作　　者： ; ; ; ;

机构地区： 嘉应学院物理与光信息科技学院

出　　处： 《中国钨业》 2019年第3期7-11,共5页

摘　　要： 基于压电效应,研究理想平面纵波和衰减平面纵波两种情况下岩石产生的电磁信号在金属矿中的传播。根据金属矿岩中波矢量的改变,得到了两种纵波条件下金属矿岩中电场的表达式。通过对表达式的计算,结果表明:电场随着电导率、传播距离和初始损伤增大而不断减小。在电导率为10^-8S/m量级时,电导率对电场的衰减作用并不明显,当电导率增加到10^-4S/m量级时,电导率对电场的衰减逐渐增强。当电导率到达10^-2S/m时,电导率对电场的衰减作用十分显著。当电导率低于10^-3量级时,电导率对电场的衰减作用相比于初始损伤显得“弱”一些。当电导率增大到近10^-2S/m时,电导率对电场的衰减作用越来越“强”。 Based on piezoelectric effect, this paper studies the propagation of electromagnetic signals generated by rocks in metal ore rock under ideal plane P-wave and attenuated plane P-wave. According to the change of wave vector in metal ore rock, we obtain the expressions of electric field in metal mines under two kinds of longitudinal wave conditions. The results show that the electric field decreases with the adding conductivity, propagation distance and initial damage. When the conductivity is 10^-8 S/m, the attenuation effect of conductivity on electric field is not obvious. When the conductivity increases to 10^-4 S/m, the attenuation of conductivity to electric field gradually increases. When the conductivity reaches 10^-2 S/m, the effect of conductivity on electric field attenuation is very significant. When the conductivity is less than 10^-3 S/m, the attenuation effect of conductivity on electric field is weaker than that of initial damage. When the conductivity increases to nearly 10^-2 S/m, the attenuation effect of conductivity on electric field becomes stronger. The results of this study are basically consistent with those of other researchers.

关 键 词： 衰减 纵波 电磁信号 电导率

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