Abstract
In Wyoming, pile foundations for bridges are often driven on rock materials because of the state’s shallow bedrock stratigraphy. Unfortunately, no static analysis methods are currently available for estimating the resistance of these driven piles. In this paper, two recently completed bridge projects (the Owl Creek and Woods Wardell sites) on steel H-piles in Wyoming are explicitly presented, and data from three past projects are included to highlight the limited knowledge and challenges pertaining to the present design and construction practices. Static analysis methods were used to estimate the geotechnical resistances of these piles. The wave equation analysis program and the case pile wave analysis program were used to verify their performances during construction. Structural capacities of these piles were also calculated. The results of the studies show that the static analysis methods and structural analyses yield inconsistent pile resistance estimations. Recommendations in terms of pile bracing and embedded pile length are proposed to predict better the resistances of piles on soft rock.
Highlights
The shallow bedrock stratigraphy in Wyoming, USA results in steel H-piles with a high driving durability on rock often being used as the foundation system to support bridges in the state
This could lead to the underestimation of pile resistance by case pile wave analysis program (Capwap)
Motivated by the challenges faced by Wyoming Department of Transportation (WYDOT) on steel H-piles driven on rock and intermediate geomaterials (IGMs), detailed pile analyses of two case studies along with three case studies conducted by Ng et al (2015) were used to illustrate the limitations of current pile design and construction control procedures
Summary
The shallow bedrock stratigraphy in Wyoming, USA results in steel H-piles with a high driving durability on rock often being used as the foundation system to support bridges in the state. For a moderate structure load of a typical bridge in Wyoming, the driven steel pile system is more cost-effective than the drilled shaft foundation system. There are currently no pragmatic static analysis methods available for estimating the side resistance and end bearing of a driven pile on rock. To satisfy the LRFD strength limit state (gQ £ fR) requirement, the factored axial resistance of each pile (fR) at the abutment shall be greater than the specified factored load (gQ) of 694 kN (156 kips). To satisfy the LRFD strength limit state requirement, the factored resistance of each pile at the pier shall be Project
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