LOAD STUDY OF FLEXIBLE PIPES UNDER HIGH FILLS

EARTH LOAD TESTS WERE CONDUCTED ON THREE 7-FOOT-DIAMETER CORRUGATED-METAL PIPES UNDER 137 FEET OF FILL. EACH PIPE WAS 512 FEET LONG ON A GRADE OF 2.5 PERCENT WITH 6 INCHES OF PARABOLIC CAMBER AT THE CENTER. PIPES WERE FILLED STRUTTED TO 3 PERCENT ELLIPTICAL CROSS-SECTION WITH LONG AXIS VERTICAL. THE FILL TO A HEIGHT OF 3 FEET ABOVE THE PIPE WAS COMPOSED OF A GRANULAR MATERIAL OF 100 PERCENT PROCTOR DENSITY. AT A FILL HEIGHT OF 10 FEET, A 7-FOOT-WIDE AND 7-FOOT-DEEP TRENCH WAS CUT OVER EACH PIPE AND BACKFILLED WITH LOOSE UNCOMPACTED MATERIAL BEFORE PROCEEDING WITH NORMAL FILL OPERATIONS. THE REMAINDER OF THE FILL WAS PLACED IN 3-FOOT LIFTS COMPACTED BY SHEEPSFOOT ROLLERS. LOADS WERE DETERMINED USING LOAD CELLS PLACED BETWEEN THE SILLS AND THE STRUTS, AND BY ATTACHING SR-4 STRAIN GAGES TO THE PIPE ON THE NEUTRAL AXIS OF THE CORRUGATIONS. DEFLECTION AND SUBSIDENCE MEASUREMENTS WERE ALSO MADE. STRAIN-GAGE DATA REVEALED THAT EACH INCREMENT OF FILL ADDED ITS LOAD INCREMENT IN DIRECT PROPORTION. DEFLECTION AND SUBSIDENCE OF THE PIPE WERE WITHIN DESIGN LIMITS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/125/125-001.pdf
• Supplemental Notes:
  • No 125, pp 1-11, 12 FIG, 4 TAB, 2 REF, 1 APP 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:
  • Timmers, John H
• Publication Date: 1956

Media Info

• Media Type: Digital/other
• Pagination: 11p
• Monograph Title: Flexible culverts under high fills
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 125
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Backfilling; Conduits; Corrugated pipe culverts; Deflection tests; Earth; Fills; Flexible structures; Granular materials; Load tests; Sheepsfoot rollers; Strain gages; Subsidence (Geology)
• Old TRIS Terms: Backfills; Flexible conduits
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216688
• Record Type: Publication
• Report/Paper Numbers: HS-023 499
• Files: TRIS, TRB
• Created Date: Sep 16 1994 12:00AM