关键词: 桩基础, 齿桩, 小改截面桩, 模型试验, 粗糙度, 剪切面, 竖向承载

Abstract: To explore the bearing characteristics and lateral resistance changes of the tooth pile under vertical load in the sand foundation, we designed several sets of model tests, in which the tooth length and the teeth number of the pile were selected as parameters, and the results of tooth pile were compared with that of smooth surface pile. The test results showed that the pile side resistance was positive linear correlated with tooth length when the teeth number was the same. Similarly, when the tooth length was the same, the pile side resistance was positive linear correlated with the teeth number. The teeth number had a great influence on the side resistance. However, the tooth length had great influence on the vertical bearing capacity. When teeth number increased, the upper load could be shared by the pile side friction, due to the roughness increase of the pile side and the modification of tooth effect to friction softening. The tooth structure of the tooth pile enhanced the vertical bearing capacity by enhancing the strength of the pile-soil interface, and changing the occurrence position and thickness of the shear zone in the interface. This research can enrich the study on small modified section piles and provide reference for the innovative of pile foundation.

Key words: pile foundation, tooth pile, small modified section piles, model test, roughness, shear zone, vertical load;