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矿井煤层中激发产生的地震波类型复杂,导致对各类地震波的认识存在争议.本次研究从几何运动学角度出发,分析槽波传播时间与炮检距之间的关系,由于槽波具有频散特性,无法给定具体的时距方程,通过推导发现槽波的最小群速度,即埃里相速度为固定值,因此可得到槽波埃里相的时距方程.同时推导了透射法槽波地震勘探中直达波和折射波的时距方程.认为三者的时距曲线在炮集记录上均为双曲线,双曲线最小值和曲率与煤层和围岩速度相关.对比分析三者的时距特征,对实际槽波记录中地震波类型划分有了新的认识,折射纵波最先到达,最后接收到的为槽波埃里相,中间为横波与纵波的叠合.
The types of seismic waves excited in the coal seam are complex, which leads to the controversy over the understanding of various types of seismic waves.In this study, the relationship between the slot wave propagation time and the offset is analyzed from the perspective of geometric kinematics. Characteristics, can not be given specific time-distance equation, by deducing the discovery of the minimum group velocity of the groove wave, that is, the velocity of the Erie phase is a fixed value, so the slot-wave Erie phase distance equation can be obtained. Seismic exploration of direct wave and refracted wave time-distance equation .Third time-span curve recorded in the gun set are hyperbolic curve, the hyperbolic minimum and curvature and the coal seam and the surrounding rock velocity correlation analysis of the three From the characteristics, we can get a new understanding of the types of seismic waves in the actual groove records. The first arrival of the refracted P-wave is the groove wave Ereli and the middle is the superposition of the S-wave and the P-wave.