| 巷道围岩中瞬变电磁场三维数值模拟 |
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| 引用本文： | 周仕新,岳建华.巷道围岩中瞬变电磁场三维数值模拟[J].物探与化探,2005,29(6):533-536,540. |
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| 作者姓名： | 周仕新 岳建华 |
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| 作者单位： | 中国矿业大学,资源学院,江苏,徐州,221008 |
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| 基金项目： | 高等学校博士学科点专项科研基金资助课题（20050290501） |
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| 摘 要： | 为了进一步研究井中瞬变电磁法的问题, 建立了巷道和异常体模型, 用推导出的扩散方程的七点差分格式对磁偶极源激发的瞬变场进行了数值模拟。观察到 "烟圈"场在低阻体处早期等值线发生明显畸变, 随着时间的增加影响逐渐减弱;而巷道处的畸变较弱, 持续时间长。根据多个测点计算得到的数据, 绘制了磁场和和磁场对时间导数的等值线断面图, 显示等值线向低阻体处聚集畸变;而磁场对时间导数等值线的畸变可持续较长时间。
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| 关 键 词： | 井中瞬变电磁法 瞬变电磁场 三维数值模拟 有限差分 |
| 文章编号： | 1000-8918（2005）06-0533-04 |
| 收稿时间： | 2005-06-20 |
| 修稿时间： | 2005-06-20 |
NUMERICAL THREE-DIMENSIONAL SIMULATION OF TRANSIENT ELECTROMAGNETIC FIELD IN ROADWAY AND ITS SURROUNDING ROCKS |
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| ZHOU Shi-xin,YUE Jian-hua.NUMERICAL THREE-DIMENSIONAL SIMULATION OF TRANSIENT ELECTROMAGNETIC FIELD IN ROADWAY AND ITS SURROUNDING ROCKS[J].Geophysical and Geochemical Exploration,2005,29(6):533-536,540. |
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| Authors: | ZHOU Shi-xin YUE Jian-hua |
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| Institution: | China University of Mining and Technology, Xuzhou 221008, China |
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| Abstract: | To further study the problem of mine TDEM, the authors set up a model for the roadway and the abnormal body, and made numerical simulation of the transient field excited by a magnetic dipole source by using the seven node difference scheme of the diffusion equation. The result shows that the isolines of the "smoke ring" field where the conductor is located are obviously abnormal, and the effect of the conductor weakens with time. However, the abnormality where the roadway is located can last longer. The isoline section figures of the magnetic field and δH/δt are plotted on the basis of the data obtained at quite a few surveying points. The figures show that the isolines congregate towards the conductor, and the abnormality lasts longer in the isoline section figures of δH/δt. |
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| Keywords: | mine TDEM transient field numerical three-dimensional simulation finite difference |
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