Use of High-Strain Dynamic Testing to Efficiently Design and Construct Bridge Foundations in Glacial Soils

The design of driven piles in glacial tills and outwash soils is frequently conservative in regards to pile length and foundation cost and ineffective in accurately characterizing the soil-pile interaction. Technology such as high-strain dynamic testing can be utilized to more efficiently and sustainably design and construct deep foundation systems. High-strain dynamic testing was utilized in a design-build project in the Minneapolis/St. Paul metropolitan area to characterize the properties of the soil-pile interaction and more economically construct the substructure foundations. At each substructure, initial drive and restrike tests were performed on 12 ¾-inch outside-diameter, steel, closed-ended pipe piles driven into glacial soils. The unit side resistances and unit end bearing resistances were determined from wave matching analyses using CAPWAP on restrike and/or initial drive data. The differences in the predicted and measured unit side resistance and unit end bearing resistance in glacial till and outwash soils for driven pile are discussed. For the seven structures currently completed, the actual driven pile lengths varied from 24.9 percent greater to 50.7 percent less than the expected lengths and the driven pile lengths were shortened on average by approximately 3.9 percent corresponding to an overall cost savings of approximately $98,000.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 284-293
  • Monograph Title: Geotechnical Frontiers 2017: Foundations

Subject/Index Terms

Filing Info

  • Accession Number: 01688011
  • Record Type: Publication
  • ISBN: 9780784480465
  • Files: TRIS, ASCE
  • Created Date: Oct 4 2018 4:01PM