基于光纤传感技术静压桩承载力时效性机理分析

›› 2013, Vol. 34 ›› Issue (4): 1082-1088.

基于光纤传感技术静压桩承载力时效性机理分析

寇海磊，张明义，刘俊伟

青岛理工大学土木工程学院，山东青岛 266033

收稿日期:2012-06-06 出版日期:2013-04-10 发布日期:2013-04-16
作者简介:寇海磊，男，1984年生，博士研究生，主要从事土力学及桩基础领域的研究。
基金资助:
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）

Bearing capacity efficiency mechanism analysis of jacked pile based on optical fiber sensing technology

KOU Hai-lei, ZHANG Ming-yi, LIU Jun-wei

School of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China

Received:2012-06-06 Online:2013-04-10 Published:2013-04-16

摘要/Abstract

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

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.

Key words: bearing capacity efficiency, optical fiber sensor, interval re-pressed test, ultimate bearing capacity, increase model

中图分类号:

TU 473

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]. , 2013, 34(4): 1082-1088.

KOU Hai-lei, ZHANG Ming-yi, LIU Jun-wei. Bearing capacity efficiency mechanism analysis of jacked pile based on optical fiber sensing technology[J]. , 2013, 34(4): 1082-1088.

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