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导洞开挖方案的选择在地铁车站洞桩法的施工中越来越受到关注。依托北京地铁6号线朝阳门车站工程,对洞桩法施工的导洞进洞方式、开挖顺序等方案进行优化。采用有限元法,建立三维“地层-结构”相互作用模型,模拟了不同方案下的导洞开挖过程,获得了施工横通道的变形与应力、地表的变形以及邻近管线的变形等数据。数值分析结果表明:分离施工通道方式可以有效地控制施工通道的变形和应力;相比于先开挖下导洞,先开挖上导洞可以更好地控制地表沉降槽的形状和管线的变形;导洞开挖宜采用跳挖错距的方法,开挖错开距离不应小于10 m。
The choice of guide tunnel excavation program in the subway station building more and more attention. Relying on the Beijing Subway Line 6 Chaoyangmen Station project, the construction of the hole pillars cave approach, excavation sequence optimization program. By using the finite element method, a three-dimensional model of “stratum-structure” interaction is established to simulate the tunneling process under different schemes and get the deformation and stress of horizontal cross-section of the tunnel, the deformation of the ground surface and the deformation of the adjacent pipeline. The results of numerical analysis show that the separation of construction tunnels can effectively control the deformation and stress of construction tunnels. Compared with the excavation of the pilot tunnels, excavation of the upper pilot tunnel can better control the shape of the surface sedimentation tanks and the deformation of the pipeline ; Guide the tunnel excavation should adopt the method of jumping and digging the wrong distance, excavation should not be less than 10 m away from the distance.