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本文用有限单元法对二维直立极化板状体的中梯装置激电异常进行了数值计算。着重研究了:板状体导电性和截面几何尺度改变对激电异常的作用规律和覆盖层导电性改变对激电异常的影响以及利用激电异常剖面曲线的半极值点间弦长(q)和弦切距(m)求板状体顶深(h)的数值关系。数值结果表明:以往认为“利用IP(激发极化)法寻找赋存在高阻围岩中的矿体,比寻找赋存在低阻围岩中的矿体要容易”这一看法至少对本文中的情况不适用。就激电异常大小而言,高阻覆盖层对寻找赋存于其下部的盲矿体是有利的,而在低阻覆盖层条件下则很不利;数值计算得到的利用板状体ρs,ηs异常剖面曲线半极值点间弦长q和弦切距m求扳状体顶深的近似公式与实验结果基本吻合。在有覆盖层存在时,高阻覆盖层使q和m值减小,低阻覆盖使g和m相应增大。本文所得到的数值解规律,对电阻率法和激发极化法的实际找矿均有一定指导意义。
In this paper, the finite element method is used to calculate the anomalous anomalies of the mid-lift device in a two-dimensional upright polarization plate. Emphatically studied: the influence of plate-shaped body conductivity and cross-sectional geometry changes on the abnormality of the anomalies and the influence of the change of the conductivity of the covering layer on the anomalies of the anomalies, ) Chord cutting distance (m) Seeking plate-shaped body depth (h) of the numerical relationship. The numerical results show that: in the past, it was considered that “the use of IP (Excitation Polarization) method to find the orebodies in the high resistance rocks is easier than the search for the orebodies in the low resistance rocks” Not applicable. In terms of the size of the anomalies of the anomalies, the high-resistance overburden is favorable for the search of blind orebodies that occur in the lower part of the ore body, whereas it is unfavorable under low-resistance overburden conditions. Numerical calculations of plate-shaped bodies ρs, ηs Abnormal section curve half-value between the chord q chord cutting distance m Seeking the approximate formula of the top of the trigger body and the experimental results are basically consistent. In the presence of a coating, the high resistance coating reduces the values of q and m, and the low resistance coating causes a corresponding increase in g and m. The numerical solution law obtained in this paper is of guiding significance to the resistivity method and the actual prospecting of the induced polarization method.