DYNAMIC PILE DRIVING MEASUREMENT FOR UNIVERSITY OF HOUSTION PILE GROUP STUDY

Dynamic measurements of strain and acceleration were made during pile driving operations on 11 piles using transducers attached near the top of the pile. The objective of the program was to collect pile driving data that could be utilized to assess hammer-pile-soil performance and interaction. Vertical load tests were conducted on a separate program on both a 9-pile group and two single piles as part of the overall FHWA research effort. All piles were vertical, closed-ended, steel pipe piles with an O.D. of 10.75 in. (27.31 cm) and a wall thickness of .365 in. (9.27 mm). A Raymond 1S single-acting steam hammer with maximum rated energy of 19,500 ft-lbs (26,448 N-m) was used. The general soil conditions at the site were characteristically stiff to hard clays. The following major conclusions were drawn: (1) Blow count generally increased in a linear fashion with increasing tip penetration. (2) The data indicated that hammer performance improved during the course of the driving program. (3) Measured maximum compressive stresses at the tranducer level ranged from approximately 12 to 27 ksi (8.2 x 10 to the seventh power to 18.5 x 10 to the seventh power Pa). (4) PIle retap data revealed that the significant increase in static ultimate bearing capacity occurred during time delays. (5) Pile group driving effects were apparent during the retap of Pile. 2. Results of vertical load tests are presented in Reports FHWA/RD-81/001 through FHWA/RD-81/008. (FHWA)

  • Corporate Authors:

    Woodward-Clyde Consultants

    7330 Westview Drive
    Houston, TX  United States  77055

    Federal Highway Administration

    Engineering Research and Development Bureau, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Dover, A R
    • Locke, G E
    • Audibert, JME
  • Publication Date: 1981-3

Media Info

  • Pagination: 44 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341489
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-81- 9 Final Rpt., FCP 34H2-012
  • Contract Numbers: DOT-FH-11-9526
  • Files: TRIS, USDOT
  • Created Date: Dec 22 1981 12:00AM