摘要
为了寻求解决煤矿水害事故的办法,以电磁场和电磁波传播理论为基础,首先研究了电磁场的时域有限差分法计算方法,推导出了二维的时域有限差分方程和网格空间步长、时间步长所满足的关系式,得出了在完全匹配层吸收层的网格差分格式。然后建立了探地雷达二维正演模型,数值求解合成了雷达记录剖面。在雷达剖面图中可以清晰看到异常体的反射曲线,直观地了解岩溶雷达反射剖面特征,有利于在实际探测中提高解释精度。
In order to search the method of settling water accident in coal mine, firstly based on the theory of electromagnetic field and electromagnetic wave, studied the numerical calculation method of electromagnetic field, finite-difference time-domain （FDTD）, and deduced two-dimensional Finite Difference Time Domain equations, the relational expression of grid space step and time step, and the grid differential format in PML absorbing layers. Secondly, established a two-dimensional GPR forward model, and the radar profiles were synthesized using FDTD method. It was clear to see the abnormal body＇s reflected curves and intuitive to understand the karst＇ s characters in the radar profiles, which were helpful to improve the accuracy of interpretation in actual detection.
出处
《江西科学》
2009年第1期145-148,共4页
Jiangxi Science
