The Influence of Subway Shield Tunnel under the Existing Railway on the Track Settlement and the Technology of Pile Raft Reinforcement
For the project of Subway Shield Tunnel under the Beijing-Chengde Railway River in the water-rich sand Line 6,Beijing Subway area,a dynamic tunneling model based on small strain soil hardening stiffness constitutive(HSS)is constructed by using Plaxis 3D,an advanced finite element analysis software.The paper aims to analyze in depth the key of the pile-raft reinforcement scheme to the shield construction process and its impact on the Beijing-Chengde Railway River Delta.It is pointed out that the longitudinal settlement of the tunnel will exceed the yellow warning value by 4 mm and the maximum settlement will reach 5.2 mm without any protective measures.However,the maximum settlement gets significantly reduced to 1.5 mm when the pile-raft reinforcement scheme is implemented,thus confirming the significant effect of the reinforcement scheme in ensuring driving safety in Beijing-Chengde Railway.
shield tunnelexisting railwaytrack settlementfinite element analysispiled raft reinforcement
万方数据
维普
