井间电磁波CT技术在溶洞探测中的应用

肇庆大桥位于西江流域，是连接肇庆和珠江三角洲地区主要干线上的大桥。５个主桥墩位于溶洞和断层破碎带上，地质情况非常复杂。为了探明墩位下方的溶洞分布状况，每个墩布置了６－８个ＣＴ探测钻孔，每两个钻孔之间进行电磁波ＣＴ探测，结合地质墩位下方溶洞的分布状况。实际钻桩结果表明电磁波ＣＴ探测结果很有成铲。

Prospecting corroded cavities using cross-section electromagnetic tomographic technique between boreholes

The cross section electromagnetic tomographic technique (CEMT) had been used to explore the corroded cavities under the five main piers of Zhaoqing Bridge, which have been built, and is located on the Xijiang river in which the carbonate rock are well developed. We had drilled 6 or 8 boreholes, using the CEMT technique, combined with the geological data, to confirm the distribution of the cavities area under each pier. The final results show that this method is work well in carbonate rock region.