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- W2374292012 abstract "The seismic wave field in layered coal seam is simulated with coal road model.Propagation characteristics of seismic wave in horizontally stratified coal seam are analyzed.The results showed:(1) the P-wave source in the coal bed floor before coal heading face can excite Rayleigh channel wave in coal seam.The energy of Rayleigh channel wave is stronger than body waves.The wave train of Rayleigh channel wave is longer than body waves.And wave velocity is lower than body waves.(2) The Rayleigh channel wave generates reflected Rayleigh channel wave on the small structure before coal heading face.The energy of vertical component of Rayleigh channel wave is stronger than horizontal component energy.The reflected Rayleigh channel wave is converted into Rayleigh surface wave at the head of the coal roadway.Rayleigh surface wave can be recorded along the floor of tunnel.The Rayleigh surface wave is recorded last in time domain.The time interval between Rayleigh surface wave arrival time and others′ is longer.And it is easily recognized and extracted in seismic records.The energy of vertical component of the Rayleigh surface wave is higher than horizontal component.(3) In same conditions,the method of reflected-wave seismic prediction ahead is not applicable for detecting small structure before coal heading face.The energy of reflection waves from the interfaces of small structure before coal heading face is very low.Under the influence of high-amplitude reflection waves excited on the interfaces of roof,floor and coal heading face in coal tunnel,it is difficult to recognize and extract the reflected-wave of small structure before coal heading face in seismic records." @default.
- W2374292012 created "2016-06-24" @default.
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- W2374292012 date "2012-01-01" @default.
- W2374292012 modified "2023-09-24" @default.
- W2374292012 title "The method of small structure prediction ahead with Rayleigh channel wave in coal roadway and seismic wave field numerical simulation" @default.
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