井地电法地表电场分布规律模型试验研究  

Experimental study on surface electric field distribution model of borehole-to-surface electrical method

作　　者：吕守航 杜立志[1] 姚仁 王杰[1] 常高奇 

机构地区：[1]吉林大学建设工程学院,长春130026 [2]中交第一航务工程勘察设计院有限公司,天津300222

出　　处：《世界地质》2017年第3期995-1000,共6页World Geology

基　　金：土体复电阻率特征参数与导热系数相关性研究(41402246)资助

摘　　要：为研究井地电法在确定异常体边界时电场的分布规律,笔者对室内水槽固定位置的低阻体(铜板)直接供电,并对充电低阻体形成的电场在地表的电位分布特征进行观测。研究不同方向电位分布特征,及进行线性拟合建立电位梯度曲线,分析异常体不同方向上的电位梯度变化规律,确定该低阻体的边界特征。模拟实验表明,电位梯度曲线在异常体的边界会出现明显的拐点,与电位分布图的对比表明,电位梯度曲线在异常体边界的变化可以作为识别异常体边界的标志。In order to study the electric field distribution of borehole-to-surface method in determining the boundary of the anomalous body,the authors supplied electricity directly through low resistance object（ copper plate） which was placed at the fixed position of the water sink in the lab,and monitored the surface electric potential distribution characteristic of the electric field formed by the charged low resistance object. The characteristics of potential distribution in different directions were studied,the potential gradient curve were established by linear fitting. The variation of potential gradient in different directions of anomalous body were also analyzed, and the boundary of the low resistance body was determined. The simulation results show that the potential gradient curve has obvious inflection point on the boundary of the anomalous body. By comparing with the potential distribution,the change of the potential gradient curve at the boundary of the anomalous body can be used as a marker to identify the boundary of the anomalous body.

关 键 词：低阻 异常体 电位值 线性拟合 井地电法 

分 类 号：P631.8[天文地球—地质矿产勘探]