高频大地电磁法在慈母山隧道勘察中的应用
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摘要
慈母山隧道是重庆市城市快速干道之"三横线"的关键节段工程,隧址区地形地质条件复杂,隧道涌突水、断层破碎带、煤系地层与瓦斯成为工程的主要不良地质和施工地质灾害问题。为查明上述不良地质,沿隧道轴线采用高频大地电磁测深(EH-4电导率系统)方法开展地球物理探测,并根据探测结果,圈定了低阻异常区,与隧道施工开挖对比分析表明,发生涌水的位置、断层的位置均处于低阻异常范围内。实践表明,该方法探测深度大、精度较高,有助于查明隧道富水条件、断层带等不良地质体,提高隧道宏观超前地质预报的准确性。
Chimushan Tunnels are key project of "Three transverse lines" quick highway in Chongqing City,topography and geomorphology are very complex in the engineering region,gushing water,fault fracture zone,coal measure strata and gas are the main unfavorable geological conditions and construction geology disasters in the tunnels project,the high frequency magneto telluric method(EH-4 system)is used to finding out these unfavorable geological conditions.According to the result of detecting,the ano-maly area of low resistance is determined,comparative analysis with reality conditions after tunnel excavation is carried out,it shows that the site of occurring gushing water and fault fracture zone are in range of low resistance anomaly area.The merits of high frequency magneto telluric method(EH-4 system) are detecting great depth and high accuracy.The practices show it is advantageous to finding out unfavorable geological conditions,such as rich water,fault,to improving accuracy of advance geological prediction in tunnel.
Chimushan Tunnels are key project of "Three transverse lines" quick highway in Chongqing City,topography and geomorphology are very complex in the engineering region,gushing water,fault fracture zone,coal measure strata and gas are the main unfavorable geological conditions and construction geology disasters in the tunnels project,the high frequency magneto telluric method(EH-4 system)is used to finding out these unfavorable geological conditions.According to the result of detecting,the ano-maly area of low resistance is determined,comparative analysis with reality conditions after tunnel excavation is carried out,it shows that the site of occurring gushing water and fault fracture zone are in range of low resistance anomaly area.The merits of high frequency magneto telluric method(EH-4 system) are detecting great depth and high accuracy.The practices show it is advantageous to finding out unfavorable geological conditions,such as rich water,fault,to improving accuracy of advance geological prediction in tunnel.
引文
[1]王烨,曹哲明,汤井田,等.铁路隧道工程勘察中高频大地电磁测深应用效果研究[J].工程地质学报,2005,13(3):424-428.
[2]李金铭,罗延钟.电法勘探新进展[M].北京:地质出版社,1996.
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[4]伍岳.EH-4电磁成像系统在砂岩地区勘查地下水的应用研究[J].地下水,1999,23(5):335-346.
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[6]杨毅明,化希瑞.高频大地电磁测深在深埋隧道中应用实例分析[J].工程地球物理学报,2009,(S1):37-41.
[7]姜鹰,曹哲明,刘铁.高频大地电磁法在宜万铁路隧道岩溶的应用[J].工程地球物理学报,2006,(3):206-210.
[8]欧阳承新,王时平,全德辉,等.高频大地电磁测深在断层构造探测中的应用研究[J].世界地震工程,2007,(3):138-141.
[9]重庆市市政勘察设计研究院.慈母山隧道及连接道(峡江路)市政工程工程地质勘察报告[R].2007.
[10]劳雷公司.EH-4操作手册[M].1998.
[2]李金铭,罗延钟.电法勘探新进展[M].北京:地质出版社,1996.
[3]曹哲明.音频大地电磁法在宜万铁路隧道勘察中的应用效果[J].铁道勘察,2004,(1):53-55.
[4]伍岳.EH-4电磁成像系统在砂岩地区勘查地下水的应用研究[J].地下水,1999,23(5):335-346.
[5]刘坡拉.高频大地电磁法在宜万铁路隧道岩溶勘察中的应用[J].中国水运,2009,(8):195-196.
[6]杨毅明,化希瑞.高频大地电磁测深在深埋隧道中应用实例分析[J].工程地球物理学报,2009,(S1):37-41.
[7]姜鹰,曹哲明,刘铁.高频大地电磁法在宜万铁路隧道岩溶的应用[J].工程地球物理学报,2006,(3):206-210.
[8]欧阳承新,王时平,全德辉,等.高频大地电磁测深在断层构造探测中的应用研究[J].世界地震工程,2007,(3):138-141.
[9]重庆市市政勘察设计研究院.慈母山隧道及连接道(峡江路)市政工程工程地质勘察报告[R].2007.
[10]劳雷公司.EH-4操作手册[M].1998.
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