Details:

Creators:
Long, James H. ; Hendrix, Joshua ; Baratta, Alma.
Long, James H. ; Hendrix, Joshua ; Baratta, Alma. Less -
Corporate Creators:
Illinois Center for Transportation
Corporate Contributors:
Illinois. Dept. of Transportation. Bureau of Materials and Physical Research
Subject/TRT Terms:
[+]
Foundations
Piling (Civil Engineering)
Pile Foundations
Piles (Supports)

Publication/ Report Number:
FHWA-ICT-09-037 ; CT-09-037, UILU-ENG-2009-2008
FHWA-ICT-09-037 ; CT-09-037, UILU-ENG-2009-2008 Less -
Resource Type:
Tech Report
Geographical Coverage:
Illinois
ISSN:
0197-9191
Edition:
Jan. 2007-Mar. 2009
Corporate Publisher:
Illinois Center for Transportation
NTL Classification:
NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ;
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.


Format:
PDF
Funding:
ICT-R27-24
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:0a9c10e4deb44ca8ab51e4a02a700fc44ea10581b1c231b01a832f7d94049d76
File Type:

Supporting Files

• No Additional Files

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