浅层瞬变电磁勘查技术试验研究

发布时间：2019-02-11 11:48

【摘要】：城市地下空间基础条件问题越来越受到重视,尤其是老城区杂乱的城市管线、岩溶分布区内地基、病害堤坝等浅层地质问题所带来的危害日趋严峻,因此高精度、高效率地探测浅层地质问题也就显得更加重要和迫切。基于上述现状和全程瞬变电磁法理论,本文针对浅层瞬变电磁勘查技术关于浅表层地质问题探测进行研究。论文在全程(全区)瞬变电磁法理论基础上,借助全程瞬变电磁场响应模拟程序,利用后处理软件(Voxler)对模拟数据进行可视化处理与分析,从理论上验证了浅层瞬变电磁勘查方法关于浅层问题探测的可行性和有效性。根据浅层地质问题类型,通过物理模型实验,对几种特殊异常体(球体、圆柱体、板状体、断层)和浅埋高／低阻管线、建筑场区灰岩地基的瞬变电磁感应电动势变化规律及全程视电阻率拟断面异常响应与目标物的对应关系进行模拟与讨论；通过现场探测试验和应用与直流电法对比,进一步验证了该方法技术关于浅层地质问题探测领域的可行性和有效性。根据模拟结果,进行现场探测试验,完成了浅埋隧道、拱桥、控水涵管试验。现场探测结果表明,浅层瞬变电磁勘查技术能够准确反映浅层目标体埋深和空间展布特征；对高、低阻目标体横向定位准确,低阻响应纵向揭露埋深比实际偏大,高阻偏小,对现场探测试验研究具有重要指导意义。论文对浅层瞬变电磁勘查技术关于低阻覆盖层下目标体探测存在的问题及浅层瞬变电磁仪器发展等方面进行了思考,为将来浅层瞬变电磁勘查技术更好地发展提供研究思路。
[Abstract]:More and more attention has been paid to the basic conditions of urban underground space, especially the hazards brought by shallow geological problems such as urban pipelines in old urban areas, inland foundations in karst distribution areas, dykes and dams, and so on. It is more important and urgent to detect shallow geological problems efficiently. Based on the present situation above and the theory of transient electromagnetic method in the whole process, this paper studies the exploration of geological problems of shallow surface layer by using transient electromagnetic survey technology in shallow layer. Based on the theory of whole (whole area) transient electromagnetic method, this paper uses the whole transient electromagnetic field response simulation program and the post processing software (Voxler) to process and analyze the simulation data visually. The feasibility and effectiveness of shallow transient electromagnetic exploration method for shallow layer problem detection are theoretically verified. According to the types of shallow geological problems and physical model experiments, several special abnormal bodies (sphere, cylinder, plate, fault) and shallow buried high / low resistance pipelines are studied. The transient electromagnetic induction electromotive force (EMF) of limestone foundation in the building field is simulated and discussed, and the relationship between the anomalous response of the whole apparent resistivity pseudo section and the object is simulated and discussed. The feasibility and effectiveness of this method in shallow geological problem detection are further verified by comparison of field detection test and application with DC method. According to the simulation results, the field detection test was carried out, and the shallow buried tunnel, arch bridge and water control culvert test were completed. The field detection results show that the shallow transient electromagnetic exploration technology can accurately reflect the buried depth and spatial distribution characteristics of shallow target body. It can be used to locate the high and low resistance objects accurately, and to reveal the depth of the buried depth in the longitudinal direction of the low resistance response is larger than the actual one, and the high resistance is smaller than that of the real object, which is of great significance to the field detection and test research. In this paper, the problems existing in the detection of objects under the low resistivity overburden and the development of the shallow transient electromagnetic instruments are considered, which provides the research ideas for the better development of the shallow transient electromagnetic exploration technology in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325

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