TSP信号采集质量影响因素的现场试验研究
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摘要
为了提高TSP现场信号采集的信噪比和预报准确度,通过现场试验、结论对比分析和理论分析的方法,对影响TSP信号采集质量的主要因素进行了研究,探讨了断层破碎带、瑞雷波和接收探杆的锚固耦合等影响因素对信号采集的影响方式.首次采用了单道信号分析的方法,对比分析了接收探杆的不同耦合方式和锚固强度对信号接收的干扰特点,并研究了减弱或消除干扰的接收探杆耦合方法.通过对瑞雷波的理论研究,分析了瑞雷波对信号采集的干扰原理,得出了增加接收探杆的锚固深度可显著减弱瑞雷波干扰的结论.
Effectiveness of seismic wave signal collection is the precondition for ensuring the accuracy in TSP forecast.In order to improve the signal-to-noise ratio, the main factors affecting TSP signal collection quality were studied by field test,comparative analysis of field test results,and theoretical analysis method.The influence mode of the fault belt,Rayleigh wave and the anchor coupling of the detecting rod on signal collection were studied.Different coupling methods and anchor strength of the detecting rod have different interferences on signal reception.The single-trace signal method was first applied to analyze the interference characteristics,and the weakening or eliminating interference method of detecting rod coupling methods were also studied.The interference principle of the Rayleigh wave to signal collection was analyzed with the Rayleigh wave theory,and a conclusion was obtained that the Rayleigh wave influence can be significantly weakened with increasing anchorage depth.
Effectiveness of seismic wave signal collection is the precondition for ensuring the accuracy in TSP forecast.In order to improve the signal-to-noise ratio, the main factors affecting TSP signal collection quality were studied by field test,comparative analysis of field test results,and theoretical analysis method.The influence mode of the fault belt,Rayleigh wave and the anchor coupling of the detecting rod on signal collection were studied.Different coupling methods and anchor strength of the detecting rod have different interferences on signal reception.The single-trace signal method was first applied to analyze the interference characteristics,and the weakening or eliminating interference method of detecting rod coupling methods were also studied.The interference principle of the Rayleigh wave to signal collection was analyzed with the Rayleigh wave theory,and a conclusion was obtained that the Rayleigh wave influence can be significantly weakened with increasing anchorage depth.
引文
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[4]温树林,吴世林.TSP 203在云南元磨高速公路隧道超前地质预报中的应用[J].地球物理学进展,2003,18(3):465-471.WEN Shulin,WU Shilin.Application of the TSP 203 system ingeological advanced prediction of Yuanmo expressway tunnel[J].Progress in Geophysics,2003,18(3):465-471.
[5]黄戡,彭建国,丁国华,等.TSP203在雪峰山隧道施工地质超前预报中的应用研究.地质与勘探,2006(5):106-109.HUANG Kan,PENG Jianguo,DING Guohua,et al.Applica-tion of TSP203 for geological advanced prediction in Xuefengs-han Tunnel[J].Geology and Prospecting,2006(5):106-109.
[6]荆学亚,梅建华,曹宁宇.TSP203地质超前预报系统在乌鞘岭隧道施工中的应用[J].铁道建筑技术,20049(S1):60-61.JING Xueya,MEI Jianhua,CAO Ningyu.Application ofTSP203 advance geological prediction system to WushaolingTunnel[J].Railway Construction Technology,2004(S1):60-61.
[7]陈革成.地震波测试与声波测试的差异及应用[J].水利科技,2003,3:34-36.CHEN Gecheng.Difference and application of seismic wavetest and sonic wave test[J].Hydraulic Science and Technolo-gy,2004,3:34-36.
[8]詹正彬,姚姚.多波及横波地震勘探[M].北京:地质出版社,1994.ZHAN Zhengbin,YAO Yao.Seismic exploration of multiplesweep and transverse wave[M].Beijing:Geological PublishingHouse,1994.
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