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| P-wave propagation across a viscous-elastic rock mass with a structural plane |
| WANG Hao1，2，CHAI Shaobo1，2，YU Liyuan2，JING Yanlin1，ZHOU Tao1 |
| (1. School of Civil Engineering，Chang?an University，Xi?an，Shaanxi 710064，China；2. State Key Laboratory for GeoMechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China) |
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Abstract The propagation of stress waves in discontinuous structural plane such as jointed rock mass and weak interlayer is an important research direction of rock dynamics. The time delay and amplitude attenuation always occur, as the wave across viscoelastic rock. The rock mass was assumed as the Kelvin body in this paper，and the wave propagation equation in the viscoelastic body is established using the wave quality factors. The interaction between the P wave and a linear elastic structural plane is analyzed. Based on the solution of the reflection coefficient of P wave passing through the structural plane in the frequency domain，the propagation rules of the planar stress wave in viscoelastic rock mass，which contains a linear elastic structure surface，was analyzed. Then the expressions of the transmission velocity of P and S waves at any point on the monitor-surface were obtained. The normal and tangential transmission coefficients of plane P wave through the structural plane of viscoelastic rock mass are calculated，using the superposition principle of wave. The parameter studies show that the attenuation and time delay are obvious，when the stress wave propagates in the viscous elastomer. And the structural surface characteristics and incident wave frequency have certain influence on the transmission coefficient.
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2020, Vol. 39 
