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Theoretical Study of Coupling Mechanism between FBG and Shock Waves of Rock Burst

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Document pages: 8 pages

Abstract: To achievethe monitor of rock burst in coal mine with fiber Bragg grating (FBG) sensing, thecoupling mechanism between FBG and shock waves was theoretically analyzed. Based on Housner’s random shockmodel, the coupling mechanism between shock waves and FBG was theoreticallyanalyzed. The result shows that the wave will change the period &#581 andeffective refractive index n of FBG, and furtheraffect the initial wavelength value. The amplitude, phase and frequency ofshock wave are directly related to the wavelength drifts of FBG. Thetransmitting velocity of shock wave in rock is affected by lithologiccharacteristics. The Elastic modulus, density and Poisson’s ratio of rockinfluence the initial wavelength value of FBG. This study provided atheoretical basis and practical application guidance for coal or rock burstmonitoring with FBG sensing.

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