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Shanghai Yangtze River Tunnel Stability against Uplift during Tail Void Grouting
During shield tunneling, as segments exit from the shield, an annular void occurs between the shield tail inner side and the lining outer side. The void must be back-filled with grout to provide a compact fill and avoid ground surface subsidence. However, flotation of the tunnel within the fluid grout and soft soil can also cause tunnel uplift; this paper studies the relationship between early strength of single grout subsidence and Shanghai Yangtze River tunnel stability upon shield tunneling. Influence of the rate of tunneling on tunnel stability against uplift is also studied; a longitudinal and transverse calculation model is established to investigate tunnel uplift in relation to grout strength increase. From the analysis, safety criteria for the structural lining are verified. Finally, relevant construction technological measures are suggested against tunnel uplift for shield tunneling.
Shanghai Yangtze River Tunnel Stability against Uplift during Tail Void Grouting
During shield tunneling, as segments exit from the shield, an annular void occurs between the shield tail inner side and the lining outer side. The void must be back-filled with grout to provide a compact fill and avoid ground surface subsidence. However, flotation of the tunnel within the fluid grout and soft soil can also cause tunnel uplift; this paper studies the relationship between early strength of single grout subsidence and Shanghai Yangtze River tunnel stability upon shield tunneling. Influence of the rate of tunneling on tunnel stability against uplift is also studied; a longitudinal and transverse calculation model is established to investigate tunnel uplift in relation to grout strength increase. From the analysis, safety criteria for the structural lining are verified. Finally, relevant construction technological measures are suggested against tunnel uplift for shield tunneling.
Shanghai Yangtze River Tunnel Stability against Uplift during Tail Void Grouting
Yang, Fangqin (author) / Lin, Jiaxiang (author) / Yuan, Yong (author)
International Conference on Pipelines and Trenchless Technology (ICPTT) 2009 ; 2009 ; Shanghai, China
ICPTT 2009 ; 1403-1412
2009-09-15
Conference paper
Electronic Resource
English
Grouting , Oil pipelines , Yangtze River , Trenchless technology , Installation , Sewer pipes , China , Water pipelines , Tunnels , Seismic effects , Uplifting , Design , Corrosion , Rehabilitation , Gas pipelines , Pipelines
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