ANALYSIS FOR THE EVALUATION OF THE SETTLEMENT RATIO FOR RIGID POSITIVE PROJECTING CONDUITS
THE SETTLEMENT RATIO IS A PARAMETER USED IN LOAD FORMULAS OF POSITIVE PROJECTING CONDUITS. ITS VALUE IS REQUIRED TO DETERMINE THE HEIGHT OF THE PLANE OF EQUAL SETTLEMENT. THE SETTLEMENT RATIO IS DEFINED AS THE RATIO OF THE DIFFERENCE OF THE ADDITIONAL SETTLEMENT OF THE TOP OF THE CONDUIT AND THE ADDITIONAL SETTLEMENT OF THE CRITICAL PLANE IN THE EXTERIOR PRISM TO THE ADDITIONAL CONSOLIDATION OF THE EMBANKMENT MATERIAL BELOW THE CRITICAL PLANE. THIS EQUATION IS GIVEN, ALSO THAT FOR DETERMINING THE HEIGHT OF EQUAL SETTLEMENT. THE PRESENT METHOD OF ESTIMATING THE VALUE OF THE SETTLEMENT RATIO IS BY JUDGEMENT COUPLED WITH KNOWN BOUNDARY VALUES. ITS VALUE CAN BE DETERMINED AFTER A CONDUIT IS INSTALLED, IF PROVISIONS ARE MADE DURING THE INSTALLATION TO OBTAIN CERTAIN MEASUREMENTS. THE ANALYTICAL DERIVATION FOR THE EXPRESSION OF SETTLEMENT RATIO IS BASED ON THE CONCEPT OF THE EXISTENCE OF A LOWER PLANE OF EQUAL SETTLEMENT EITHER IN THE YIELDING FOUNDATION OR AT THE UPPER SURFACE OF A NONYIELDING FOUNDATION. THE PARAMETERS USED IN THE DERIVED EXPRESSION OF SETTLEMENT RATIO CAN BE READILY DETERMINED FOR THE PARTICULAR SITE CONDITIONS FOR WHICH THE CONDUIT IS INSTALLED. ASSUMPTIONS MADE IN THE DERIVATION ARE GIVEN. FOUR CASES, REPRESENTED BY DRAWINGS, WERE CONSIDERED SEPARATELY. THE CASES WERE FOR THE VALUE OF SETTLEMENT RATIO WITH /1/ CONDUIT RESTING IN OR ON NONYIELDING FOUNDATIONS WITH EMBANKMENT EXTENDING TO THE NONYIELDING FOUNDATION, /2/ CONDUIT RESTING ON NONYIELDING SUPPORT WITH COMPRESSIBLE FOUNDATION MATERIALS ADJACENT TO THE CONDUIT, /3/ CONDUIT RESTING ON YIELDING FOUNDATION MATERIAL OF SUFFICIENTLY GREAT DEPTH, AND /4/ CONDUIT RESTING ON YIELDING FOUNDATION MATERIAL OF SHALLOW DEPTH.
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Supplemental Notes:
- Paper sponsored by Committee on Culverts and Culvert Pipe and presented at the 45th Annual Meeting. 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
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Authors:
- Doubt, Paul D
- Publication Date: 1966
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 1-13
- Monograph Title: Pipe culverts
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Serial:
- Highway Research Record
- Issue Number: 144
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Analysis; Conduits; Depth; Evaluation; Foundations; Functions (Mathematics); Ratios; Settlement (Structures); Stiffness
- Uncontrolled Terms: Rigid
- Old TRIS Terms: Derivation; Foundation conditions; Positive; Projection; Settlement rate; Yield
- Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; Materials;
Filing Info
- Accession Number: 00204071
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Nov 18 1994 12:00AM