摘要
现行斜桩承载力荷载试验未考虑水平、竖向荷载的相互影响,不符合斜桩的实际受力情况.为研究斜向荷载作用下斜桩承载性能,针对斜桩在轴向上的不对称性,采用有限元模拟斜向荷载作用下斜桩承载性能,分析了水平、竖向荷载对桩顶位移的相互影响,荷载大小与荷载倾角对桩顶位移的影响.结果表明:水平、竖向荷载对桩顶位移存在有利相互影响,同时施加可减小桩顶水平位移与沉降;在被研究的桩-土条件下,斜向荷载加载初期(不大于400 kN),斜桩轴向受荷时,桩顶水平位移、桩顶沉降同时最小;斜荷载加载中后期(大于400 kN),若斜桩倾角大于与荷载倾角1°~2°,斜桩桩顶水平位移最小且在6 mm内、桩顶沉降较轴向受荷时增加1.1 mm,水平承载力提高62.9%、竖向承载力略有降低.
The current load test of bearing capacity of inclined piles does not consider the interaction between horizontal and vertical loads,which is inconsistent with the actual stress situation of inclined piles.In order to study the bearing capacity of inclined pile under oblique load,aiming at the axial asymmetry of inclined pile,the bearing capacity of inclined pile under oblique load was simulated by finite element method.The mutual influence of horizontal and vertical loads on pile top displacement,and the influence of load size and load inclination angle on pile top displacement were analyzed.The results show that horizontal and vertical loads have beneficial mutual influence on the displacement of pile top,and the horizontal displacement and settlement of pile top can be reduced by applying them simultaneously.Under the studied pile-soil condition,the horizontal displacement and settlement of the top of the pile are minimum at the initial stage of oblique loading(not more than 400 kN)and when the inclined pile is axially loaded.In the middle and late period of oblique loading(greater than 400 kN),if the inclination angle of oblique pile is greater than 1~2 with load,the horizontal displacement of the top of oblique pile is the smallest and within 6 mm,and the settlement of the top of pile increases by 1.1 mm compared with that under axial loading.The horizontal bearing capacity increases by 62.9%,while the vertical bearing capacity decreases slightly.
作者
邱红胜
吴龙烽
付张龙
朱万鑫
黄伟洪
QIU Hongsheng;WU Longfeng;FU Zhanglong;ZHU Wanxin;HUANG Weihong(School of Transportation,Wuhan University of Technology,Wuhan 430063,China;Zhuhai Airport Construction Co.Ltd.,Zhuhai 590400,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2020年第5期794-797,802,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金项目资助(11672215)。
关键词
斜桩
斜向荷载
承载性能
数值分析
inclined pile
oblique load
carrying capacity
numerical analysis
