基于FLAC3D的楔形桩荷载传递机理数值分析研究  

FLAC3D Numerical Analysis of Load Transfer Mechanism of Tapered Pile

作　　者：邹长春 何杰[1] 吴政 刘孟鑫 ZOU Changchun;HE Jie;WU Zheng;LIU Mengxin(Civil Engineering College,Hunan University of Technology,Zhuzhou 412007)

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《土工基础》2022年第5期739-742,759,共5页Soil Engineering and Foundation

基　　金：湖南省自然科学基金资助项目(2020JJ6007)。

摘　　要：基于FLAC3D有限差分软件,建立了楔形桩桩土受力分析模型,对比分析了楔形桩与等截面桩承载性能的差异,探讨了楔角对楔形桩桩土荷载传递规律的影响。结果表明:楔形桩桩身轴力沿深度递减速率较等截面桩要快,且随楔角的增大而迅速增加,倾斜侧壁外形改变了桩体荷载传递规律;楔形桩桩侧荷载分担占比高达89.3%,外荷载主要由桩土界面摩阻力承担;相同桩顶沉降下,楔形桩桩周表土下拽位移要明显大于等截面桩,且楔角越大,位移越大,这种特殊的桩土相互作用机制是楔形桩优良承载性能的主要来源。To further study the load transfer mechanism of the tapered pile,the pile-soil stress analysis model of tapered pile is established by using FLAC3 D finite-difference software.The differences of load carrying characteristics between the tapered pile and the uniform-section pile are compared and analyzed.The influence of the taper angle on the load transfer mechanism of tapered pile between pile and soil is emphatically discussed.The results show that:the decreasing rate of axial force along the depth increases rapidly with the increase of the tapered angle;the shape of the inclined side wall changes the load transfer mechanism of the pile shaft.The proportion of the side load sharing of the tapered pile is as high as 89.3%,and the external load is mainly carried by the friction resistance of pile-soil interface;Under the same settlement of pile top,the pull-down displacement of the surface soil around the tapered pile is significantly greater than that of the uniform-section pile,and the larger the taper angle is,the higher the displacement will be.This special pile-soil interaction mechanism is the main source of the excellent load carrying capacity of the tapered pile.

关 键 词：楔形桩 数值分析 荷载传递规律 荷载分担占比 桩土作用机制 

分 类 号：TU473[建筑科学—结构工程]