天然源面波技术在南京地铁工程中的应用

Application of Natural Source Surface Wave Technology in Nanjing Metro Project

在南京地铁某工程中,应用天然源面波技术对岩溶和采空区进行了研究。岩溶区域数据采集采用ESPAC台阵,边长采用3m,6m,12 m,最大测深约65 m;采空区数据采集采用ESPAC台阵,边长采用4m,8m,16 m,最大测深约103 m。通过天然源面波技术采集的横波波速,划分岩土层层序,找到低速异常区,并与钻探资料进行对比。对比分析发现,天然源面波技术可以反映出岩溶和采空区,与钻孔资料具有一定的对应性,但对于一些规模较小的溶洞,探测结果仍存在一些误差。

In a project of Nanjing metro,natural source surface wave technology was used to study karst and mined-out areas.The data collection of karst area adopts ESPAC array,the side length is 3m,6m,12 m,and the maximum sounding depth is about 65 m;the data collection of goaf area adopts ESPAC array,the side length is 4m,8m,16 m,and the maximum sounding depth is about 103 m.The shear wave velocity collected by the natural source surface wave technology is used to divide the rock and soil layer sequence,find low-velocity anomaly area,and compare it with the drilling data.Comparative analysis found that the natural source surface wave technology can reflect karst and mined-out areas,and has a certain correspondence with borehole data,but for some small-scale caverns,there are still some errors in the detection results.