带肋竹节桩竖向抗压承载力影响因素分析

Analysis of effected factors for vertical compressive bearing capacity of ribbed bamboo joint pile

带肋竹节桩作为一种新型桩基,其竖向承载能力较普通管桩高,关于其承载特性的理论研究较少。基于现场实测对比试验分析,采用ABAQUS有限元计算对带肋竹节桩的承载特性进行研究,分析带肋竹节桩抗压承载力与竹节数、桩土模量比、肋径比、摩擦系数等参数的关系。研究表明,相对于普通预应力管桩,带肋竹节桩竖向抗压承载力的增大存在最优竹节数;带肋预应力竹节桩极限承载力随桩土模量比的增大而减小,最后趋于定值;随肋径比的增大,其极限承载力先增大后减小;随摩擦系数的增大,其极限承载力与承载力增强系数呈线性增大。在计算分析的基础上给出带肋竹节桩承载力影响因素,为相关工程设计提供一定的参考。

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.