电磁波CT技术在岩溶勘查和注浆检测方面的应用

Application of Electromagnetic Wave CT to Karst Exploration and Grouting Detection

电磁波CT技术是工程勘查中的一种常用方法,利用电磁波CT技术进行探测,其成果清晰、直观,能够清楚地反映出地下不同地质体的空间分布。安徽某地进行道路拓宽改造,部分路基下伏基岩岩溶发育,前期进行了大量的钻孔勘探。本次勘查利用已有钻孔,采用电磁波CT法对注浆前后的测区进行探测,然后对检测结果进行处理与解释,查明了注浆前测区内溶洞的大小、形状和空间分布。并根据注浆前、注浆后电磁波CT成果的对比得出,注浆后视吸收系数整体低于注浆前,注浆效果明显。结果表明,电磁波CT法在岩溶勘查和注浆检测方面应用效果良好,是一种非常有效的物探手段。

Electromagnetic wave CT technique is a common method in engineering survey.By using electromagnetic wave CT technology to detect,the results are clear and intuitive and it can clearly reflect the spatial distribution of different underground geological bodies.In a place of Anhui province,road widening and transformation are conducted and karst of underlying bedrock in part of the subgrade is developed.Therefore,a large number of borehole prospecting tasks need to be carried out in the early stage.This survey uses the existing drilling and employs the electromagnetic wave CT method to detect the test area before and after grouting.Then,the results are processed and explained and find out the size,shape and spatial distribution before grouting in the detected area.According to thecomparison between the results of electromagnetic wave CT before and after grouting,the apparent absorption coefficient after grouting is lower than that before grouting.The results show that the electromagnetic wave CT method is a very effective method for geophysical exploration in karst exploration and grouting detection.