本文主要讲述了城市地铁工程施工中沉降技术的应用,以及沉降发生后的应急措施.并对发生沉降事故的原因进行分析和总结.随着地铁的发展我国的地铁建设已步人快速发展阶段。然而,在地铁工程的施工中,地表沉降事故发生的概率很高。以某地铁一号线的建设为例,在施工工期内,地面沉降事故占总事故的25%。事故发生地位于某市区繁华地段,对工程周围的建筑物以及地下管线产生了一定的影响,同时也影响了工程的进度增加了工程的费用。所以,不论从工程进度、费用的控制方面考虑还是从工程质量安全方面来考虑,都要对地表沉降控制有足够的重视,从各个方面着手,来控制沉降的发生。 This paper mainly discusses the application of settlement technology in urban subway construction and the emergency measures after the settlement, and analyzes and summarizes the reasons for the settlement accident.With the rapid development of subway, the subway construction in our country has been rapidly developed. However, in the construction of subway projects, the probability of surface subsidence accidents is high. Taking the construction of a subway line as an example, during the construction period, land subsidence accidents account for 25% of the total accidents. The accident occurred in the bustling urban area, which affected the buildings and underground pipelines around the project. It also affected the progress of the project and increased the cost of the project. Therefore, no matter from the engineering progress, cost control considerations or from engineering aspects of quality and safety considerations, should have adequate attention to surface subsidence control, from all aspects, to control the occurrence of subsidence.