煤层内断层在双巷声波CT重建图像中的表现
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摘要
双巷声波CT采集系统是矿井煤层构造探测的实际应用系统 .在该系统下 ,建立煤层断层数值模型 ,利用精确和快速的直射线追踪方法 ,正演计算声波到时 ,通过BPT ,ART反演方法重建图像 .当断层走向与巷道测线不平行时 ,煤层内断层重建图像清晰 .实际矿井工作面回风巷与运输巷之间的声波CT探测实验结果表明 :煤层内断层在这种不完备的双巷声波CT采集系统的反演图像中 ,除走向断层外 ,断层图像呈线性规律分布 ,空间收敛性好 ,正断层多表现为低慢度 (较高速度 )特征 .该系统使双巷声波CT采集系统超前探测煤层构造成为可能
Two gateways sound wave CT system is the system that can actually be applied in detecting the structure in coal seam. By constructing the numerical simulation of the fault in coal seam, using accurate and fast linear ray tracing method, the arrival time of sound wave is forwards calculated, and the image is reconstructed by BPT and ART inversion methods. When the strike of fault is not parallel with the measuring line in the gateway, the reconstruction image of fault in coal seam is clear. According to the result of practiced CT detection between tailgate and headgate, except for the strike faults, faults in coal seam have a linear distribution in the inversion image of this uncompleted two gateways sound wave CT system. The fault appears good spatial convergence. The normal fault always appears as low slowness(high speed), this makes it possible to detect in advance the structure in coal seam by two gateways sound wave CT system.
Two gateways sound wave CT system is the system that can actually be applied in detecting the structure in coal seam. By constructing the numerical simulation of the fault in coal seam, using accurate and fast linear ray tracing method, the arrival time of sound wave is forwards calculated, and the image is reconstructed by BPT and ART inversion methods. When the strike of fault is not parallel with the measuring line in the gateway, the reconstruction image of fault in coal seam is clear. According to the result of practiced CT detection between tailgate and headgate, except for the strike faults, faults in coal seam have a linear distribution in the inversion image of this uncompleted two gateways sound wave CT system. The fault appears good spatial convergence. The normal fault always appears as low slowness(high speed), this makes it possible to detect in advance the structure in coal seam by two gateways sound wave CT system.
引文
[1] 刘盛东 ,李承华 .透射地震层析成像中射线追踪技术 [J] .淮南工业学院学报 ,1999( 1) :1～ 4
[2 ] 赫尔曼 .由投影建图像 :CT的理论基础 [M ] .北京 :科学出版社 ,1985
[3] 刘盛东 ,成春奇 ,程学松 ,等 .矿业工程中的地震CT技术 [A] .世纪之交煤矿地质学术论文集 [C] .西安 :西安地图出版社 ,1999.4 50～ 4 53
[2 ] 赫尔曼 .由投影建图像 :CT的理论基础 [M ] .北京 :科学出版社 ,1985
[3] 刘盛东 ,成春奇 ,程学松 ,等 .矿业工程中的地震CT技术 [A] .世纪之交煤矿地质学术论文集 [C] .西安 :西安地图出版社 ,1999.4 50～ 4 53
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