煤矿陷落柱的地震响应特征与识别

Seismic response and identification of coal mine collapse columns

根据煤矿陷落柱的地质特征,设计了两类非均匀陷落柱模型,通过有限差分法模拟陷落柱的地震波场.通过对模拟波场叠加剖面和偏移剖面的对比,得出了大、小陷落柱的地震响应特征,并指导了实际地震剖面的陷落柱识别.结果表明:大的陷落柱的地震响应在时间剖面上特征表现为标准反射波的中断;而较小的陷落柱的地震响应在时间剖面上特征表现为弱反射能量异常.

According to the geology features of collapse columns in coal mines,two types of inhomogeneous collapse columns are designed and finite difference method is used to model the seismic wavefields of collapse columns.Through the comparison of stacked and migrated modeling wavefields,the seismic response features of big and small collapse columns are derived to direct actual seismic identifications of collapse columns.It is concluded that in seismic time profile big collapse column shows obvious discontinuousness,while the small shows weak reflection energy abnormity.