEAR STRESS INCREASES WITH THE EFFECTIVE NORMAL STRESS, AND THE COHESION PARAMETER AS THE PARAMETER IN THE SAME REGION WHERE THE SHEAR STRESS INCREASES DESPITE A DECREASE IN THE EFFECTIVE NORMAL STRESS, IT HAS BEEN POSSIBLE TO ARRIVE AT VALUES FOR THESE PARAMETERS WHICH CORRESPOND TO THE DIFFERENCE MEASURED BY RECENT INVESTIGATORS. USING CONVENTIONAL METHODS INVOLVING EFFECTIVE STRESSES, THE MEASURED ANGLE OF FRICTION FOR AN ILLITIC CLAY WAS 20 DEGREES. HOWEVER, USING THE STRESS LOCUS, THIS ANGLE WAS FOUND TO BE 10 DEGREES. ALTHOUGH THE COHESION PARAMETER WAS FOUND TO BE A FUNCTION OF THE CONSOLIDATION HISTORY FOR NORMALLY CONSOLIDATED CLAYS, ITS MAGNITUDE CAN ALSO BE DETERMINED FROM THE STRESS LOCUS AND EVALUATED FOR THE CORRESPONDING CONSOLIDATION OR OVERBURDEN PRESSURE. /AUTHOR/
Supplemental Notes: 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 Title: Monograph Accession #: 01410722
Authors: Yong, RVey, EDiscussers: Ladd, Charles C
Pagination: pp 38-51
Publication Date: 1962
Serial: Conference:
41st Annual Meeting of the Highway Research Board
Location:
Washington DC, United States Media Type: Print
Features: Figures
(11)
; References
(17)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways
Files: TRIS, TRB, ATRI
Created Date: Jul 22 1994 12:00AM
More Articles from this Serial Issue:
|
