DEVELOPMENT OF INSITU EQUIPMENT FOR CAPACITY DEFORMATION OF DEEP FOUNDATIONS IN FLORIDA LIMESTONE. FINAL REPORT

The research focused on a technique that can be used to assess the maximum lateral (side) friction shear along the rock socket. A small scale anchor - cast using a fluid grout - is pulled in order to define the maximum side shear. The movement of the anchor can be monitored so that a T-Z curve can be obtained. Thirteen tests were performed at three sites using various new techniques to cast the plugs and measure their displacement. In addition, information was obtained from tests completed in the Miami Oolite rock formation. Nondestructive lab seismic tests were also performed on the rock cores. The main conclusions can be summarized as follows: The anchor length/diameter ratio may affect the computed maximum side shear, at least for the types of rocks investigated. Additional tests are required to verify this point. It appears that the initial portions of the T-Z curves found via pullout and load tests, agree. The displacement required to mobilize the maximum side shear ranged between 0.1 and 0.2 inches. These figures are similar to the ones found via full size load tests in a previous research. The obtained A (alpha) values fell either close to or above the lowest of the existing guidelines, thus indicating that this could be an appropriate starting point for preliminary design. The evidence tends to support the new predictive method proposed by McVay. The results indicate that a relationship exists between the P-wave speed and the unconfined compressive strength of the rock cores. The P-wave speed also appears to be related to the secant slope of the T-Z curves.

  • Corporate Authors:

    University of Florida, Gainesville

    Department of Civil Engineering, P.O. Box 116580
    Gainesville, FL  United States  32611-6580

    Florida Department of Transportation

    Haydon Burns Building, 605 Suwanee Street
    Tallahassee, FL  United States  32301

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Bloomquist, D
    • Townsend, F C
  • Publication Date: 1991-3

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 233 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00625202
  • Record Type: Publication
  • Report/Paper Numbers: FL/DOT/RMC/529/3288, UF Project 4910450428212, State Proj 99700-7506-119
  • Contract Numbers: C-3288
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 26 1993 12:00AM