等截面抗拔桩的极限承载力计算综述  

A Review of Computation of Ultimate Bearing-capacity of Uplift Piles with Uniform Cross-section

作　　者：何泓男 戴国亮[1,2] 龚维明[1,2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《公路交通科技》2014年第6期63-69,132,共8页Journal of Highway and Transportation Research and Development

基　　金：国家重点基础研究发展计划(九七三计划)资助项目(2013CB036304);交通运输部课题(2013319759060)

摘　　要：为更好地应用抗拔桩,以其极限承载力的计算方法为研究对象,分析承载力计算值与实测值差异较大的问题,基于变形破坏面形式对抗拔桩极限承载力计算方法进行分析,并结合现场试验,对各种方法计算结果进行了对比研究。结果表明:标准模型,Meyerhof模型和Das模型均忽略桩的自重,计算值偏小,适用于长径比不大的抗拔桩;Chattopadhyay模型计算方法可行,但过程较复杂,适合砂性土层,Shanker模型考虑桩入土深度与桩径比值的关系,当比值大于20时计算具有一定的适用性;倒圆锥台考虑了桩的自重,Kotter模型基于Kotter方程计算,水平条分法假设破坏面为曲面,并根据极限平衡理论计算承载力,其计算值均与Vesic测试试验结果比较接近,且适用于各种土层条件下承载力的计算,均可作为计算等截面抗拔桩极限承载力的方法。In order to develop the application of uplift piles better, the calculation method of its ultimate bearing capacity is analyzed to study the great difference between calculation value and test value of bearing capacity. The calculation methods of ultimate capacity of uplift piles are analyzed based on the form of deformation and failure surface, and the comparative analysis on different calculation results is performed combining with field test. The results show that （ 1 ） standard model, Meyerhof model and Das model ignore the self-weight of pile, making the calculation value smaller than the test value, which can be applied to the uplift piles with small length-diameter ratio; （2） Chattopadhyay model can predict the bearing capacity of sandy soil, but the process is complicated; （3） Shanker model considers the value of embedded depth- diameter ratio, and can be used to predict the bearing capacity when the ratio is larger than 20; （4） inverted cone considers the self-weight of piles, Kotter model is based on Kotter equation, and horizontal slice method assumes the failure surface is curved, which calculates the bearing capacity based on ultimate equilibrium theory, the calculation results of the 3 models are close to Vesic test result, and they can all be used to compute the ultimate capacity of uplift piles with uniform cross section under different soil conditions.

关 键 词：桥梁工程 抗拔桩 极限承载力 变形破坏面 等截面 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]