期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 111, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2021.103857
关键词
Slurry TBM tunnel; Tail grouting; Coarse-grained soil; Surface settlement; FEA
资金
- National Natural Science Foundation of China [51808150, 41877227, 52020105002]
- Natural Science Foundation of Guangdong Province [2018A030313132]
- China Railway Tunnel Group
This paper investigates the impact of TBM tail-grouting on surface settlement in coarse-grained soils, demonstrating its influence through a shield-driven tunnel project and FEA modeling. Findings show that different tail-grouting parameters, particularly asymmetric tail-grouting, significantly affect ground settlement, with ground deformation directly correlated to tail-grouting pressure rather than grouting volume ratio.
This paper examines the role of TBM tail-grouting on surface settlement of coarse-grained soils in urban area. The influence of tail grouting on the ground surface settlement is firstly demonstrated through a challenging shield-driven tunnel project in Beijing City, China. FEA modelling incorporating the excavation sequence and tail grouting details is then set up to support the field observations, based on which the influences of different TBM tail-grouting parameters on ground settlement are investigated, especially the asymmetric tail-grouting in which one of the two grouting openings at the upper part of the shield tail is malfunctioned. It is shown that the grouting volume variation is inconsistent with the development of the grouting pressure, and the ground deformation in coarse-grained soils is directly related to the tail-grouting pressure rather than the grouting volume ratio. Asymmetric tail-grouting will result in notable offset of the maximum surface settlement point in settlement trough from tunnel centerline which correlates exponentially with the parameter ? defined to represent the asymmetry ratio of the grouting pressure.
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