砂土中斜桩单桩水平承载与变形特性数值分析  

Numerical analysis of horizontal bearing capacity and deflection behaviors of single batter pile in sand

作　　者：赵爽[1,2] 吴君涛 张日红 陈克伟 王奎华 ZHAO Shuang;WU Juntao;ZHANG Rihong;CHEN Kewei;WANG Kuihua(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou 310058,China;ZCONE High-tech Pile Industry Holdings Co.Ltd.,Ningbo 315000,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [3]宁波中淳高科股份有限公司,浙江宁波315000

出　　处：《中南大学学报（自然科学版）》2022年第2期579-588,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52178358);中央高校基本科研业务费专项资金资助项目(2020QNA4027)。

摘　　要：为了研究砂土中各方向水平荷载作用下斜桩单桩的变形及承载特性,基于数值模拟探究正、负斜桩在水平荷载作用下桩周土的位移区范围、桩-土接触应力及桩身位移、剪力和弯矩分布,并进一步分析水平斜交荷载作用下斜桩单桩的承载力,给出不同倾斜角度、斜交角度时斜桩水平承载比预测经验公式。研究结果表明:在相同水平荷载作用下,负斜桩的桩周土塑性区范围最大,竖直桩次之,正斜桩最小;负斜桩的位移发展区沿桩身深度范围和竖直桩的基本一致,而反弯区沿桩身深度范围比竖直桩的小,正斜桩的位移发展区沿桩身深度范围比竖直桩的大,反弯区沿桩身深度范围和竖直桩的相当;由于优良的桩-土荷载传递性能,负斜桩桩身弯矩和剪力显著比竖直桩的小,正斜桩的桩身弯矩和剪力整体上最大;对于水平斜交荷载,随着加载角度增加,斜桩水平承载力呈指数函数形式上升。In order to study the bearing capacity and deflection behaviors of single batter pile under horizontal load in sand,the displacement field of the surrounding soil,pile-soil contact stress,displacement,shear force and bending moment distribution of positive and negative batter pile under horizontal load were explored through numerical simulation.Further,the bearing capacity of single batter pile under horizontal oblique load was analyzed.And the empirical formula for predicting the horizontal bearing ratio of batter pile with different batter angle and horizontal loading angle was provided.The results show that under the same horizontal load,the plastic zone of the soil around the negative batter pile is the largest,followed by vertical pile and positive batter pile.The depth range of main displacement zone along the pile shaft of negative batter pile is nearly the same as that of the vertical pile,while the depth range of the reverse bending area along the pile shaft is smaller than that of the vertical pile.The depth range of the main displacement zone along the pile shaft of the positive batter pile is larger than that of the vertical pile,and the depth range of the reverse bending area along the pile shaft is similar to that of the vertical pile.Due to the excellent pile-soil load transfer behaviors,the bending moment and shear force of the negative batter pile are significantly smaller than those of the vertical pile,and the bending moment and shear force of the positive batter pile are the largest.With the increase of horizontal loading angle δ,the horizontal bearing capacity of batter pile increases exponentially.

关 键 词：斜桩 三维数值分析 水平承载力 水平斜交荷载 

分 类 号：U416.1[交通运输工程—道路与铁道工程]