| 全空间效应下瞬变电磁法三维数值模拟 |
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| 引用本文： | 孙玉国,谭代明.全空间效应下瞬变电磁法三维数值模拟[J].铁道工程学报,2010(3). |
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| 作者姓名： | 孙玉国 谭代明 |
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| 作者单位： | 1. 中国中铁股份有限公司,北京,100039
2. 广东省铁路建设投资集团有限公司,广州,510635 |
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| 摘 要： | 研究目的:隧道采用瞬变电磁法进行地质超前探测时,激发电流断开瞬间将在掌子面前方和后方产生感应涡流场,接收线圈接收到的是整个围岩空间涡流场的叠加,不同于地面上只有地下半空间涡流场的叠加。本文利用ANSYS模拟隧道全空间无异常体和有异常体时感应涡流的传播特性,比较异常体在隧道中心和偏离中心时磁场沿水平测线的分布规律,对瞬变电磁法的研究和推广应用具有参考意义。研究结论:隧道中的瞬变电磁场表现为"水波效应"的传播特性,而非地面半空间的"烟圈效应";隧道中低阻异常体的出现,显著改变了涡流场的时域特性,使涡流场表现为异常体的感应特征;由于异常体偏离隧道中心而使相反一侧出现磁感应强度的极大值。
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| 关 键 词： | 全空间 瞬变电磁 数值模拟 三维 |
3D Numerical Simulation to Transient Electromagnetic Method under Effect of Whole-space |
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| SUN Yu-guo,TAN Dai-ming.3D Numerical Simulation to Transient Electromagnetic Method under Effect of Whole-space[J].Journal of Railway Engineering Society,2010(3). |
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| Authors: | SUN Yu-guo TAN Dai-ming |
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| Institution: | SUN Yu-guo1,TAN Dai-ming2(1.China Railway Group Limited,Beijing 100039,China 2.Guangdong Provincial Railway Construction Investment Group Co.Ltd.,Guangzhou,Guangdong 510635,China) |
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| Abstract: | Research purposes: When the transient electromagnetic method is used for the geological survey in advance for tunnel,the induced electromagnetic field will be generated in front and back of the working faces at the transient moment of disconnecting exciting current.What the receiving coil receives is the fold of the eddy current field of whole space of surrounding rock,different than that of the ground where there is the fold of eddy current of underground half-space.In this paper,the propagation properties... |
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| Keywords: | whole-space transient electromagnetic numerical simulation 3D |
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