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:
  Bearing Capacity Dynamic Loads Load Tests Pile Driving Piles (Supports) Soil Types Stresses
• 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.
  
  
• Format:
  PDF
• Funding:
  R27-122
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1c570b84621ebffee0a088eba99e7a795e7fb9302a71b79958d44c09e7f8c9a6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28801/dot_28801_DS1.pdf
• File Type:
  [PDF - 2.64 MB ]