盾构法开挖地铁联络通道对地表沉降的影响研究

Effects of Surface Subsidence in Excavation of Metro Crossing Passage Tunnel by Shield Machine

世界首条盾构法联络通道一宁波地铁联络通道已经将盾构法挖掘地铁联络通道变为现实,但对于盾构法联络通道挖掘对地表沉降的影响还缺乏足够的认识和积累。以宁波地铁3号线某区间的地铁联络通道开挖为例,对盾构法联络通道施工过程进行了试验测试及CAE(Computer Aided Engineering)仿真,并成功地完成了施工过程中各个工况地表沉降仿真与测试的标定分析,得到了沉降幅值在各工况下的变化规律,指出盾构地铁联络通道施工过程中需要关注的危险工况,据此形成了一套真实、可靠、先进的仿真流程,可为联络通道后续沉降监控及其它联络通道施工过程的沉降预测提供支持。

The excavation of the metro crossing passage tunnel by the shield method is turned into reality at the Ningbo metro subway tunnel,that is the world first metro crossing passage. However,for the effects of the excavation by the shield machine on the surface subsidence,rare studies can be found and the deep understanding of the mechanism is needed. Taking the excavation of the metro crossing passage tunnel in a certain section of the Ningbo Metro Line 3 as an example,this paper conducts the field test and CAE (Computer Aided Engineering) simulation on the construction process of the shield method. The calibration analysis between test data and CAE results of the surface subsidence during the construction process is performed. The variation law of the subsidence amplitude under various working conditions is obtained,and the dangerous conditions that need to be paid attention to during the construction of the metro crossing passage tunnel by the shield machine are pointed out. Consequently,an authentic,reliable and advanced simulation process is established,and thus the surface subsidence caused by the metro crossing passage tunnel and other similar constructions can be well monitored and predicted.