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。
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 all/at 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 aH/at.
出处
《物探与化探》
CAS
CSCD
2005年第6期533-536,540,共5页
Geophysical and Geochemical Exploration
基金
高等学校博士学科点专项科研基金资助课题(20050290501)
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
mine TDEM
transient field
numerical three-dimensional simulation
finite difference
