浅埋暗挖法隧道侧穿地铁高架桥变形规律

Deformation Law of a Subway Viaduct BridgeAffected by Traversing Shallow Mining Method Tunnel

浅埋暗挖法以其经济、灵活的特点在地铁建设中得到了较好的应用。然而,浅埋暗挖法施工时对土体扰动较大,容易引起地表沉降,导致邻近的地铁高架桥变形,影响运营安全。依托北京某地铁出入口通道侧穿地铁高架桥工程,采用有限元软件ANSYS建立三维数值模型,模拟浅埋暗挖法隧道的施工过程,分析新建隧道施工对既有高架桥结构的影响程度,讨论隧道内注浆加固措施的作用及其效果。

The shallow excavation method has been well applied in subway construction due to its economic and flexible characteristics.However,the shallow excavation method causes significant disturbance to the soil during construction,which can easily lead to surface settlement and deformation of adjacent subway viaducts,affecting operational safety.Relying on the side crossing subway viaduct project of a certain subway access passage in Beijing,a three-dimensional numerical model was established using finite element software ANSYS to simulate the construction process of shallow excavation method tunnel,analyzed the impact of new tunnel construction on the existing subway viaduct structure,and discussed the role and effectiveness of grouting and reinforcement measures in the tunnel.