Abstract: To investigate the pull-out load-bearing characteristics of multi-tooth pile, we conducted scale model test of the tooth structure with varied number of tooth layer and tooth length. Our findings reveal that multi-tooth structure exhibits superior pull-out performance compared with smooth pile. Tooth pitch and tooth length are positively correlated with the pull-out bearing capacity of the model pile. At a certain elastic load-bearing stage, the pull-out bearing capacity of the model pile grows linearly with the increase of the number of teeth. Tooth length has a greater influence on the pull-out bearing capacity and the uplift side frictional resistance of the model pile than the number of teeth. The findings offer reference for the research and application of piles with small modified section.

Key words: pile foundation, multi-tooth pile, pullout resistance, model test, pile with small section