THE BEHAVIOUR OF STEEL H-PILES IN SLATY MUDSTONE

The viaduct piers carrying the Kingsteignton-Newton abbot by-pass over the teign estuary are supported by groups of steel h-piles driven through fill, soft alluvium and gravels into the underlying slaty mudstone. Preliminary pile driving and loading tests suggested that a working load of 1000 kn could be safely carried by each pile. However, redriving tests on selected working piles indicated a marked reduction in driving resistance. This deterioration was confirmed by loading tests which showed a reduction in carrying capacity between the first and second stages of loading. Further loading tests were made on working piles, and 'winged' piles consisting of short lengths of h and t-sections welded to the toe of the plain h-pile were tested to failure in compression. As a result of these tests it was decided to use plain piles at a reduced working load of 800 kn. Values of ultimate end bearing resistance of the slaty mudstone were indicated from the results of uplift tests to determine the skin friction on the piles in the overburden and mudstone. (a). This paper forms part of the second geotechnique symposium in print: "piles in weak rock". For the covering abstract of the symposium see IRRD abstract no. 220250. /TRRL/

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 95-104
  • Serial:
    • GEOTECHNIQUE
    • Volume: 26
    • Issue Number: 1
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00138923
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 26 1976 12:00AM