抗拔桩的承载性能研究  

Research on bearing capacity behavior of uplift pile

作　　者：王幼青[1] 张磊[2] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]吉林建筑工程学院职业技术学院,吉林长春130021

出　　处：《哈尔滨工业大学学报》2006年第3期389-391,共3页Journal of Harbin Institute of Technology

基　　金：黑龙江省博士后科研启动基金资助项目(LHK-04052)

摘　　要：针对抗拔桩的侧摩阻力很难准确计算的问题,采用弹性力学M ind lin解并结合非线性接触面单元建立了一个能考虑桩体泊松效应的桩土体系力学模型.通过对原型抗拔试验桩进行模拟验证了该模型的适用性.分析表明,抗拔桩属于“突进型破坏”,而抗压桩属于“缓进型破坏”.且在极限荷载作用下抗拔桩的变形较小,破坏前兆不易察觉.抗拔桩的桩侧阻力随桩长的增加近似按线性关系减少,随桩径的增加按非线性关系减少.A mechanical model of pile-soil system was established based on the Mindlin formula and nonlinear interface element. The poisson＇s ratio effect of pile shaft can be considered by this model. The suitability of the model was examined by simulation test of prototype uplift pile. It＇s concluded by the calculated Q - S curves that uplift pile gets into ＂brittle failure, and down-ward pile falls into ＂progressive failure＂. Failure deformation of uplift pile is comparatively smaller, and failure indications appear not clear. The side resistance of uplift pile decreases with the increase of pile length in linear function, and with the increase of pile diameter in nonlinear function.

关 键 词：抗拔桩 接触面单元 泊松效应 侧阻力 

分 类 号：TU473[建筑科学—结构工程]