地质雷达在地铁基坑底隐伏岩溶探测中的应用

Application of Ground Penetrating Radar in the Survey of Hidden Karst for Subway Foundation Pit

地铁车站的建设不仅要保证施工过程中的安全,而且要保障长期运营中的安全,因此在可溶岩区基坑底部的隐伏岩溶是地铁工程需重点考虑的特殊地质问题。本文以武汉地铁二号线一期工程洪山广场车站基坑底部隐伏岩溶的地质雷达探测为例,阐述了地质雷达的工作原理、技术特点及工作方法,并根据雷达探测结论,采用地质钻探进行了验证,实例结果表明,地质雷达技术能够满足地铁车站深基坑底部岩溶探测的要求,准确度较高、速度快、效果好,是一种有效的技术手段,值得在基坑底部不良地质体探测中推广使用。

Geological conditions of subway foundation pit bottom should be taken care of to guarantee the safety of con- struction and operation of subway in karst area. It has shown that geology method should be given the first place together with other auxiliary methods considering the features of subway construction. This paper described principle, technology character of GPR and practical working Method and using an application of the successful detection of the karst in a foundation pit of Wuhan metro Line 2 as example, confirms the effectiveness and feasibility of the method in the exploration of hidden karst in founda- tion pit. The technique is worthy of wide application with further improvement.