光纤光栅和静态电阻在静压模型管桩测试中的对比试验研究

Research on comparison of fiber Bragg grating and static resistance used in Jacked model pipe pile test

为了提高光纤布拉格光栅(fiber Bragg grating,简称FBG)应变传感器测量精度,针对光纤光栅传感器在模型管桩试验应用情况,提出了一种光纤光栅传感器理论灵敏度系数和实验灵敏度系数应变标定方法。该方法通过实验标定微型光纤光栅应变传感器的灵敏度系数,与理论分析传感器灵敏度系数进行对比,同时在模型管桩安装传感器位置粘贴应变片。实验结果表明,标定后的FBG应变传感器测试结果更加准确,为基于FBG应变传感器的模型管桩监测技术奠定了基础。同时,该方法适用于FBG传感器应用与模型管桩前的标定,可以得到准确反映模型管桩受力变形的真实数据,提高了光纤光栅传感器在模型管桩试验中的测量精度。同时,该方法简单、易操作,为光纤光栅传感器在试验和工程中应用奠定了基础,加快了FBG传感器在模型管桩荷载传递监测应用的步伐。

In order to improve the measurement accuracy of fiber Bragg grating(FBG) strain sensors,a fiber grating sensor theoretical sensitivity coefficient and experimental sensitivity coefficient strain calibration method is proposed in view of the application of FBG sensors in the model pipe pile test.The method calibrates the sensitivity coefficient of the micro-gray grating strain sensor by experiment,and compares it with the theoretical analysis sensor sensitivity coefficient.At the same time the strain gauge is pasted on the model pipe of installing FBG sensor position.The experimental results show that the FBG strain sensor test results are more accurate,which lays a foundation for the model tube pile monitoring technology based on FBG strain sensor.At the same time,the method is applicable to the calibration of the FBG sensor application and the model pipe pile,and can obtain the real data accurately reflecting the deformation of the model pipe pile,and improve the measurement accuracy of the fiber grating sensor in the model pipe pile test.At the same time,the method is simple and easy to operate,which lays a foundation for the application of fiber Bragg grating sensors in testing and engineering,and accelerates the application of FBG sensors in the monitoring and application of model tube pile load transfer.