基于地质雷达的北山地下实验室花岗岩岩体断裂探测试验

Georadar-Based Testing of Granite Rock Mass Fractures at the Beishan Underground Research Laboratory

摘要: 为寻找适用于北山地下实验室场址花岗岩岩体断裂的地球物理探测方法，在地下实验室斜坡道及平巷道开展了地质雷达方法试验。通过数据采集，精细化处理，解译获得了斜坡道K720-820段30米以浅的断裂分布以及−280平巷道15米以浅的断裂分布以及干扰异常。结果表明，地质雷达对花岗岩深部地质环境地球物理探测效果较好，揭示了地下实验室巷道周围一定空间范围内的断裂构造空间展布特征，为场址精细化三维地质建模提供关键数据支撑。但是受天线主频率及现场施工限制，未进行50 MHz天线试验，对构造深部发展方向探测效果不够理想。

Abstract: To find suitable geophysical exploration methods for detecting fractures in the granite rock mass at the Beishan Underground Research Laboratory site, ground-penetrating radar (GPR) trials were conducted in the ramp and drift tunnels. Through data acquisition, refined processing, and interpretation, the fracture distributions within 30 meters depth along the K720-820 section of the ramp and within 15 meters depth in the −280 m drift, along with interference anomalies, were obtained. The results indicate that GPR is effective for geophysical exploration in the deep granite geological environment, revealing the spatial distribution characteristics of fracture structures around the tunnel areas and providing key data support for refined 3D geological modeling. However, due to limitations such as antenna main frequency and on-site construction conditions, 50 MHz antenna tests were not conducted, and the detection effect for the deep development direction of structures was not ideal.