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基于布拉格光栅传感器的桥墩基础冲刷动态监测试验

, PP. 125-130

Keywords: 桥梁工程,桥墩,试验研究,布拉格光纤光栅传感器,冲刷,动态监测

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Abstract:

?为长期有效监测桥墩基础冲刷作用,基于露出河床的布拉格光栅传感器(FBG传感器)的不同相对位置以及对水流力和结构弯曲的波长变化,提出了一种新的桥墩冲刷动态监测方法;详细介绍了其工作原理,并给出基于该工作原理的监测设计方案,同时介绍了监测设备的制作步骤和设备保护措施设计;按照所提出的监测原理以及监测设备,采用足尺试验模型于实验室水槽中进行基础冲刷模拟试验,模拟了监测冲刷和冲刷回填全过程。结果表明:通过对2次典型试验工况结果的数据分析,证明FBG传感器可实现长期实时监测桥墩冲刷发展和冲刷后河床回填的全过程,为今后实际工程中的桥墩基础冲刷长期实时监测提供理论依据;该监测设备耐久性高,数据准确稳定,不受外界因素(如极端天气)干扰,具备良好的野外应用可行性与优越性。

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