基于FBG传感技术的静压沉桩贯入特性测试研究  被引量:4

Testing Study on Penetration Characteristics of Jacked Piles Based on FBG Sensing Technology

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作  者:王永洪[1,2] 马加骁 张明义 白晓宇[1,2] 苗德滋 桑松魁[1] WANG Yonghong;MA Jiaxiao;ZHANG Mingyi;BAI Xiaoyu;MIAO Dezi;SANG Songkui(School of Civil Engineering,Qingdao University of Technology Qingdao,266033,China;Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao,266033,China)

机构地区:[1]青岛理工大学土木工程学院,青岛266033 [2]山东省高等学校蓝色经济区工程建设与安全协同创新中心,青岛266033

出  处:《振动.测试与诊断》2021年第5期1014-1020,1040,共8页Journal of Vibration,Measurement & Diagnosis

基  金:国家自然科学基金资助项目(51778312,51708316);山东省重点研发计划资助项目(2017GSF20107,2018GSF117010);山东省自然科学基金资助项目(ZR2016EEP06)。

摘  要:由于静压沉桩贯入机理复杂,桩端形式不同是引起静压沉桩贯入特性不同的主要原因之一,故提出了一种应用光纤光栅(fiber Bragg grating,简称FBG)传感技术监测不同桩端形式静压沉桩贯入特性的新方法。将增敏微型光纤光栅传感器粘贴在开口桩内管外壁,外管外壁通过开槽预埋光纤光栅传感器,分别通过监测内管外壁和外管外壁的竖向变形来分析静压沉桩贯入特性。通过在桩顶和桩端分别安装双模式温度自补偿型光纤光栅土压力传感器和全截面动态轮辐压力传感器的对比分析,说明了该方法适用于开闭口桩静压沉桩测试,为光纤传感技术在岩土工程中的广泛应用提供了新思路。The penetration mechanism of jacked pile is complicated,and the different form of pile end is one of the main reasons for the different penetration characteristics of jacked pile. A new method using fiber Bragg grating(FBG)sensing technology to monitor the penetration characteristics of jacked piles is proposed. The method is to paste sensitized miniature fiber Bragg grating sensor on the outer wall of the inner tube of the open pile. The outer wall of the outer tube is embedded by slotted fiber Bragg grating sensor to analyze the penetration characteristics of the jacked pile by monitoring the vertical deformation of the outer wall of the inner tube and the outer wall of the outer tube respectively. Through the comparative analysis of installing the dual-mode self-compensation FBG earth pressure sensor and the full-section dynamic wheel spoke pressure sensor at the pile tip and pile end,the new method is suitable for the jacked pile test of open pile and closed pile,which provides a new idea for the wide application of fiber optic sensing technology in geotechnical engineering.

关 键 词:光纤传感技术 开闭口桩 静压沉桩 轮辐传感器 土压力传感器 

分 类 号:TH823[机械工程—仪器科学与技术] TH473[机械工程—精密仪器及机械]

 

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