Evaluation/modification of IDOT foundation piling design and construction policy.

Details

• Creators:
  Long, James H. ; Hendrix, Joshua ; Baratta, Alma.
• Corporate Creators:
  Illinois Center for Transportation
• Corporate Contributors:
  Illinois. Department of Transportation. Bureau of Materials and Physical Research
• Subject/TRT Terms:
  • Piles (Supports)
  • Pile foundations
  • Piling (Civil engineering)
  • Foundations
• Publication/ Report Number:
  FHWA-ICT-09-037 ; CT-09-037, UILU-ENG-2009-2008
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Edition:
  Jan. 2007-Mar. 2009
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  The Illinois Department of Transportation (IDOT) estimates pile lengths based on a static analysis method; ; however, the final length of the pile is determined with a dynamic formula based on the pile driving resistance ; exhibited in the field. Because different methods are used for estimating and for acceptance, there is usually a ; lack of agreement between the estimated length and the driven length of pile. The objective of this study is to ; assess the ability of the methods currently used by IDOT, to assess other methods for estimating pile capacity, ; to improve the methods if possible, and to determine resistance factors appropriate for the methods. ; This study reports pile load test data along with pile driving information and subsurface information, and ; uses this information to investigate and quantify the accuracy and precision with which five different static ; methods and five different dynamic formulae predict capacity. These static methods are the IDOT Static method, ; the Kinematic IDOT (K-IDOT) method, the Imperial College Pile (ICP) method, Olson’s method and Driven. The ; dynamic formulae are the EN-IDOT formula, the FHWA-Gates Formula, the Washington State Department of ; Transportation (WSDOT) formula, the FHWA-UI formula, and WEAP. Three databases were assembled and ; used to quantify the ability of these methods to predict capacity. ; Results suggest that the three dynamic formulae: WS-DOT, the FHWA-Gates, and the UI-Gates provide ; similar accuracy. However, the WS-DOT formula is simple to implement and predicts capacity most consistently ; for the databases reviewed in this study. A value of 0.55 is recommended for the resistance factor for redundant ; piling.
  More +
• Format:
  PDF
• Funding:
  ICT-R27-24
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16713/dot_16713_DS1.pdf
• File Type:
  [PDF - 2.93 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:0a9c10e4deb44ca8ab51e4a02a700fc44ea10581b1c231b01a832f7d94049d76