井下垂直接地极散流特性的影响因素研究

Research on Influencing Factors of Dispersion Characteristics of Vertical Grounding Electrodes in Underground

为了研究影响接地极散流场分布的因素,以钢管接地极为研究对象,以某矿简化的地层结构为基础建立模型,并用COMSOL软件仿真对比分析了接地极长度、外径及埋深对散流场的影响。结果显示散流场的电场强度和电流密度均存在端部效应,除端部处外,电场强度分布曲线较为平缓,低电阻率岩层的电流密度较大;岩层分布一定时,通过增大接地极的长度和外径或改变接地极的埋深来减小接地电阻;接地极外径的变化对地表电位分布几乎无影响。

Taking the steel pipe grounding electrode as the research object,and establishing a model based on the simplified stratum structure of a mine is to analyze the factors affecting the distribution of the grounding electrode dispersion flow field.The COMSOL software is used to simulate and compare the influence of the length,outer diameter and buried depth of the grounding electrode on the dispersed flow field.The results show that the electric field intensity and current density of the diffuse current field have end effects.Except for the ends,the electric field intensity distribution curve is relatively flat,and the current density of the low resistivity rock formation is relatively large.When the rock formation is distributed,the grounding resistance can be reduced by increasing the length and outer diameter of the grounding electrode or changing the buried depth of the grounding electrode.The change in the outer diameter of the grounding electrode has almost no effect on the surface potential distribution.