地质雷达在工程地质调查中的初步应用

Application of geologic radar to engineering geology investigation

地质雷达作为一种新技术，在工程地质调查中具有分辨率高，信息量丰富，能直观地反映地下介质的构造特征等优点。文章简述了地质雷达探测的原理和３个应用实例，从初步应用成果可以看出，在南水北调中线工程渠线覆盖层探测中，地质雷达可有效分辨粘土与砂层以及这些层中的薄层与透镜体分布，对地下水位也有明显反映。在三峡工程花岗岩风化分带探测和建基面风化槽探测中，地质雷达剖面清晰地反映出基岩内部的不均匀风化特征。

The geologic radar, as a new technique for engineering geology investigation, has many advantages, such as high resolution, abundant information amount, capability of visually reflecting structural characteristics of underground medium. In this paper, the concept for geologic radar to detect the ground strata and its three applied examples are briefly presented. As viewed from detected results of overburden layers along the canal line of Middle Route Project of South to North Water Transfer, the geologic radar can effectively resolve clay and sand strata as well as existence of thin layers and lens shaped objects in them, and also obviously reflect the underground water table. For zoning of weathered granite in TGP damsite and detection of weathered trench in TGP dam foundation, the geologic radar sections distinctly reflect nonuniformly weathered characteristics of foundation rock.