关键词: 带肋竹节桩, 增强系数, 桩土模量比, 承载特性, 有限元

Abstract: Prestressed pipe piles with ribs are new type of pile foundations; and they have better vertical bearing capacity than ordinary pipe pile. But there are few theoretical researches on their bearing characteristics. Based on field measurement comparative test analysis, the bearing characteristics of ribbed bamboo joint piles are studied by ABAQUS finite element method. The relationship between the vertical compressive bearing capacity of ribbed bamboo joint pile and the parameters such as modulus ratio of pile to soil, the ratio of rib to diameter and the friction coefficient are analyzed. The analysis results show that, the vertical compressive bearing capacity increase of ribbed bamboo joint pile is corresponding to the number of ribs. As the pile-soil modulus ratio increasing, the ultimate bearing capacity of composite pile with rib decreased. With the increase of rib diameter ratio, the ultimate bearing capacity firstly increases and then decreases. As the friction coefficient increasing, the ultimate bearing capacity and bearing capacity enhancement coefficient increase linearly. Based on the calculation and analysis, the effected factors are analyzed, so as to provide theoretical basis for the relevant engineering design.

Key words: ribbed bamboo joint pile, enhancement factor, pile-soil modulus ratio, bearing characteristics, finite elements