基于地质雷达的地下空洞探测

城市道路、地铁施工过程中,由于施工扰动、水土流失、土壤疏松都会产生地下空洞。空洞是道路安全运营破坏力最大的病害诱因,直接导致路面开裂和塌陷。近年来,城市道路大型塌陷频频发生,社会影响恶劣,因此对于城市公路、地铁进行地下空洞探测迫在眉睫。而探地雷达可以在不直接接触被测物体的情况下,主动发射电磁波信号并接收回波信号成像,通过对雷达图像进行分析,获取空洞的准确位置和大小。本文以某城市在建地铁为例,在地铁线路的两个车站及车站区间内布设探测路线,并采用地质雷达进行探测。内业处理结果显示,测量区域内共有5处地下异常,与现场钻孔验证结果完全一致。实验证明将地质雷达用于城市地铁地下空洞探测完全可行。

During the construction of urban roads and subways,it could cause subterranean cavity because of construction disturbance,soil and water loss,loose soil.The cavity is the most destructive factor of road safety operate,it will lead to pavement cracking and collapse directly.In recent years,large-scale collapse of urban roads has occurred frequently,and social impacts are harsh.Therefore,underground cavity detection for urban roads and subways is extremely urgent.Ground Penetrating Radar(GPR)can actively emit electromagnetic wave signals and receive echo signal imaging without directly contacting the measured object.By analyzing radar images,the exact location and size of the cavity can be obtained.In this paper,taking a subway in a city as an example,the detection route is set up between two stations and the station sections of the subway line,then using geological radar to detect subterranean cavity.The results of the internal processing show that there are 5 underground anomalies in the survey area,which are completely consistent with the field drilling verification results.The experiment proves that it is completely feasible to use geological radar for subterranean cavity detection in urban subways.