钻孔电磁波法在岩溶勘察中的应用实例

Application of Borehole Electromagnetic Wave method to prospecting for karst

灰岩地区，建筑场地的岩溶勘察是个重要课题，也是工程界的一大难题。溶洞与灰岩之间存在明显的高频电性差异，为应用钻孔电磁波法提供了良好的地球物理前提。通过广州地区的应用实例说明，本方法不仅可以定性划分岩溶发育区和非发育区，而且还可以半定量地求出隐伏溶洞的空间分布以及钻孔揭露溶洞的延伸范围。

The prospection of karst is a major topic in karat terrain and construction site and it is also a difficult issue in the field of engineering. Eyident difference of high frequency electricity is existing between karst cave and limestone, which provides a very good prerequisite of geophysics for the use of borehole electromagneticwave method. As indicated by the results after application in Guangzhou, this method can classify qualitatively the developmental area and the undevelopmental area of karst. It can also get semiquantitatively the spatial distribution of hidden karst caves and the mange of caves.