摘要
光纤布拉格光栅(fiber Bragg grating,FBG)传感器是测量土工格栅表面应变的一种重要方法,由于胶结层的存在使得土工格栅的真实应变和FBG传感器所测得的应变之间存在一个应变传递系数。以表面粘贴式裸光纤光栅为研究对象,通过建立光纤层-胶结层-基体层的理论模型,推导出了光纤层与基体层之间的应变传递公式,分析了各材料参数对应变传递系数和平均应变传递系数的影响。通过室内拉伸试验与验证试验验证了应变传递理论的正确性。结果表明:真实值与理论值的最大误差在15%左右。通过参数分析得:各材料参数对平均应变传递系数的影响程度从大到小依次为光纤光栅粘贴长度、胶结层厚度、基体层剪切模量、胶结层宽度和胶结层剪切模量,分别占33%、23%、20%、13%和11%。
The fiber Bragg grating(FBG) sensor is an important tool to measure the surface strain of geogrid. There is a strain transfer coefficient between the real strain of geogrid and the strain measured by FBG sensor due to the existence of adhesive layer. In this study, by taking surface-bonded bare fiber Bragg grating as the research object, the strain transfer formula between fiber layer and matrix layer is derived by establishing the theoretical model of fiber layer, adhesive layer and matrix layer. In addition, the effects of material parameters on the strain transfer coefficient and the average strain transfer coefficient are analyzed. Then, through laboratory tensile test and verification test, the correctness of this newly proposed theory for strain transfer is verified. The results show that the maximum error between the measured value and the theoretical value is about 15%. According to the parameter analysis, the influence of different material parameters on the average strain transfer coefficient can be arranged in a descending order as follows: the FBG bond length, the thickness of the adhesive layer, the shear modulus of the matrix layer, the width of adhesive layer and the shear modulus of adhesive layer, accounting for 33%, 23%, 20%, 13% and 11% respectively.
作者
洪成雨
杨强
赵勇
陈登伟
喻伟
HONG Cheng-yu;YANG Qiang;ZHAO Yong;CHEN Deng-wei;YU Wei(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China;Underground Polis Academy,Shenzhen University,Shenzhen,Guangdong 518060,China;China Railway Southern Investment Group Co.,Ltd.,Shenzhen,Guangdong 518000,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2021年第6期1755-1764,共10页
Rock and Soil Mechanics
基金
国家自然科学基金(No.U2034204)
国家自然科学基金面上项目(No.52078303)。
