Abstract When a shield tunnel crossing under an operating railway line is constructed in the pebble-boulder stra? tum, safety protection measures shall be taken to reduce the impact on the normal operation of the railway. Taking as an example the running tunnel project from Yushuzhuang Station to Wanpingcheng Station in Line 16 of the Beijing Subway crossing Fengtai West Railway Marshalling Station, the difficulties in construction were systematically analyzed, the measures for the shield tunnel crossing the railway marshalling station (e.g. cutter optimization and modification, muck conditioning scheme, and setting of tunneling parameters) were described, the key points and technological processes of protective measures for the railway (e.g. grouting reinforcement and rail fastening) were introduced, FLAC 3D was used to simulate the full process of shield tunnel crossing, and the effectiveness and necessity of engineering protection measures were analyzed. The calculation results showed that the grouting reinforcement that was carried out for the soil layer above which the shield tunnel crossed the regional railway could effectively block the upward transfer of shield construction disturbances, and after reinforcement, the vertical surface deformation was significantly reduced, and the railway line deformation was controlled within the safety range, which veri? fied the validity of engineering protection measures.
Abstract：
When a shield tunnel crossing under an operating railway line is constructed in the pebble-boulder stra? tum, safety protection measures shall be taken to reduce the impact on the normal operation of the railway. Taking as an example the running tunnel project from Yushuzhuang Station to Wanpingcheng Station in Line 16 of the Beijing Subway crossing Fengtai West Railway Marshalling Station, the difficulties in construction were systematically analyzed, the measures for the shield tunnel crossing the railway marshalling station (e.g. cutter optimization and modification, muck conditioning scheme, and setting of tunneling parameters) were described, the key points and technological processes of protective measures for the railway (e.g. grouting reinforcement and rail fastening) were introduced, FLAC 3D was used to simulate the full process of shield tunnel crossing, and the effectiveness and necessity of engineering protection measures were analyzed. The calculation results showed that the grouting reinforcement that was carried out for the soil layer above which the shield tunnel crossed the regional railway could effectively block the upward transfer of shield construction disturbances, and after reinforcement, the vertical surface deformation was significantly reduced, and the railway line deformation was controlled within the safety range, which veri? fied the validity of engineering protection measures.
LIU Zhaowei
.Research on the Technology for the Shield Tunnel Crossing the Railway Marshalling Station in the Pebble-boulder Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(4): 226-233
2022, Vol. 59 