FBG-相似材料传感器埋入模型内部实验研究
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摘要
针对模型实验内部关键点的应变测量,设计并制作了光栅-相似材料传感器,与传统的应变砖法中,将光栅粘贴在立方体试件表面相比,该文将光栅埋入相似材料立方体试件内部,以消除边界效应的影响。通过对比实验,研究去涂覆层光栅在相似材料中的布设工艺,为验证所设计传感器应用于模型实验内部应变测量的可靠性,基于圣维南定理,将传感器埋入一边长是其3倍大的相似材料试件中心,以此在模拟实验中有围压的条件及消除边界效应的影响,实验结果验证了测量结果的可靠性。
A grating-similar material sensor has been designed and fabricated for the strain measurement of the key points in the model experiment interior.Different from the conventional brick strain method of which the grating is pasted on the surface of the cube specimens,the grating used in this work is embedded into the similar material cube specimens in order to eliminate the influence of boundary effect.Through the contrast experiment,the layout process of the decoated grating in the similar material is studied.In order to verify the reliability of the sensor used in the internal strain measurement experiment,based on Saint Venant theorem,the sensor is embedded into the center of the similar material specimen with the side length of 3times larger over the sensor to simulate the conditions of the actual experiment with the confining pressure and eliminate the boundary effect.The experimental results verify the reliability of the measurement results.
A grating-similar material sensor has been designed and fabricated for the strain measurement of the key points in the model experiment interior.Different from the conventional brick strain method of which the grating is pasted on the surface of the cube specimens,the grating used in this work is embedded into the similar material cube specimens in order to eliminate the influence of boundary effect.Through the contrast experiment,the layout process of the decoated grating in the similar material is studied.In order to verify the reliability of the sensor used in the internal strain measurement experiment,based on Saint Venant theorem,the sensor is embedded into the center of the similar material specimen with the side length of 3times larger over the sensor to simulate the conditions of the actual experiment with the confining pressure and eliminate the boundary effect.The experimental results verify the reliability of the measurement results.
引文
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[2]NANNI A,YANG C C,PAN K,et al.Fiber optic sensors for concrete strain stress measurement[J].Aci Materials Journal,1991,88(3):257-264.
[3]JOANNA W,MOLENDA M,HORABIK J,et al.Influence of grain shape and intergranular friction on material behavior in uniaxial compression:Experimental and DEM modeling[J].Powder Technology,2012,217(2):435-442.
[4]袁亮,顾金才,薛俊华,等.深部围岩分区破裂化模型试验研究[J].煤炭学报,2014,39(6):987-993.
[5]吴祖堂,陈志军,邹虹,等.采用光纤光栅传感器测量模型材料应变的原理和应用[J].机械设计与研究,2012,28(1):82-84.
[6]魏世明.岩体变形光纤光栅传感检测的理论与方法研究[D].西安:西安科技大学,2008.
[7]张强勇,李术才,郭晓红.组合式地质力学模型试验系统及其在分岔隧道工程中的应用[J].岩土工程学报,2007,29(9):1337-1343.
[8]王静.光纤光栅多参数传感理论技术研究及在地下工程灾害监测中的应用[D].济南:山东大学,2011.
[9]柴敬,赵文华,李毅,等.采场上覆岩层沉降变形的光纤检测实验[J].煤炭学报,2013,38(1):55-60.
[10]孙阳阳,王源,章征林,等.表面粘贴式光纤布拉格光栅应变传递规律分析与实验研究[J].功能材料,2016,3(47):02001-02006.