Study of the Side Resistance of Bored Piles in Rock

The results of over 100 bored pile tests embedded in rock have been analyzed. A comparison with a large amount of published data on pile test results in construction sites from the USA, Canada, Hong Kong, Turkey, and other regions is presented. A pile strain index classification based on relative pile displacement was proposed. The ranges of mobilized side resistance of piles for different strain indexes were determined. The relationship between the side resistance of bored piles in rock and the unconfined compressive strength and strain values was obtained. The proposed relationship was compared with available published data and existing empirical methods.