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Abstract Based on the database of 120 piles tests，for the calculations of bearing capacity of the deep piles (the socket depth greater than 5 times pile diameter) used in large highway bridges and culverts，considering the form and ideas in the specification[1]，the factors of frictional resistance and base resistance related to the corresponding unconfined compression strength are analyzed for different ranges of unconfined compression strength and introduced in the formula. To verify the calculation formula，ultimate bearing capacity of tested piles of four projects，including Xihoumen Highway Bridge，Qingdao Bay Bridge，Jinyue Yangtze River Highway Bridge，and Balinhe River Highway Bridge，are checked. The results showed that calculated and measured values are in good agreement，to meet the engineering design requirements.
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Received: 20 May 2011
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2011, Vol. 30 
