贵州山区大功率电法勘探中改善接地电阻的方法技术  

THE METHOD FOR IMPROVING THE GROUNDING RESISTIVITY IN LARGE-POWER ELECTRICAL PROSPECTING WITHIN MOUNTAIN AREAS OF GUIZHOU PROVINCE

作　　者：张应文 何建华 代迪 彭洪军 马强 代璨怡 

机构地区：[1]贵州省地质矿产局102地质大队,贵州遵义563003

出　　处：《物探与化探》2013年第3期517-520,共4页Geophysical and Geochemical Exploration

摘　　要：在贵州裸露的基岩山区,大部分岩石电阻率都很高,开展大功率电法工作最大的困难是无法将电极打入岩石,电极接地十分困难或根本无法布置电极。为有效改善接地条件,实现大功率电法勘探,在总结传统的改善接地电阻方法的基础之上,总结出裸露基岩地区改善电阻接地条件的方法技术,即积水淹没片状电极法。使用该法工作时,在供电点建造封闭的储水空间,存储一定高度的水,将金属片状电极淹没于积水中。该方法具有接地面积大、接触条件好、接地电阻值稳定的特点,经在实际工作中多次应用,接地电阻改善明显,实现了大功率供电勘探,野外数据质量大幅度提高,取得了很好的应用效果。In the exposed bedrock mountain areas of Guizhou Province, most rocks have very high resistivity, and the greatest difficult met by the large-power electrical prospecting lies in the impossibility of inserting the electrode into the rock, hence the electrode grounding is very difficult or even impossible. In order to improve the grounding conditions and realize large-power electric prospecting, the authors, based on summarizing the traditional method for improving grounding resistivity, have summed up the method and technol- ogy for improving grounding conditions in exposed bedrock areas. The method is called ＂water log drowned sheet electrode method＂. In this method, the closed water-storage space is built at the electric supply station, a certain height of water is stored in the water-storage space, and the metallic sheet electrode is drowned in the water log, thus improving the grounding resistivity. This method is character- ized by large grounding area, good contact condition and stable grounding resistivity. Practice shows that this method can obviously im- prove grounding resistivity, realize large-power current supply exploration, considerably raise the quality of field data, and achieve good application result.

关 键 词：积水淹没片状电极法 大功率电法勘探 接地电阻 金属电极 裸露基岩 

分 类 号：P631[天文地球—地质矿产勘探]