Improved design for driven piles based on a pile load test program in Illinois : phase 2.

Details

• Creators:
  Long, James ; Anderson, Andrew
• Corporate Creators:
  University of Illinois at Urbana-Champaign. Dept. of Civil and Environmental Engineering
• Corporate Contributors:
  Illinois. Dept. of Transportation. Bureau of Materials and Physical Research ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Pile driving
  • Piles (Supports)
  • Dynamic loads
  • Load tests
  • Bearing capacity
  • Stresses
  • Soil types
• Publication/ Report Number:
  FHWA-ICT-14-019 ; ICT-14-021 ; UILU-2014-2023
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  A dynamic load test program consisting of 38 sites and 111 piles with restrikes was conducted throughout Illinois ; to improve the Illinois Department of Transportation design of driven piling. Pile types included steel H-piles and ; closed-ended pipe (shell) piles. Piles were driven into all soil types including clay, silt, sand, shale, and limestone. ; Predictive methods for estimating pile capacity were investigated and include the K-IDOT (static) method, ; WSDOT (dynamic formula), WEAP, PDA, and CAPWAP. Pile capacities were taken as the capacity estimated ; using CAPWAP for beginning of restrike conditions. ; Piles were monitored during initial driving. Piles were re-driven several days later to assess the amount of setup ; to assess the effect of time, pile type and soil type. Restrikes were conducted typically between 3 -15 days after ; initial driving. Modifying WSDOT to include effects of setup explicitly with specific equations (Skov and Denver, ; 1988) for time dependent setup was not any more precise than the original WSDOT formula with adjustments for ; pile type. Accordingly recommendations are made for adjusting WSDOT estimates based on whether the pile is ; an H-pile or a shell pile. ; Adjustments were made to the simplified stress formula (SSF) to refine predictions of stresses in driven H- and ; Shell piles driven with diesel hammers. ; Resistance factors were determined using the First Order Second Moment method for the static method (K-IDOT) and the dynamic formula (WSDOT). Pile types included H-piles and shell piles for both end of driving ; conditions and for beginning of restrike. Resistance factors were also determined for WEAP and PDA. These ; resistance factors were determined using the CAPWAP (BOR) capacity as the static capacity for the pile, ; although it is preferable that the resistance factors be based on static load test. Accordingly, adjustments were ; made to the resistance factors accounting for the average agreement between capacity determined by ; CAPWAP(BOR) and capacity determined with a static load test.
  More +
• Format:
  PDF
• Funding:
  R27-122
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28801/dot_28801_DS1.pdf
• File Type:
  [PDF - 2.64 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1c570b84621ebffee0a088eba99e7a795e7fb9302a71b79958d44c09e7f8c9a6