悬空桩桩侧阻力的发挥特征简析  

Characteristics of Side Resistance for a Suspended Pile

作　　者：高鹏 王恒涛 刘智 王祖耀 罗元章 罗寒 GAO Peng;WANG Hengtao;LIU Zhi;WANG Zuyao;LUO Yuanzhang;LUO Han(China Jikan Research Institute of Engineering Investigation and Design Co.Ltd.,Xi'an 710043;New Energy Division,Datang Shaanxi Electricity Power Generation Co.Ltd.,Xi'an 710000)

机构地区：[1]机械工业勘察设计研究院有限公司,西安710043 [2]大唐陕西发电有限公司新能源分公司,西安710000

出　　处：《土工基础》2024年第2期261-264,共4页Soil Engineering and Foundation

基　　金：陕西省创新能力支撑计划项目(2023-CX-TD-34,2022-KJXX-05,2023-CX-PT-46);陕西省科技统筹创新工程项目(2016KTZDSF03-02);国机集团青年科技基金重点项目(2022-ZD-17,2022-PY-41);西安市英才计划青年项目(2022XAYC-03)。

摘　　要：桩侧阻力的测试是桩基内力测试中的重要环节,但其在测试过程中的精度往往受到桩端阻力的影响,想要得到相对准确的桩侧阻力,桩端阻力则应该无限趋近于零值。依托陕北某黄土地区混凝土灌注桩试桩检测项目,引入特殊桩型悬空桩与常规试桩进行对比试验,探究悬空桩侧阻力并分析其发挥特征。研究结果显示,悬空桩作为一种特殊桩型,可视为典型的摩擦桩,桩端阻力可以忽略不计,桩顶所施加荷载完全由桩侧阻力承担,桩的侧阻力随桩顶荷载的增加表现为单调递增的特征,且桩侧阻力增速(斜率)明显大于常规桩,试验结果可为相关工程项目提供参考。The testing of pile side resistance is an important part of testing the load distribution along piles,but its testing accu-racy is often affected by the tip resistance during the test procedure.To obtain the relative accuracy of the side resistance along piles,the tip resistance should be approached to zero.This article presents a case history of the axial load test of a cast-in-place reinforced concrete pile in the loess region of northern Shaanxi Province.A comparative study between the suspended pile and the conventional cast-in-place reinforced concrete pile are performed,and the side resistance of the suspended pile are analyzed.The results show that as a special pile type,the suspended pile can be considered as a typical friction pile,and the tip resistance could be ignored.The load applied to the pile top is completely resisted by the side resistance.The pile resistance shows a mon-otonic increase with the pile top load increasing.The growth rate(slope)of the pile side resistance is significantly higher than that of in the conventional piles.The testing results could provide a reference for the relevant engineering projects.

关 键 词：悬空桩 静载试验 桩侧阻力 桩端阻力 

分 类 号：TU473[建筑科学—结构工程]