全空间效应下瞬变电磁法三维数值模拟

孙玉国; 谭代明

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铁道工程学报 ›› 2010, Vol. 27 ›› Issue (3) : 76-80.

路网研究

全空间效应下瞬变电磁法三维数值模拟

孙玉国1；谭代明2

作者信息 +

3D Numerical Simulation to Transient Electromagnetic Method under Effect of Whole-space

SUN Yu-guo1, TAN Dai-ming2

Author information +

文章历史 +

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0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。

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 of induced eddy current are simulated in whole-space of tunnel without abnormal body and with abnormal body by using ANSYS, and the distribution laws of magnetic flux density along a measuring line with abnormal bodies deflecting from centre and with abnormal bodies at centre are compared. It is significant to the research and wide application of transient electromagnetic method.

Research conclusions：The transient electromagnetic fields in tunnel appears propagation property of "water wave effect" other than "smoking ring effect" on ground. The low conductive body in tunnel obviously changes the time -domain property of eddy current to indicate the induction characteristic of abnormal body. The maximum of magnetic flux density occurs on the other side of centre due to the deflection of abnormal body from the centre line.

导出引用

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, 27(3): 76-80

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, 27(3): 76-80

中图分类号： TM92

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