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A subgrade cracking monitoring sensor based on optical fiber sensing technique
Author(s) -
Liu Wanqiu,
Zhou Hongmei,
Wang Boshi,
Zhao Yanqing,
Leng Zhen,
Chen Xijie,
Li Linhua,
Wang Shujuan,
Chen Zhiguo
Publication year - 2018
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2213
Subject(s) - subgrade , reflectometry , cracking , optical fiber , fiber optic sensor , geotechnical engineering , structural engineering , materials science , engineering , remote sensing , time domain , environmental science , computer science , geology , composite material , telecommunications , computer vision
Summary The presence of cracks is ubiquitous and a major concern for subgrade. Effective detection and quantification of cracks in soil specimens or structures are the prerequisites for understanding the generation of cracks and their impacts. This paper introduces a cracking monitoring sensor for subgrade structure based on the Brillouin optical time domain analysis/reflectometry technique. The proposed sensor has been applied for the subgrade cracking monitoring of a test section of He‐da highway in China. The total covering length of the installed sensors is more than 200 m. Sensor data have been collected four times within a freezing and thawing cycle between November 2015 and May 2016. The test results prove that the proposed sensor has high survival rate after installation and high accuracy in cracking detection and quantification. The field application demonstrates the feasibility of the proposed sensor in systematic performance monitoring of pavement structure.