三台阶七步法下穿既有铁路的沉降控制技术研究

Research on Settlement Control Technology of Tunnels Beneath Existing Railroad With Three-bench Seven-step Method

山岭隧道施工必然会对地面既有铁路线造成一定影响,为了控制风险需选择合理的施工方法减小围岩变形,通过有限元软件模拟,对比不同工法的位移场从而选择最合理的工法,并结合现场实践总结出采用三台阶七步法施工沉降控制技术的要点。

Construction of moutain tunnels must have some impact on the overhead existing railway,and in order to control the risk we need to choose a reasonable construction method to reduce the deformation of surrounding rock.By finite element software simulation,we selected the most reasonable construction method by comparing the displacement field of different construction methods,and summed up the settlement control points of Three-bench Seven-step Method according tome construction in practice.