TITLE:
Theoretical Study of Coupling Mechanism between FBG and Shock Waves of Rock Burst
AUTHORS:
Shiming Wei, Zesheng Zhang, Yao Wang
KEYWORDS:
Rock Burst, FBG, Shock Waves, Lithological Characteristics
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.8 No.4,
November
25,
2020
ABSTRACT: To achieve
the monitor of rock burst in coal mine with fiber Bragg grating (FBG) sensing, the
coupling mechanism between FBG and shock waves was theoretically analyzed. Based on Housner’s random shock
model, the coupling mechanism between shock waves and FBG was theoretically
analyzed. The result shows that the wave will change the period Ʌand
effective refractive index n of FBG, and further
affect the initial wavelength value. The amplitude, phase and frequency of
shock wave are directly related to the wavelength drifts of FBG. The
transmitting velocity of shock wave in rock is affected by lithologic
characteristics. The Elastic modulus, density and Poisson’s ratio of rock
influence the initial wavelength value of FBG. This study provided a
theoretical basis and practical application guidance for coal or rock burst
monitoring with FBG sensing.