The propagation and attenuation laws of blast-induced shock wave in coal and rock are always one of the key research topics in geophysics and geotechnical engineering. When a blast-induced shock wave propagates in a single medium, it will be attenuated by geometric spreading. Simultaneously, because of the plasticity,non-linear and viscous damping actions of the coal and rock materials, etc., the energy of shock wave will be rapidly attenuated. But when a shock wave propagates in a layered seam, undergoing the coal and rock surface refraction and reflection process, the energy loss level is consistent with the surface characteristics, the coal and rock wave impedance of both sides of surface, the propagation direction, and the surface angle.In summary, blast-induced shock wave propagation in coal and rock materials is a very complicated question, which still cannot be interpreted by a unified expression in theory.
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