SETTLEMENT BEHIND BRIDGE ABUTMENTS. THE PERFORMANCE OF A UNIFORMLY-GRADED SAND FILL IN AN APPROACH EMBANKMENT ON THE M4 MOTORWAY

AN INVESTIGATION WHICH IS ONE OF A SERIES TO DETERMINE WHETHER IT IS NECESSARY TO PLACE RESTRICTIONS ON FILL MATERIALS USED IN CONSTRUCTING APPROACH EMBANKMENTS BEHIND BRIDGE ABUTMENTS IS DESCRIBED. UNIFORMLY-GRADED FINE TO MEDIUM SAND WAS EXAMINED AND COMPARED WITH THE PERFORMANCE OF A WELL-GRADED SANDY GRAVEL. MEASUREMENTS WERE MADE ON COMPACTION OF THE FILL MATERIALS AND RECORDS OBTAINED FOR THE SETTLEMENTS OF THE ROAD SURFACE AND SUBSOIL. AFTER FOUR YEARS THE SETTLEMENTS WITHIN BOTH THE 7 M HIGH SAND AND GRAVEL FILLS WERE NEGLIGIBLE. HOWEVER, SETTLEMENTS OF UP TO 40 MM WERE RECORDED IN THE SUBSOIL BENEATH THE FILL MATERIALS DUE TO CONSOLIDATION OF THE UNDERLYING CLAY. THIS LED TO THE OCCURENCE OF SMALL DIFFERENTIAL SETTLEMENTS OF UP TO 26 MM SPREAD OVER A MINIMUM LENGTH OF 17 M. THESE DIFFERENTIAL SETTLEMENTS ARE SO SMALL THAT THE RIDING QUALITY OF THE ROAD HAS NOT BEEN AFFECTED. THE UNIFORMLY-GRADED FINE TO MEDIUM SAND PERFORMED AS WELL AS THE WELL-GRADED SANDY GRAVEL AND WHEN WELL COMPACTED, CAN BE USED AS A SATISFACTORY FILL MATERIAL BEHIND ABUTMENTS. /RRL/A/

  • Supplemental Notes:
    • Rrl Rept Lr 310, 17 PP, 9 FIG, 1 TAB, 1 PHOT, 6 REF
  • Corporate Authors:

    MINISTRY OF TRANSPORT, LONDON (UK)

    ,    
  • Authors:
    • Cross, J E
  • Publication Date: 0

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Filing Info

  • Accession Number: 00232246
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 1 1971 12:00AM