等截面抗拔桩承载变形特性离心模型试验及数值模拟  

Centrifugal model tests and numerical simulation on bearing capacity and deformation of uplift piles with uniform sections

作　　者：李伟伟[1,2] 钱建固[1,2] 黄茂松[1,2] 吕玺琳[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2010年第S2期17-20,共4页Chinese Journal of Geotechnical Engineering

基　　金：上海市科委重大项目(07dz12006)

摘　　要：抗拔桩的承载变形问题正受到越来越多的重视。对抗拔单桩的承载变形特性进行了离心试验研究和数值模拟研究。通过做离心模型试验,分析抗拔桩在竖向上拔荷载作用下的Q–s曲线、桩身轴力曲线,然后通过建立桩土接触模型,进行数值模拟,将结果与离心试验结果进行对比。通过上述两方面工作,可以看到抗拔单桩承载变形特性呈现如下性状,抗拔力在起始阶段随上拔位移呈线性增长,随着上拔位移进一步增大,抗拔力出现非线性增长的特性,然后突然出现拐点,上拔位移迅速增大,抗拔力达到极限,抗拔桩破坏。Determination of the ultimate bearing capacity and deformation of an uplift pile has been paid more and more attention to.The centrifuge tests and numerical simulations are performed to analyze the characteristics of the ultimate bearing capacity and deformation of uplift single piles.The curves of Q-s and axial force of the shaft under uplift loads are analyzed by the centrifuge tests,and then with the establishment of pile-soil contact model,numerical simulations are performed and the results are compared with those of the centrifuge tests.Thus the characteristics of the ultimate bearing capacity and deformation of uplift single pile are that at in the initial stage the uplift load increases linearly along with the uplift displacement,and then nonlinearly as the uplift displacement increases further,finally inflexion appeares suddenly,the uplift displacement increases rapidly and the uplift load reach the ultimate value,the uplift pile is damaged.

关 键 词：抗拔桩 承载力 变形 离心模型试验 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]