Numerical simulation of fore detecting with seismic in coal roadway and study of wave field characteristics
Numerical simulation of fore detecting with seismic in coal roadway and study of wave field characteristics
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发表时间：
2010
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通讯作者：
Cheng Jiulong
中科院分区：
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作者：
Cheng Jiulong
采用交错网格有限差分法对两种煤层地质模型中的地震波场进行了数值模拟，分析了不同模型中地震波场特征和各种波型的传播特征，结果表明，如果采煤工作面前方存在地质界面，最高-记录地质界面的振幅衍射波，最后记录衍射波，衍射波之间的时间间隔衍射波的波至时间较长，衍射波的波列较宽，可以用来识别工作面前的地质界面，地质界面的反射波也是工作面前地质界面的标志，但反射波往往与其它波混在一起，往往无法区分。
Seismic wave field in two geological models of coal seam was simulated by using staggered-grid finite difference method,and seismic wave field characteristics and propagation characteristics of various wave patterns in different models were analyzed.As a result,if there is a geological interface before coal face,the high-amplitude diffraction wave of geological interface will be recorded.The diffraction wave is recorded last.The time interval between diffraction wave arrival time and others'is longer.The diffraction wave train is wider than other waves.So diffraction wave can be used to identify geological interface before coal face.Reflected waves of geological interface are marks of geological interface before coal face also.But reflected waves are usual mixing with other waves,so they can't be distinguished usually.