DESIGN AND CONSTRUCTION OF DRILLED SHAFTS

In reply to the contention that the expense of a load test is not justified for owners of small projects, a method to ascertain whether or not a load test is justified is proposed. The drilled shaft foundation can be designed considering end-bearing only and considering both end-bearing and skid friction, employing as a guide the correlations between load transfer and soil properties that have been published. If computations indicate that the potential savings by counting on skin friction are more than the cost of the load test, the load test is justified if time allows. While using the effective stress method in developing correlations between load transfer relationships and soil properties is desirable, there are formidable difficulties because of problems associated with predicting soil strength parameters and effective stresses. With regard to the collapse of an underream, it is a good practice to drill a test excavation if collapse is expected. If collapse occurs, the underream can be replaced with an appropriate length of straight shaft.

  • Availability:
  • Supplemental Notes:
    • Closure of discussion on ASCE Paper 13503 (January 1978).
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Reese, L C
  • Publication Date: 1979-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00196153
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14599 Proceeding
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM