静压管桩桩-土作用机制及其竖向承载力确定方法  

Pile-Soil Interaction Mechanism and a Method to Determine Vertical Bearing Capacity of Prestressed Concrete Pipe Pile

作　　者：王常明[1] 常高奇[1] 吴谦[1] 李文涛[1] 

机构地区：[1]吉林大学建设工程学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2016年第3期805-813,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金面上项目(40972171)~~

摘　　要：为深入研究静压管桩桩土的作用机制及其竖向承载力的确定方法,以长春地区建筑工程使用的静压管桩为例,采用数值模拟方法和桩的载荷试验,分析了桩对桩周土的挤压作用以及桩端阻力变化规律。结果表明：桩被压入土体过程中,主要受到桩侧摩阻力和桩端阻力的作用,并造成桩周及桩端附近土体受到挤压而变形;随着桩入土深度的增加,桩顶荷载逐渐增大,而且桩径越大,相应深度的桩顶荷载就越大;同时,随着桩入土深度的增加,桩端阻力在单桩竖向承载力中的比例有规律地下降。根据桩端阻力在单桩承载力中所占比例与入土深度的关系,提出了静压管桩单桩承载力特征值的计算方法;对比建议公式和经验公式计算结果,其比值为0.57~1.26,两者结果接近。因此,文中所提出的单桩承载力特征值的确定方法是可行的。In order to research further on the pile-soil interaction mechanism and the methods to determine the vertical bearing capacity of prestressed concrete pipe pile,taken three projects of the prestressed concrete pipe pile in Changchun area as examples,the squeezing effect of pile to soil and the resistance of pile tip resistance are simulated numerically and tested by loading tests. It is shown that the side friction and the tip resistance are together produced to support the top load of pile in process of pile pressed into subsoil,and thus cause compressional deformation in the subsoil around the pile and near the end of pile. With increasing in depth,the top load of pile will increase gradually,and the bigger diameter of pile is the larger top load is. The proportion of tip resistance to pile bearing capacity tends to decline in regular with increasing depth of pile.According to the relationship between the proportion of pile tip resistance to single pile bearing capacity and the depth of pile,a new method to determine the bearing capacity of single pile is suggested in this paper. The method is feasible and applicable in Changchun area as the ratio of its calculation values to the results fromempirical formula is between 0. 57 and 1. 26.

关 键 词：静压管桩 数值模拟 单桩承载力特征值 

分 类 号：P642.22[天文地球—工程地质学]