| 基于光纤传感技术静压桩承载力时效性机理分析 |
| |
| 引用本文： | 寇海磊,张明义,刘俊伟.基于光纤传感技术静压桩承载力时效性机理分析[J].岩土力学,2013,34(4):1082-1088. |
| |
| 作者姓名： | 寇海磊 张明义 刘俊伟 |
| |
| 作者单位： | 青岛理工大学 土木工程学院，山东 青岛 266033 |
| |
| 基金项目： | 国家自然科学基金资助（No. 51078196）；教育部高等学校博士点基金资助（No. 20093721110002） |
| |
| 摘 要： | 在桩身预埋FBG（fiber bragg gating）光纤传感器，利用静压桩隔时复压试验的优势，观测开口PHC管桩的承载力、桩端阻力以及桩侧摩阻力随休止时间的变化情况。试验表明，桩极限承载力在沉桩结束一定时间范围内随时间大致呈对数型增长，沉桩284 h后提高幅度达140%，时效性系数为0.52；桩端阻力和桩侧摩阻力在休止期内的提高幅度分别为6.28%和475.37%，说明试验场地条件下试桩承载力的提高主要源于桩侧摩阻力。试验结果显示，桩极限承载力及桩侧摩阻力的发展符合3阶段增长模型，时间界点分别为21.5 h和279 h。研究成果可为基桩时效性研究及相关设计提供依据。
|
| 关 键 词： | 承载力时效性 光纤传感器 隔时复压 广义极限承载力 增长模型 |
| 收稿时间： | 2012-06-06 |
Bearing capacity efficiency mechanism analysis of jacked pile based on optical fiber sensing technology |
| |
| KOU Hai-lei,ZHANG Ming-yi,LIU Jun-wei.Bearing capacity efficiency mechanism analysis of jacked pile based on optical fiber sensing technology[J].Rock and Soil Mechanics,2013,34(4):1082-1088. |
| |
| Authors: | KOU Hai-lei ZHANG Ming-yi LIU Jun-wei |
| |
| Institution: | School of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China |
| |
| Abstract: | The pile bearing capacity, base resistance and shaft resistance development of open PHC pipe pile can be confirmed through the interval re-pressed test of jacked pile with FBG sensors. It is indicated that the ultimate-bearing capacity shows logarithmic growth with elapsed time in the certain time after installation; and the magnitude is 140% after 284 hours with timeliness coefficient of 0.52. The increase magnitude of base resistance and shaft resistance is respectively 6.28% and 475.37% with time, which indicates that ultimate bearing capacity growth derives from shaft resistance in the test condition. The results show that the development of pile ultimate bearing capacity and shaft resistance accord with three-phase increase model and the time points are respectively 21.5 hours and 279 hours. respectively. The research results can provide evidence for timeliness coefficient and relevant design. |
| |
| Keywords: | bearing capacity efficiency optical fiber sensor interval re-pressed test ultimate bearing capacity increase model |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
