砂岩及其坡积物结构面的地质雷达图像解译——以超强地面耦合50MHz雷达天线探测为例

Using ground-penetrating radar image to interpret the structural interface in a sandstone and slope wash area——Taking to use the rough terrain 50MHz antenna of GPR antenna for surveying for example

白鹤滩地区下覆地层具有含水量高、透水性差、强度低等特征,可能会在工程中引发地质灾害等问题。利用超强地面耦合50MHz雷达天线,采用剖面法研究砂岩及坡积物区域地层结构,获取了砂岩及坡积物之间不同结构面的波形特征,并且在雷达图像上客观地反映砂岩及坡积物地区地层变化情况。针对探测区实际情况优选地质雷达探测及具体应用,并对图像资料进行精细的解译,确定了地层结构面的纵向变化情况,清晰地反映出基岩内部特征,也对地质雷达高分辨率野外数据采集、分析有着重要的参考价值。

The low layer of the sandstone in the Baihetan district exhibits large water content, difficult water permeability and low pressure intensity which may cause geological disasters in the future projects. The formation structure of the sandstone and the slope wash district is studied using the rough terrain GPR with 50 MHz frequency antenna by arranging GPR profiles. The characteristics of the image of the structural interface between the sandstone and the slope wash are obtained. In this way, the radar images can objectively reflect the aherative formation structure. Based on the above information, the paper focuses on the priority adoption of the GPR measurement and the practical application of the GPR according to the particular condition of the prospecting area. The precise interpretations of the images are expounded as well, which help to determine the vertical changes of the formation structure interfaces in the prospecting area and also clearly reflect the characteristics of lithologic variation. Furthermore, this produces a great referential value for the high resolution GPR data collection and analysis in an open air.