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徐   腾¹ ,  徐晓东¹ ,  朱佩宁² ,  邓琴华² ,  陈伟杰¹ ,  苏楚源¹ ,  丁    亮¹

 

( 1. 广东电网有限责任公司 潮州供电局 , 潮州   521051 ;

2. 广东天信电力工程检测有限公司 , 广州   510663)

摘  要 :  为研究竖向荷载作用下斜桩的承载规律及自平衡法检测斜桩承载力的适用性 , 建立桩土有限元数值模型 , 模拟不同桩身倾角条件下堆载法和自平衡法的试桩过程 , 分析荷载-位移曲线 、桩身应力分布及地基变形特征 , 并计算自平衡转换系数 。结果表明 :  桩身倾斜会降低竖向承载力 , 倾角 8° 时堆载法极限承载力为6 553. 31 kN , 较竖直桩降低 5. 45% ;  自平衡法沿桩身轴向加载 ,  加载位置位于桩身平衡点处 ,  可充分发挥桩深层侧摩阻力和端阻力 , 等效转换后极限承载力为 7 622. 91 kN ,  较堆载法增大 16. 32% ;  自平衡法加载过程中桩体受力均匀 , 无弯曲变形和桩土脱空现象 , 对桩周土体扰动小 。因此 ,  自平衡法能更准确检测复杂工程条件下斜桩的竖向承载力 , 优于传统堆载法。

关键词 :  自平衡法 ;  斜桩 ;  Q-s 曲线 ; 堆载法 ; 竖向荷载

中图分类号 : TU473. 1           文献标志码 : A           文章编号 :  1005- 8249  (2026)  03-0109-07

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 018

 

XU Teng¹ , XU Xiaodong¹ , ZHU Peining² , DENG Qinhua² , CHEN Weijie¹ , SU Chuyuan¹ , DING Liang¹

( 1. Chaozhou Power Supply Bureau of Guangdong Power Grid Co. , Ltd. ,  Chaozhou 521051 , China;

2. Guangdong Tianxin Electric Power Engineering Testing Co. , Ltd. ,  Guangzhou 510663 , China)

Abstract :  To investigate the bearing behavior of inclined piles under vertical loads and the applicability of the O-cell method for detecting the bearing capacity of inclined piles , a finite element numerical model of the pile - soil system was established.  The loading processes of the surcharge method and the O-cell method were simulated under different pile inclination angles (0° , 4° ,8° , 12°) .  The load-displacement  curves ,  stress  distribution  along the pile , and deformation characteristics of the foundation were analyzed , and the conversion coefficient of the  O- cell  method was  calculated.  The results  indicate that  pile  inclination reduces the vertical bearing  capacity.  At  an  inclination  angle  of 8° , the ultimate  bearing  capacity  obtained by the  surcharge method is 6 553. 31 kN , which is 5. 45%  lower than that of the vertical pile.  The  O-cell method applies the load axially along the pile at the equilibrium point , which can fully mobilize the deep lateral friction and end resistance of the pile.  After equivalent conversion , the ultimate bearing capacity is 7 622. 91 kN , which is 16. 32%  higher than that obtained by the surcharge method. During the loading process of the O-cell method , the pile body is uniformly stressed without bending deformation or soil-pile separation , and the disturbance to the  surrounding  soil  is  small.   Therefore , the  O- cell  method  can  more  accurately  detect  the vertical bearing capacity of inclined piles under complex engineering conditions and is superior to the traditional surcharge method.

Key words :  o-cell method; inclined pile ; Q-scurve ; static surcharge method; vertical load