Construction Technique,Effect and Mechanism of Pressure-grouting for Increasing the Bearing Capacity of Bored-piles

Based on the in-situ pressure-grouting experiments and the full-scale pile quiescontly loaded tests of Wudou bridge, the process and effect of jet pressure-grouting are presented in this paper.The mechanism of increasing the performance of bored piles by grouting is also analyzed.And engineering experience of applying the new technique is presented in the paper.