隧道全空间瞬变电磁任意点垂直磁场分量全域视电阻率解释方法研究

 针对目前隧道瞬变电磁超前预报主要利用垂直分量晚期视电阻率断面进行近似解释存在的不足，文中研究了隧道瞬变电磁任意共面垂直磁场全空间全域视电阻率解释方法。首先，从电偶极子的均匀全空间响应公式出发，通过对偶极子响应进行矢量叠加，计算隧道全空间回线源瞬变电磁场垂直分量的响应。然后，根据全空间磁场时域响应推导了隧道瞬变电磁共面垂直磁场的全域视电阻率的定义方法，介绍了利用反函数原理进行电阻率计算的数值迭代方法。最后，计算并分析了隧道腔体和含水体对视电阻率的影响。将文中解释方法与传统解释方法进行对比分析，计算结果表明，文中视电阻率定义方法较其他方法可以避免隧道腔体的影响，能够更好的对含水构造进行探测。

FULL-FIELD APPARENT RESISTIVITY DEFINITION OF UNDERGROUND TRANSIENT ELECTROMAGNETIC DATA

Considering the shortages of late time apparent resistivity interpretation of vertical component in Transient Electromagnetic Method (TEM) advanced prediction at present，this paper discusses full space and full zone apparent resistivity method of arbitrary coplane vertical magnetic component in tunnels. First，calculate the full space vertical response of loop source from response in homogeneous full space of electrical dipole and vector addition. Then，deduce the full zone apparent resistivity definition of TEM coplane vertical magnetic field from full space time domain response. Lastly，analyze the influence of tunnel cavity and aquifer structure. By comparing the method in this paper with traditional method，the results show that our method can effectively avoid the influence of tunnel cavity and is better in aquifer structure detection.