珊瑚礁地层中PHC桩原位静载试验研究

doi:10.16285/j.rsm.2019.0149

岩土力学 ›› 2019, Vol. 40 ›› Issue (S1): 381-389.doi: 10.16285/j.rsm.2019.0149

珊瑚礁地层中PHC桩原位静载试验研究

秦伟^{1, 5}，戴国亮^{1, 5}，马李志²，裴铭海³，王磊^{1, 4}，朱光耀³，高博²

1. 东南大学土木工程学院，江苏南京 211189；2. 中交第四公路工程局有限公司，北京 100123；3. 中交公路规划设计院有限公司，北京 100088；4. 南京东大自平衡桩基检测有限公司，江苏南京210018；5. 东南大学混凝土及预应力混凝土结构教育重点实验室，江苏南京 211189

收稿日期:2019-01-08 出版日期:2019-08-01 发布日期:2019-08-17
通讯作者: 戴国亮，男，1975年生，博士，教授，博士生导师，主要从事桩基础，岩土工程方面的科研和教学工作。E-mail：daigl@seu.edu.cn E-mail:230149395@seu.edu.cn
作者简介:秦伟，男，1988年生，博士研究生，主要从事深水基础、大变形数值分析技术的研究。
基金资助:
国家自然科学基金项目（No.51678145，No.51878160）；2015年江苏省普通高校研究生科研创新计划项目（No.KYLX15_0091）；混凝土及预应力混凝土结构教育部重点实验室和中央高校基本科研业务费专项资金（2015年）。

In-situ static loading tests of prestressed high strength concrete (PHC) pile in coral strata

QIN Wei^{1, 5}, DAI Guo-liang^{1, 5}, MA Li-zhi², PEI Ming-hai³, WANG Lei^{1, 4}, ZHU Guang-yao³, GAO Bo²

1. School of Civil Engineering, Southeast University, Nanjing, Jiangsu 211189, China; 2. CCCC Fourth Highway Engineering Co., Ltd., Beijing 100123, China; 3. CCCC Highway Consultants Co., Ltd., Beijing 100088, China; 4. Nanjing Self-Balance Pile Foundation Testing Co., Ltd., Nanjing, Jiangsu 210018, China; 5. Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing, Jiangsu 211189, China

Received:2019-01-08 Online:2019-08-01 Published:2019-08-17
Supported by:
This work was supported of the National Natural Science Foundation of China(51678145, 51878160), the Fundamental Research Funds for the Central Universities and Colleges, Universities in Jiangsu Province Plans for Graduate Research and Innovation of 2015 (KYLX15_0091), and the Research Work is Also Supported Funded by the Key Laboratory of Concrete & Pre-stressed Concrete Structure of the Ministry of Education of PRC, the Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)(2015).

摘要/Abstract

摘要： 珊瑚地层是钙质砂和礁灰岩的统称。在珊瑚地层中开展预应力高强度混凝土管桩（PHC桩）的原位堆载测试，分析了桩?珊瑚地质的相互作用规律。采用光纤光栅传感技术采集加载过程中的试桩桩身应变，由计算获取桩身轴力，分析加载过程中珊瑚地层中PHC桩基础的承载特性。试验结果表明，（1）桩?土响应处于线弹性阶段；（2）桩的承载发挥状态与入土深度显著相关，且入土深度超过15倍桩径时桩端阻力发挥峰值；（3）桩的安装方式几乎不影响其在珊瑚地层中的承载性能，但贯入能量的大小则显著影响；（4）入土深度和贯入能量的大小，影响珊瑚地质的破碎程度，颗粒破碎显著影响珊瑚地质中桩的承载发挥特性。通过原位测试可知在珊瑚地质中在贯入深度在15倍桩径以内，入土深度与桩端阻力正相关，与桩侧摩阻力反相关。

关键词: 光纤光栅（FBG）传感技术, 珊瑚地层, 预应力高强度混凝土（PHC）桩, 静载试验

Abstract: Coral soil is mainly composed of calcareous sand and reef limestone. A series of in-situ static loading tests was conducted in the prestressed high strength concrete(PHC) piles located at the coral soil, which were used to clarify the interaction between PHC piles and coral soil while loading. Fiber bragg grating(FBG) sensing technology was applied to collect strain values along pile shaft during tests, and then pile axial forces were calculated. Base on the values of axial forces, the piles bearing capacities have been analyzed. Experimental resutls show that: (1) the responses of pile-soil are in the linear elastic stage during these tests; (2) the bearing performance of pile is significantly related with its penetration depth in the soil. When the penetration depth exceeds 15 times of the pile diameter, the resistance at the tip of the pile reaches its peak; (3) the installation style of the pile hardly affects its bearing capacity in coral soil, but it significantly affects the penetration energy; (4) the penetration depth and energy affects the degree of fragmentation of the coral soil, which constrains the bearing capacity of pile. Based on in-situ testing, it can be seen that in the coral soil, when the penetration depth is less than 15 times of the pile diameter, the penetration depth is positively correlated with the resistance at the tip of the pile, and is inversely related to the friction resistance at the side of pile .

Key words: fiber bragg grating(FBG) sensing technology, coral strata, prestressed high strength concrete(PHC) pile, static load tests

中图分类号:

TU 473

秦伟, 戴国亮, 马李志, 裴铭海, 王磊, 朱光耀, 高博, . 珊瑚礁地层中PHC桩原位静载试验研究[J]. 岩土力学, 2019, 40(S1): 381-389.

QIN Wei, DAI Guo-liang, MA Li-zhi, PEI Ming-hai, WANG Lei, ZHU Guang-yao, GAO Bo, . In-situ static loading tests of prestressed high strength concrete (PHC) pile in coral strata[J]. Rock and Soil Mechanics, 2019, 40(S1): 381-389.

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珊瑚礁地层中PHC桩原位静载试验研究

In-situ static loading tests of prestressed high strength concrete (PHC) pile in coral strata

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