电磁波CT技术在溶洞勘察中的应用效果分析

溶洞、裂隙发育是桩基工程施工中的主要安全隐患之一,因此,溶洞勘察在工程中显得尤为重要。传统的溶洞勘察方法以电阻率法为主,但是受限于该法的勘探深度,同时其勘探结果也不能确定溶洞的边界,钻探也只是在极小的范围确定岩层的溶蚀状况。电磁波层析成像(简称电磁波CT)是一种发展中的地球物理勘探技术,它以电磁波在不同介质中传播特性不同作为勘探理论基础。本文以电磁波CT技术在某特大桥桥基岩溶勘察的结果,结合井中录像以及钻孔资料来证明该技术在溶洞勘察方面具有显著的效果。

Analysis of Application Effect in Cavity Exploration by Electromagnetic Computerized Tomography

The exploration of solution cavity is essential in the construction of pile foundation that results from the solution cavity and crack. Traditional method of solution cavity exploration is mainly based on resistivity method. However, depth is limited and boundary of solution cavity can't be obtained in this method. Additionally, drilling method can only explorer the karst cavity in an infinitesimal area. Electromagnetic Wave Computer Tomography (EWCT) is a developing geophysical method based on characteristics of spreading of electromagnetic wave in different medium. This paper mainly aims to substantiate the effect of karst cavity exploration with the method of EWCT. Result obtained by EWCT has been compared with kinescope and drilling data in an exploration of karst cavity in a huge bridge foundation. The result shows that EWCT is an effective method for karst cavity exploration.