| 水平低周往复位移下单桩-土相互作用试验研究 |
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| 引用本文： | 黄福云,陈汉伦,董锐,单玉麟.水平低周往复位移下单桩-土相互作用试验研究[J].岩土力学,2020,41(5):1625-1634. |
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| 作者姓名： | 黄福云 陈汉伦 董锐 单玉麟 |
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| 作者单位： | 1. 福州大学 土木工程学院 福建省工程结构重点实验室，福建 福州 350108；2. 福州市城乡建设发展有限公司，福建 福州 350007 |
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| 基金项目： | 国家自然科学基金项目（No. 51578161）；福建省新世纪优秀人才计划（No. 50011504）；福州市科技局项目（No. 2018-G-63） |
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| 摘 要： | 整体式桥台无伸缩缝桥梁（以下简称整体桥）桩基应设计为柔性桩，以保证较好的抗水平变形能力。但是，我国相关规范中判别柔性桩的算法主要应用于单向水平受荷桩，可否沿用至整体桥桩基还有待验证。为此，根据一种特殊设计的桩身变形测量方法，对3根埋深不同的混凝土模型桩进行了低周水平往复位移下的拟静力试验，研究单桩-土体系的抗震性能和相互作用机制。研究表明，水平往复位移下混凝土桩在埋深为3D～6D（D为桩径）范围内开裂；桩的埋深越大，桩身挠曲程度越大、变形特征点位置也越深、桩-土体系的抗弯刚度也越大、水平极限承载力也越高、抗震性能也越强。研究还表明，桩-土体系进入弹塑性阶段后，柔性桩的水平工作性状将逐渐向刚性桩退化。另外，在判别整体桥桩基的水平工作性状时，我国相关规范中的规定偏不安全。实际工程中，建议以Broms方法进行参考计算。
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| 关 键 词： | 柔性桩 横向刚度系数 深度系数 水平工作性状 水平往复位移 |
| 收稿时间： | 2019-04-21 |
| 修稿时间： | 2019-09-18 |
Experimental study of single pile-soil interaction under
horizontal low-cycle reciprocating displacement |
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| HUANG Fu-yun,CHEN Han-lun,DONG Rui,SHAN Yu-lin.Experimental study of single pile-soil interaction under
horizontal low-cycle reciprocating displacement[J].Rock and Soil Mechanics,2020,41(5):1625-1634. |
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| Authors: | HUANG Fu-yun CHEN Han-lun DONG Rui SHAN Yu-lin |
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| Institution: | 1. Fujian Key Laboratory of Engineering Structure, College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;
2. Fuzhou Urban and Rural Construction Development Co. Ltd, Fuzhou, Fujian 350007, China |
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| Abstract: | To ensure better horizontal deformation resistance, the pile foundation of integral abutment jointless bridges (IAJBs) should be designed as flexible pile. However, the calculation algorithm of flexible pile in relevant codes in China is mainly applied to the laterally loaded pile, and whether it can be used to identify the flexible pile for IAJBs remains a tricky issue to be studied. Therefore, in order to study the aseismic performance and interaction mechanism of the single pile-soil system, three concrete model piles with different lengths were tested under horizontal low-cycle reciprocating displacement based on a specially designed pile deformation measurement method. The result shows that the earliest cracking position of concrete pile is between 3~6 times of pile diameter. The deeper the pile is buried, the better the effect of pile-soil interaction with a deeper location of the deformation characteristic point. Meanwhile, stiffness of pile-soil system, horizontal ultimate bearing capacity and aseismic performance is improved with burial depth increased. The result also indicates that, when the pile-soil system reach the elastoplastic stage, the flexible performance of the pile will gradually degenerate from the elastic pile to the rigid pile. Furthermore, the provisions in relevant codes in China are not safe enough when evaluating the flexural performance of the pile foundation of integral abutment jointless bridges. Hence, it is recommended to use the Broms method for the benchmarking calculation in practical engineering. |
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| Keywords: | flexible pile transverse stiffness coefficient depth coefficient flexural performance horizontal reciprocating displacement |
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