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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。
Therefore, the concealed karst at the bottom of the foundation pit in the soluble rock area is a special geological problem to be considered in the subway project. Taking the detection of hidden karst at the bottom of foundation pit of Hongshan Square Station of Wuhan Metro Line 2 Phase I Project as an example, the working principle, technical characteristics and working methods of the GPR are described. According to the radar detection conclusion, geological drilling is carried out The results show that the GPR technology can meet the requirement of karst detection at the bottom of deep foundation pit of subway station with high accuracy, high speed and good effect. It is an effective technique that is worth to be probed at the bottom of pit In the promotion and use.