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坑道掘进瞬变电磁超前探水解释方法的改进研究

胡雄武, 张平松, 严家平, 郭立全

胡雄武, 张平松, 严家平, 郭立全. 坑道掘进瞬变电磁超前探水解释方法的改进研究[J]. 岩土工程学报, 2014, 36(4): 654-661. DOI: 10.11779/CJGE201404009
引用本文: 胡雄武, 张平松, 严家平, 郭立全. 坑道掘进瞬变电磁超前探水解释方法的改进研究[J]. 岩土工程学报, 2014, 36(4): 654-661. DOI: 10.11779/CJGE201404009
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HU Xiong-wu, ZHANG Ping-song, YAN Jia-ping, GUO Li-quan. Improvement of means for interpretation of advanced water detection of tunnels by transient electromagnetic method[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(4): 654-661. DOI: 10.11779/CJGE201404009
Citation: HU Xiong-wu, ZHANG Ping-song, YAN Jia-ping, GUO Li-quan. Improvement of means for interpretation of advanced water detection of tunnels by transient electromagnetic method[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(4): 654-661. DOI: 10.11779/CJGE201404009
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坑道掘进瞬变电磁超前探水解释方法的改进研究  English Version

  • 安徽理工大学地球与环境学院 安徽 淮南 232001

基金项目: 国家自然科学基金重点项目（5113012）
详细信息
    作者简介:

    胡雄武(1984- ),男,博士研究生,主要从事岩土工程物探理论与应用研究。E-mail: huxiongwu1984@126.com。

  • 中图分类号: P631

Improvement of means for interpretation of advanced water detection of tunnels by transient electromagnetic method

  • School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China

摘要

    摘要
  • 摘要: 瞬变电磁方法已在坑道超前探水中发挥重要作用。因实际测试时存在电流关断时间,激励场不再满足阶跃关断条件。以水平电偶极子瞬变场响应为基础,给出坑道瞬变电磁多匝小回线中心阶跃瞬变场表达式。通过对3种非阶跃关断瞬变场的响应计算,确定了关断时间的影响范围,指出关断时间的影响对于坑道掘进前方浅部含水体的探测不可忽略。推导了全空间线性关断条件下全程视电阻率算法,从而改进坑道超前探水解释方法。物理模型实验和实例应用结果表明,该方法对于坑道掘进前方浅部含水体的空间划分更好,增强了瞬变电磁法对岩层富水特性的判定能力。
    Abstract: The transient electromagnetic method has played an important role in detecting the water bearing ahead of tunnels. Because of the existence of turn-off time in practical application, the exciting field can not satisfy the step turn-off condition. An expression for the step at the central point of small multi-turn loop is given based on the transient field of level electric dipole. Through the analysis of the transient field induced by three non-step turn-off currents, the influence range of the turn-off time is determined. It indicates that the detecting influence of the turn-off time on superficial part containing water ahead of the tunnel cannot be neglected. To improve the means for interpretation of water detection, the algorithm for the whole period apparent resistivity is derived in full space. Physical model tests and practical applications show that this improvement algorithm is more satisfactory to divide the space of superficial part containing water and increases the judgement capability of its aquosity.
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    • 参考文献(17)
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出版历程
  • 收稿日期:  2013-06-02
  • 发布日期:  2014-04-21

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