跨孔电磁层析技术对桥墩溶岩洞的探测(英文)

The Cross Well Electromagnetic Tomography Technique in Exploration of Corrode Cavity on pile pier Foundation

肇庆大桥位于西江流域，是连接肇庆和珠江三角洲地区的主要干线上的大桥。5个主桥墩位于溶洞和断层破碎带上，以往常用的单桩单孔的方法只能查明10cm直径垂直下方的溶洞分布情况，这种常规的方法难于查明整个桥墩位下方的溶洞分布情况，而且一孔之见难于达到技术要求。近年来发展起来的CT成像技术，正好可以弥补这方面的不足。本次电磁波CT探测法在肇庆大桥5个主桥墩的溶洞探测结果说明，这种方法是可行的，溶洞探测结果还经过最后的钻桩验证。

ZhaoQing Bridge, which is a main line connecting the ZhaoQing City and pearl Delta area, is situated on the Xi Jiang river catchment area in Guang Dong province. Their main pile piers are all situated on corroded limestone & marble cavity or above the rupture fragmentation. The one borel hole for one pile on every pier, a tradiational method for collecting geological data in Bridge foundation, is hardly possible to find out the cativities in corroded limestone and marble basic rock. The Cross Well Electromagnetic Tomography Technique is just possible for making up this shortage . We had used this technique in five main pile piers of ZhaoQing Bridge, by laying out crisscross prospecting profiles in each pile pier, constructing three dimension cavities distribution map in underground corroded limestone & marble rock through these crisscross profiles, figure out the cavities size & extension in difference direction .