A TECHNIQUE FOR MEASURING THE DISPLACEMENT VECTOR THROUGHOUT THE BODY OF A PAVEMENT STRUCTURE SUBJECTED TO CYCLIC LOADING
THE TEXAS TRANSPORTATION INSTITUTE IS CONDUCTING RESEARCH TO DEVELOP, FROM FULL-SCALE TESTING, A MATHEMATICAL MODEL THAT WILL ESTIMATE THE DISPLACEMENT VECTOR AT ANY GIVEN POINT WITHIN A PAVEMENT STRUCTURE SUBJECTED TO DYNAFLECT LOADING, GIVEN THIS VECTOR AT THE SURFACE, THE THICKNESS OF EACH LAYER, AND A STIFFNESS PARAMETER FOR EACH MATERIAL. THE DYNAFLECT TECHNIQUE OF APPLYING A CYCLIC FORCE MAKES IT POSSIBLE TO EMPLOY FOR DISPLACEMENT MEASUREMENT AN INERTIAL REFERENCE POINT THAT IS NOT SUSCEPTIBLE TO MEASUREMENT ERRORS CAUSED BY REFERENCE POINT MOTION. IN THIS STUDY AN EXTENSION OF THE DYNAFLECT MEASURING TECHNIQUE, EMPLOYING GEOPHONES AS DISPLACEMENT SENSORS, WAS ADOPTED. THE TECHNIQUE, WHICH IS DESCRIBED IN DETAIL, PROVED FIELDWORTHY. REPLICATION ERRORS OBSERVED ON INDIVIDUAL TEST SECTIONS WERE REASONABLY SMALL COMPARED TO VARIATIONS BETWEEN SECTIONS. THE OBSERVED VECTOR DISPLACEMENT FIELDS RESEMBLED FIELDS COMPUTED FOR A LAYERED ELASTIC SYSTEM TO WHICH AN EQUAL STATIC LOAD IS APPLIED. IT APPEARS FEASIBLE TO DETERMINE, FOR EACH SECTION, A SET OF ELASTIC LAYERS FOR WHICH THE COMPUTED DISPLACEMENT FIELDS WILL SUBSTANTIALLY MATCH THE OBSERVATIONS. IT SHOULD ALSO BE POSSIBLE TO FORMULATE A USEFUL AND PRACTICAL MATHEMATICAL MODEL REPRESENTING THE DISPLACEMENT RESPONSE OF THE PAVEMENT SECTIONS.
- Record URL:
-
Supplemental Notes:
- Sponsored by Committee on Pavement Condition Evaluation. 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:
- Moore, William M
- Swift, Gilbert
-
Conference:
- 51st Annual Meeting of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1972-1-17 to 1972-1-21
- Publication Date: 1972
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 87-101
- Monograph Title: Pavement technology
-
Serial:
- Highway Research Record
- Issue Number: 407
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Dislocation (Geology); Dynaflect; Flexible pavements; Mathematical models; Measurement; Pavement design; Pavements; Repeated loads; Theory
- Old TRIS Terms: Layered system mechanics
- Subject Areas: Highways; Pavements;
Filing Info
- Accession Number: 00207497
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: May 15 1973 12:00AM