煤巷地震超前探测数值模拟及波场特征研究
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摘要
用交错网格有限差分法对煤巷内不同地质模型中的弹性波场进行了数值模拟,分析了不同地质模型中的波场特征和各类波型的传播特征。研究表明:在工作面前方的构造界面上会产生能量较强的绕射波,绕射波波至最迟与其它波波至时间间隔较大,波列较宽是识别工作面前方存在构造界面的特征波。虽然在工作面前方构造界面上产生的反射波也标志工作面前方存在构造界面,但易与干扰波混杂在一起不易识别提取。
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.
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.
引文
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[2]沈鸿雁.反射波法隧道、井巷地震超前预报研究[D].西安:长安大学,2006.Shen Hongyan.Study on reflected-wave tunnel seismic prediction[D].Xi’an:Chang’an University,2006.
[3]朱光明,李桂花,程建远.煤矿巷道内地震勘探的数值模拟[J].煤炭学报,2008,33(11):1263-1267.Zhu Guangming,Li Guihua,Cheng Jianyuan.Numerical simulation of seismic survey in coalm ine roadway[J].Journal of China Coal Society,2008,33(11):1263-1267.
[4]Cosma C,Enescu N.Characterization of fractured rock in the vicinity of tunnels by the swept impact seismic technique[J].International Journal of Rock Mechanics&Mining Sciences,2001,38:815-821.
[5]Andisheh Alimoradi,Ali Moradzadeh,Reza Naderi,et al.Prediction of geological hazardous zones in front of a tunnel face using tsp-203and artificial neural networks[J].Tunnelling and Underground Space Technology,2008,23:711-717.
[6]Eduardo,Faria L,Paul,et al.Finite difference on minimal grids[J].Geophysics,1994,59(2):282-289.
[7]董良国,马在田,曹景忠,等.一阶弹性波方程交错网格高阶差分解法[J].地球物理学报,2000,43(3):411-419.Dong Liangguo,Ma Zaitian,Cao Jingzhong,et al.A staggered-grid high-order difference method of one-order elastic wave equation[J].Chinese Journal of Geophysics,2000,43(3):411-419.
[8]张平松,刘盛东.断层构造在矿井工作面震波CT反演中的特征显现[J].煤炭学报,2006,31(1):35-39.Zhang Pingsong,Liu Shengdong.Character appearance of fault struc-ture in seismic wave CT inversion for mine work faces detecting[J].Journal of China Coal Society,2006,31(1):35-39.
[9]薛亚东,张长根,李兴宏,等.采区断层探测与分布规律研究[J].煤炭学报,2003,28(5):523-516.Xue Yadong,Zhang Changgen,Li Xinghong,et al.Seismic explora-tion of fault in mining area and study on its distribution law[J].Journal of China Coal Society,2003,28(5):523-516.
[10]杨霖.绕射波在掘进巷道中超前探测小构造的应用[J].科技情报开发与经济,2006,16(10):268-269.Yang Lin.The application of diffracted wave in the advance detec-tion of the small structure in the tunneling[J].Sci-Tech.Informa-tion Development&Economy,2006,16(10):268-269.
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