LOAD TESTS ON PIPE PILES FOR DEVELOPMENT OF CPT-BASED DESIGN METHOD

This research focused on the drivability and load-carrying capacity of both open and closed-ended steel pipe piles. Two pipe piles (one open-ended, the other closed-ended) were installed in a sandy soil to the same depth. The site was extensively characterized. Standard penetration tests (SPTs) and cone penetration tests (CPTs) were performed both before and after pile installation. A variety of soil indices and shear strength parameters (such as the constant-volume friction angle) were measured in the laboratory. The piles were fully instrumented, permitting separate measurement of shaft and base capacity for the closed-ended pile and shaft, annulus and soil plug capacities for the open-ended pile. The results are presented in a variety of ways. In particular, values of pile resistance are presented normalized with respect to CPT cone resistance values both along the shaft and base of the piles for quick reference. The test results for the open-ended piles are quite unique. Two design methods are proposed for open-ended piles based on the field load test as well as on results found in the literature. In one method, pile resistances are referred to either the soil plug length or incremental filling ratio. In the other method, pile resistances are correlated to the CPT cone resistance. Comparisons of the proposed methods with the load test results and with methods currently in use are quite favorable. The present research suggests current pile design methods may be excessively conservative. It seems that cost savings from similar research, where complete measurement of all variables of interest both for the piles and for the soil deposit where the piles are installed are done, can be very substantial if the methods proposed here are validated further. It appears that such savings would be in the interest of state departments of transportation and the Federal Highway Administration.

  • Record URL:
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284

    Indiana Department of Transportation

    100 N Senate Avenue
    Indianapolis, IN  United States  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Kim, Karl
    • Salgado, R
    • Lee, Jong Jae
    • Paik, K
  • Publication Date: 2002-11

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 221 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00960070
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IN/JTRP-2002/4,, Final Report
  • Contract Numbers: SPR-2361
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jul 11 2003 12:00AM