增敏微型FBG应变传感器在预制桩模型实验中的应用  

Application of Enhancement Micro FBG Strain Sensor in Model Experiment of Static Pressure Precast Pile

作　　者：王永洪[1,2] 张明义[1,2] 张春巍[1,2] 白晓宇 Wang Yonghong;Zhang Mingy;Zhang Chunwei;Bai Xiaoyu(School of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China;Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qinodao Technological Universitu. Oingdao. Shandong 266033. China)

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

出　　处：《激光与光电子学进展》2018年第5期93-98,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51778312);山东省重点研发计划(2017GSF16107);山东省自然科学基金项目(ZR2016EEP06)

摘　　要：在静压预制桩沉桩过程中,采用一种增敏微型光纤布拉格光栅(FBG)应变传感器测试桩身的受力情况。利用在模型桩桩身表面开槽埋设FBG传感器的方式,通过压桩贯入模型实验,实时测试了模型桩桩身在贯入过程中的受力状态,分析了桩身轴力和桩侧摩阻力随贯入深度变化的规律。实验结果表明:该传感器预埋到模型桩桩身表面能很好地与桩体结合,可以精确测试模型桩桩身的受力变化,并且在模型实验中预制成功率高、安装灵活。A kind of enhancement micro fiber Bragg grating （FBG） strain sensor is used to test static pressure precast pile force during precast pile driving. We make a groove on the surface of the model pile body to bury FBG strain sensor, use static pressure precast pile penetration model experiment to test stress states in real time, and analysis profiles of axial force of pile shaft and side friction of pile with embedded depth. Experiment results show that the enhancement micro FBG strain sensor can be embedded well with model pile and can test stress states of model pile exactly. In addition, this kind of FBG sensor shows advantages of high prefabricated success rate and easy installation.

关 键 词：传感器 增敏 光纤布拉格光栅 应变传感器 静压预制桩 模型实验 

分 类 号：O436[机械工程—光学工程]