Analytical study of ground motion caused by seismic wave propagation across faulted rock masses |
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| Authors: | JC Li NN Li SB Chai HB Li |
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| Affiliation: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China;2. University of Chinese Academy of Sciences, Beijing, China;3. School of Civil Engineering, Chang’ an University, China |
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| Abstract: | Studying seismic wave propagation across rock masses and the induced ground motion is an important topic, which receives considerable attention in design and construction of underground cavern/tunnel constructions and mining activities. The current study investigates wave propagation across a rock mass with one fault and the induced ground motion using a recursive approach. The rocks beside the fault are assumed as viscoelastic media with seismic quality factors, Qp and Qs. Two kinds of interactions between stress waves and a discontinuity and between stress waves and a free surface are analyzed, respectively. As the result of the wave superposition, the mathematical expressions for induced ground vibration are deduced. The proposed approach is then compared with the existing analysis for special cases. Finally, parametric studies are carried out, which includes the influences of fault stiffness, incident angle, and frequency of incident waves on the peak particle velocities of the ground motions. |
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| Keywords: | ground motion peak particle velocity rock fault seismic quality factor seismic wave propagation viscoelastic rock |
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