Effect of underreaming on bearing capacity of bored pile

Conclusions 1. From the data for the full-scale static tests of piles 6–22 m long, it was found that as the ratio /d increases, the load transmitted through a pile underreaming having the same size decreases proportionally.2. The limit strength at the foot of piles over 10 m long cannot be determined by means of analytical strengths depending only on the depth h and the liquidity index I_L but which do not depend on the ratio /d.Scientific-Research Institute of Bases and Underground Structures. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 6, pp. 12–14, November–December, 1986.