Abstract：
Double shield TBM has been widely used in urban rail transit projects for its advantages of safe, effi? cient and fast construction, and a reasonable routing for TBM passing through the station is also one of the key technologies for TBM tunnel construction. Based on the equipment models and station-crossing methods commonly used for double shield TBM construction in Qingdao, this paper conducts a thorough research and analysis on the different TBM station-crossing methods, the relationship between routes and construction clearances, furthermore assesses the construction risks for tunnels with small clear distance. The conclusions are drawn as follows: (1) the engineering cost performance is the highest when priority is given to the method of whole TBM machine curved passing through the station, and the crossing route is two section of reverse curves tangent to each other, with equal radius and the radius of R=350 m; (2) when the TBM passing through the station installed with the secondary lining, the construction clearance of the mined approach tunnel is the same, and the deflection route length increases with the increase of the deflection radius; (3) when the TBM passing through the station installed with the initial support, the length and construction clearance of the mined approach tunnel decrease with the increase of the sidewall thickness, and when the sidewall thickness is close to 1.15 m, priority should be given to the method of whole TBM machine straight passing through the station; (4) taking the common medium-weathered and slightly weathered strata in TBM tunnelling as examples, the plastic zone of the rock pillar sandwiched by the mined approach tunnels is not yet connected, and the horizontal convergence is small, so the construction risk of tunnels with small clear distance can be controlled, and the construction safety can be achieved; (5) it is recommended that priority be given to the method of TBM passing through the station install with the secondary lining, with strict control of the posture and direction of the TBM in the reverse curve section, timely and reasonable correction of the deflection, and ensuring the safety margin reserved between the cutter head and the structure.
GAO Xin WANG Wenjuan LI Qingfei FENG Shijie WU Qi
.Research on the Routing Scheme of a Double Shield TBM Passing through the Metro Station[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(5): 56-64
2021, Vol. 58 