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Study on Settlement Patterns of the CFG Pile-reinforced High-speed Railway
Subgrade Caused by Parallel Shield Tunnelling
（1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061；2. Sinohydro Bureau 8 Co., Ltd.,
Changsha 410004; 3. Key Laboratory for Resilient Infrastructures of Coastal Cities (Shenzhen University), MOE, Shenzhen 518061;
4. Shenzhen Key Laboratory of Green, Efficient and Intelligent Construction of Underground Metro Station, Shenzhen 518061)
Abstract Focusing on the shield tunnelling of the Xi′an Metro Line 1 beneath the Xuzhou-Lanzhou High-speed
Railway, this study performs a statistical analysis of the monitored track settlement data before and after the tunnelling. A refined three-dimensional finite element model of parallel shield tunnelling crossing under a high-speed railway subgrade is established using Plaxis-3D software. The numerical model′s validity is verified through comparison with field measurements. Based on the model, the settlement transfer mechanism of the track-subgradeCFG pile-soil-shield tunnel system induced by shield tunnelling is analyzed, and the stress and deformation behaviors of CFG piles are investigated. Research results indicate that when the shield tunnel completely passes through the railway subgrade, a 50 m long surface settlement trough forms, with a double-peak distribution curve. The bottom of CFG piles becomes loose after shield tunnelling beneath the railway subgrade, resulting in an effective pile length of 75% of the original length. The range of loosening in CFG piles in the horizontal and longitudinal sections of this project is determined as (-12.6 m, 12.6 m) by studying CFG piles at different positions.
Abstract：
Focusing on the shield tunnelling of the Xi′an Metro Line 1 beneath the Xuzhou-Lanzhou High-speed
Railway, this study performs a statistical analysis of the monitored track settlement data before and after the tunnelling. A refined three-dimensional finite element model of parallel shield tunnelling crossing under a high-speed railway subgrade is established using Plaxis-3D software. The numerical model′s validity is verified through comparison with field measurements. Based on the model, the settlement transfer mechanism of the track-subgradeCFG pile-soil-shield tunnel system induced by shield tunnelling is analyzed, and the stress and deformation behaviors of CFG piles are investigated. Research results indicate that when the shield tunnel completely passes through the railway subgrade, a 50 m long surface settlement trough forms, with a double-peak distribution curve. The bottom of CFG piles becomes loose after shield tunnelling beneath the railway subgrade, resulting in an effective pile length of 75% of the original length. The range of loosening in CFG piles in the horizontal and longitudinal sections of this project is determined as (-12.6 m, 12.6 m) by studying CFG piles at different positions.
WU Beiyu1 XIE Weiping2 LIN Xingtao1,
3,
4 GAO Chen2 SU Dong1 etc
.Study on Settlement Patterns of the CFG Pile-reinforced High-speed Railway
Subgrade Caused by Parallel Shield Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(6): 139-147
2024, Vol. 61 