Application of GPR in the hole survey of the subway project

摘要

GPR (Ground penetrating radar) is one kind of the detection technologies with rapid, non-destruction, uninterrupted detection and high-resolution. GPR can be applied to detect underground holes and loose soil layer and the other baneful anomalies, and therefore is widely applied to hole survey of the subway project in recent years. In this paper, on the base of briefly describing engineering geological background between F station and L station of a subway project in Beijing, arrangement method of GPR survey line was put forward in the construction area of shield method. The distribution range and its characteristic of the hole anomalies were confirmed by analyzing and spade exploring partial anomaly. The results showed that three obvious anomalies were detected in the area between F station and L station, and seriously loose soil layer was the cause of No.1 and No.3 anomalies, and hole was the cause of No.2 anomaly. Thereby the anomalies of loose soil layer and hole could be detected accurately by the GPR technology, and then basic data of underground holes could be obtained. On the base of analyzing these data, effective measures could be adopted to avoid the hidden danger, then the safety of subway construction and surrounding environment of the subway project could be ensured.