A SIMPLIFIED FIELD METHOD FOR CAPACITY EVALUATION OF DRIVEN PILES. FINAL REPORT

A simplified method based on energy balance between the total energy delivered to the pile and the work done by the pile/soil systems is proposed. This method, entitled the Energy Approach, assumes elastoplastic load displacement pile-soil relations. Calculated transferred energy and maximum pile displacement from the measured data, together with the field blow count, are used as input parameters. This method does not consider the propagation process and is aimed at providing a real-time pile-capacity prediction in the field. Two large data sets were gathered at the University of Massachusetts at Lowell. One, PD/LT, contains 208 dynamic measurement cases on 120 piles monitored during driving, followed by a static load test to failure. The data were obtained from various sources and reflect variable combinations of soil-pile-driving systems. The other, PD, contains data on 403 piles monitored during driving and was provided by Pile Dynamics Inc. of Cleveland, Ohio. All cases were examined and analyzed. The Energy Approach method was found to provide excellent evaluations of pile capacity under all conditions. The method is, therefore, proposed to be used in the field for instantaneous capacity determination. The predictions of this method were found on the average to provide more accurate evaluations than the sophisticated office methods, especially for records obtained at the end of initial driving. The Energy Approach is, therefore, also proposed to be used as an independent tool to evaluate the office methods.

  • Corporate Authors:

    University of Massachusetts, Amherst

    Department of Civil and Environmental Engineering
    130 Natural Resources Road
    Amherst, MA  United States  01003

    Federal Highway Administration

    Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
    McLean, VA  United States  22101
  • Authors:
    • Paikowsky, S G
    • Regan, J E
    • McDonnell, J J
  • Publication Date: 1994-9

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 313 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00668966
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-94-042, 3E3A-0922
  • Contract Numbers: DTFH61-92-C-00038
  • Files: TRIS, USDOT
  • Created Date: Nov 10 1994 12:00AM