Study on the Influence and Mechanism of the Tooth Layers Number on the Compressive Bearing Performance of Tooth Piles

In order to solve the pile bearing problem of poor foundation, a new type of tooth pile with small modified cross-section is proposed. Five types of tooth piles with different tooth spacing were designed, and numerical simulation study of tooth pile-soil interaction under layered foundation was carried out on an actual project by using ABAQUS, which revealed the influence law of tooth layers number on vertical bearing capacity of tooth piles, and analyzed the mechanism of the tooth structure on the soil around the piles. The results show that: Tooth piles can significantly increase the lateral resistance and reduce the pile top settlement compared with smooth piles. When the tooth spacing is equal to one times the pile diameter, the bearing capacity of tooth piles is the most economical. The increase in the tooth structure delays the softening of the lateral resistance, expands the influence range of the soil around the pile, effectively transfers the upper load to the soil around the pile, fully exerts the shear resistance of the soil around the pile, thereby increasing the bearing capacity of the tooth pile by increasing the lateral resistance. The innovative introduction roughness concept and the quantitative standard of roughness are proposed, which can lay the foundation for the subsequent development of theoretical calculations. The research results can provide a theoretical basis for the design and construction of tooth piles.