地质雷达法在贵阳市地铁喀斯特隧道中的应用

The Application of Geological Radar Method in Karst Tunnel of Guiyang Subway

喀斯特是一种不良地质现象,喀斯特隧道施工易发生涌水、突泥、局部坍塌等工程事故。文章基于地质雷达超前地质预报技术,结合贵阳市地铁2号线北京西路站-三桥站喀斯特隧道工程实例,对地质雷达的工作原理、地质雷达探测数据采集与处理技术进行了研究,并分析具体的地质雷达波形图和探测结果。研究结果表明:地质雷达法适用于喀斯特发育不良地质的超前预报和预测,其地质雷达波形图具有频率高低变化急剧并伴同相轴连续,且以中低频率分布为主的特征。研究结果可为类似工程实际提供借鉴。

Karst is an adverse geological phenomenon.Karst tunnel construction is prone to engineering accidents such as water gushing,mud bursting and local collapse.Based on the advanced geological prediction technology of geological radar,combined with the karst tunnel project of Beijing West Road Station-Sanqiao Station on Guiyang Metro Line 2,this paper studies the working principle of geological radar,the data acquisition and processing technology of geological radar detection,and analyzes the specific geological radar waveform diagram and detection results.The research results show that the geological radar method is suitable for the advanced prediction of poorly developed karst geology.The geological radar waveform diagram has the characteristics of sharp frequency change and continuous phase axis,and is mainly distributed at medium and low frequencies.The research results can provide reference for similar engineering practice.