The results show the influence of conductivity is minor and can be ignored when the tunnel wall conductivity value is lower than the breakpoint; however, when the value is bigger than the breakpoint, the influence is greater.

• 研究结果显示：当电导率小于断点时，电磁波衰减率几乎不受影响，当电导率高于断点时，电磁波传播特性会有较大的变化。