微动剖面探测法在城市轨道交通勘察中的应用及效果:以广州地铁十号线为例

Application of the Microtremor Profile Method in Urban Rail Transit Survey:A Case Study along Subway Line 10 in Guangzhou

在城市轨道交通工程地球物理勘测中一直面临抗干扰和精准探测难题。以广州市轨道交通十号线寺右新马路段地下人防构筑物探测为例,介绍了二维微动剖面(2D microtremor profile,2DMTP)探测技术的方法理论及其在城市轨道交通工程勘察中的应用效果。通过与钻探成果的对比分析,提出了2DMTP在城市轨道交通勘测、设计不同阶段的使用建议。结果表明:微动剖面探测方法非常适用于城市复杂强干扰的工作环境,能为轨道交通勘察设计、施工安全提供重要的依据,对提高工程地质勘察精度,降低勘探成本与施工风险,缩短建设工期起到重要作用。

Conducting engineering survey in urban rail transit development is always a challenging task due to the heavy interfe-rences and the requirement of high accuracy.Based on the microtremor survey conducted in section of Shiyouxinma road of Guangzhou Metro Line 10 project,where the main objective was detected the underground civil air defense facility,the 2D microtremor profile(2DMTP)technique was introduced,including its theory,data acquisition,processing workflow and its application in geological investigation in urban rail transit development.By comparing the microtremor survey results with the borehole data,recommendations were made on the use of the 2DMTP technique during both planning and designing stage of the urban rail transit development.The results show that the 2DMTP technique is well suitable in complex urban environment where heavy interferences exist,and it can not only provide essential geological information for engineering design and construction safety in urban rail transit development,but also plays an important role in improving the accuracy of engineering survey,reducing exploration cost and construction risk,and shortening the construction period.