摘要
选用磁偶极源为初始激发源,以无源麦克斯韦微分方程组为基础,采用显式差分方程推导了含低阻异常体的均匀全空间下的瞬变电磁场的三维时域有限差分形式,在改进的非均匀网格模型中,验证了数值模拟的准确性。模拟计算了全空间瞬变电磁场的传播以及不同距离和厚度的含导水断层的响应特征,简要分析特征规律。结果表明:含导水断层对磁场分布影响较大,瞬变电磁场含导水断层响应的起始时间受距离影响,而响应的时间范围和幅度则由距离和厚度共同影响,为解释全空间TEM含导水断层提供参考。
Finite- difference time- domain method was used to simulate the finite- difference time- domain format of transient electromagnetic field in the uniform whole space with low- resistant anomalous objects,by using magnetic dipole source,and based on the passive Maxwell differential equation in the improved non- uniform grid model,then verify the accuracy of numerical simulation. The characteristics and laws were analyzed based on numerical modeling of diffusion of the whole space transient electromagnetic field and response characteristics of the containing water conductive fault with different thickness and depth. The results showed that the containing water conductive fault has obvious effect on the distribution of magnetic field,the starting time of the response of transient electromagnetic with the containing water conductive fault is influenced by the distance,and the response time of the scope and magnitude by the common effect of the distance and the thickness,the objectives are to provide reference for the containing water conductive fault of the whole- space TEM.
出处
《煤矿安全》
CAS
北大核心
2015年第9期35-38,43,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(61362020)
广西自然科学基金资助项目(2013GXNSFAA019327
2013GXNSFFA019004)
桂林电子科技大学广西信息科学实验中心基金资助项目(20130112)
关键词
全空间瞬变电磁场
三维时域有限差分法
非均匀网格
数值模拟
含导水断层
whole-space transient electromagnetic field
3D FDTD method
non-uniform grid
numerical modeling
containing water conductive fault
