A COMPARISON OF THREE TYPES OF DRIVEN CAST IN SITU PILE IN CHALK

Case histories of three different types of driven cast in situ pile penetrating the same stratum of upper chalk are presented and their behaviour is compared. The piles were all driven in an area of reclaimed land to the north of Portsmouth Harbour, and were required to support a multi-storey building and bridges. The depths of overlying fill and recent deposits have been determined from boreholes adjacent to each pile. Standard penetration tests carried out in these boreholes have permitted the grading of the chalk to be assessed. Groundwater was encountered at very shallow depths. The three types of pile range from driven cast in situ, with and without enlarged bases, to driven segmental 'shell' type piles, and the results of respectively ten, four and six pile tests are described. Driving records are presented, together with driving criteria by which contract piles were deemed acceptable. The performance of the three types of pile are contrasted and compared with previously published records. Details of pile construction are considered and their influence on performance assessed. It is shown that the piles with enlarged bases perform consistently better because of the development of greater shaft friction in the chalk than in other piles of a similar length; deductions are made as to the reason for this.(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; Photos; References; Tables;
  • Pagination: p. 73-93
  • Serial:
    • GEOTECHNIQUE
    • Volume: 26
    • Issue Number: 1
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00138922
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 26 1976 12:00AM