瞬变电磁在四川大渡河的应用

石家庄经济学院本科生毕业论文I摘要瞬变电磁法(简称TEM)，是近些年来发展比较迅速的一种电法勘探分支方法，其探测深度大，适应性强，具有灵敏度高、分辨率强，且在野外时仪器轻便，采集数据快速，成本低等诸多优点。在城市建设、交通、水利、环境保护、考古等方面广泛应用，成功地解决了众多的实际问题，有着十分广阔的应用前景，是地球物理勘探领域中的重要方法之一。本文对瞬变电磁法的理论做了系统的研究，将瞬变电磁法应用于四川省大渡河南广庙跨江大桥地质勘查中，通过视电阻率等值线剖面图解释水下卵石层厚度以及基岩埋深情况，并经过钻孔验证物探解释的准确性，最终综合两种方法确定卵石层厚度和基岩埋深。关键字：瞬变电磁法,地质勘查,钻孔ABSTRACTTransientElectromagneticMethod(calledTEM),isabranchofelectricalprospectingmethodwhatdevelopingrelativelyrapidinrecentyears.Ithassomeadvantages,likeprobingdepth,adaptability,highsensitivity,strongresolution,andinthefield,theinstrumentislightweight,fastingdataacquisition,andlowcost.Itiswidelyusedinurbanconstruction,transportation,waterconservancy,environmentalprotection,archaeologic,etc,successfullysolvedmanypracticalproblems,hasaverybroadapplicationprospects,isoneoftheimportantmethodsinthefieldofgeophysicalexploration.Inthispaper,todoasystematicstudyoftransientelectromagneticmethod.TheTransientElectromagneticMethodwasappliedtothegeologicalexplorationofDaduRiverinSichuanprovince,GuangmiaoAcrossBridgeinHenan,throughApparentResistivityContourSectionalViewtoknowthethicknessofunderwatergravellayerandtheconditionsofdeepbedrock,andthentoverifytheaccuracyoftheexplanationofphysicaldetection.Atlast,todeterminethethethicknessofunderwatergravellayerandtheconditionsofdeepbedrockforcomp;exingthetwomethods.Keywords:TransientElectromagneticMethods,geologicalexploration,drilling石家庄经济学院本科生毕业论文II目录中英文摘要.............................................................................................................Ⅰ1绪论.......................................................................................................................11.1瞬变电磁法的发展............................................................................................12瞬变电磁法勘探的理论概述...............................................................................12.1瞬变电磁勘法探的原理特点.............................................................................22.1.1瞬变电磁法勘探原理......................................................................................22.2瞬变电磁法勘探的理论基础.............................................................................22.3瞬变电磁法勘探的装置.....................................................................................32.4资料处理[5].........................................................................................................32.4.1资料解释.........................................................................................................32.4.2定量解释.........................................................................................................42.5低阻层对瞬变电磁场的屏蔽作用....................................................................62.5.1原理及其影响.................................................................................................63应用实例...............................................................................................................73.1测区内地球物理特征........................................................................................73.2仪器及方法........................................................................................................73.3工作完成情况以及数据收集............................................................................83.4资料处理..........................................................................................................103.4.1数据处理准备工作.......................................................................................103.4.2数据预处理...................................................................................................113.4.3数据滤波处理...............................................................................................123.5物探资料成果解释...........................................................................................133.6钻孔验证........................................................................................................1343.6.1钻孔目的及其布置.......................................................................................143.6.2钻探成果.......................................................................................................143.7结论..............................................................................................................15结论.........................................................................................................................16致谢.....................................................................................................................17参考文献.................................................................................................................18石家庄经济学院本科生毕业论文1瞬变电磁法在四川省大渡河南广庙跨河大桥勘查中的应用随着我国国民经济飞速发展，城市工程建设在规划、设计、施工阶段都必须对建设区域内地质情况有系统的了解，在工程施工过程中及建成后还需对工程质量进行监测和检测。另外，在工程抢险、地质灾害调查、考古等许多工作中也都需进行适当的探测工作[1,2]。工程上许多其它方法难以解决的问题可以通过物探的方法解决，工程物探有高效、快速、便捷、经济的特点，随着近年来城市化进程的加速，其方法技术、应用领域不断拓宽。工程物探在勘查能力和精度方面都有了较大提高，国际上工程物探已成为解决工程建设地质问题必不可少且最有效的技术手段。桥梁、大坝、码头、隧道、管道等大型建筑的建设中，不管是在可行性研究阶段，还是在初勘、详勘阶段，首要任务都是地质调查工作，而这些工程地质勘察常常需要在水上进行，与地面勘查工作相比，水上勘察工作的困难程度要大很多。因此，工程物探方法便从发挥着重要作用的陆地勘察中延伸到水域勘查中来[11]。1绪论1.1瞬变电磁法的发展美国科学家L