Abstract
In estimating the bearing capacity of the friction pile, it is important to improve the reliability of the bearing capacity formula. The uncertainty in bearing capacity of piles exists in estimation of both parameters on bearing capacity coefficients and soil properties. To increase the reliability of bearing capacity of piles, knowlegdes obtained from in-situ vertical loading tests of piles must be applied to prediction of actual piles. Besides, it is necessary to know the spatial variation of soil properties used for estimating the pile capacity on the basis of field investigation. In the present paper, by directing an attention to the bearing capacity of cast-in-place concrete piles, the authors present a method for evaluating the reliability of bearing capacity of viaducts founded on friction piles with consideration of the results from vertical loading tests and the spatial variation of soil properties.
