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COMPARISON OF PILE CAPACITY ESTIMATED BY SIGNAL MATCHING (CAPWAP®), ICAP® AND CASE METHOD OF DRIVEN STEEL PILES INSTALLED AT AN INDUSTRIAL SITE NEAR EDMONTON, ALBERTA
Session: Foundations II / Fondations II
Renato Clementino, Thurber Engineering Ltd. (Canada)
Robin Tweedie, Thurber Engineering Ltd. (Canada)
Yonggeng Ye, Thurber Engineering Ltd. (Canada)
The standard approach used to estimate the pile capacity from high-strain dynamic testing (HSDT) is by signal matching technique using commercial software programs such as CAPWAP®. This approach is relatively time consuming and requires an experienced person to properly interpret the results. A faster approach is the use of the Case Method, which is a closed form solution, but requires a selection of a damping constant, not always adequately known for the subject site. A new alternative is the iCAP® method, which is an automated signal matching procedure that provides a fast signal matching solution to estimate the pile capacity for uniform driven piles under simple pile-soil interaction conditions. As part of the quality control for driven steel pile installation at an industrial plant site near Edmonton, Alberta, 187 driven steel pipe piles were dynamically tested on pile sizes ranging from 254 mm to 762 mm and depths ranging from 10 m to 24 m. The HSDT were performed at the End of Drive and at the Beginning of Restrike. This paper provides a comparison of the estimated pile capacities from the 187 piles using CAPWAP® software, the automated signal matching iCAP® program and also with the Case Method.
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