Abstract
During the construction of subway shields, the problem of floating segments is particularly prominent in silty clay strata. The resulting segment problems, such as cross-platform, cracks, damage and leakage, cause great harm to the tunnel. Through field test, combined with mathematical theory and numerical simulation analysis, this paper studies the floating law of segments in water rich sandy silt and muddy clay layer, which provides a basis for analysing the control measures of segment floating, which can improve the safety of the project and save the project cost. The typical section of shield tunnel of Hangzhou Metro Line 7 is selected as the test section, and the segment floating law is deeply analysed through field test. By combining numerical simulation and theoretical research, the mechanism underlying the effects of the grouting slurry properties, the main physical parameters of the soil and the distance of the segment from the shield tail on segment floating is discussed. The results show that shield segments floating in muddy clay strata can be divided into three typical stages: rapid change, buffering and stability. In the first stage, segment up-floating develops rapidly, accounting for 70–90% of the total up-floating within 15 hours after leaving the shield tail. In the second stage, buffer up-floating develops slowly, and the average up-floating amount accounts for 7.59% of the total amount of up-floating. In the third stage, segment up-floating gradually stops with the condensation and hardening of the slurry. The results show that there is a negative correlation between the slurry condensation rate and the number of floating segments, a negative correlation between the segment distance from the shield tail and the number of floating segments, and a positive correlation between the elastic modulus of the soil and the number of floating segments. The multifactor calculation model is proven to have good adaptability in silty soft soil layers.
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References
An J-S, Kang K-N, Choi J-Y, Sung W-S, Suy V Song K-I (2020) Tunnel back analysis based on differential evolution using stress and displacement. Advances in Civil Engineering 2020:1–10, DOI: https://doi.org/10.1155/2020/8156573
Chen R, Zhu B, Ni W (2016) Uplift tests on full-scale pipe segment in lumpy soft clay backfill. Canadian Geotechnical Journal 53:578–588, DOI: https://doi.org/10.1139/cgj-2015-0084
Cheng JW-C, Ni J, Shen S-L (2017) Experimental and analytical modeling of shield segment under cyclic loading. International Journal of Geomechanics 17:1–18, DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0000810
Dong I-J, Kim J, Chang W-K, Park I (2017) Study on flexible segment efficiency for seismic performance improvement of subsea tunnel. Journal of Korean Tunnelling and Underground Space Association 19:503–515, DOI: https://doi.org/10.9711/KTAJ.2017.19.3.503
Dong L, Yang Z, Wang Z, Ding Y, Qi W (2020) Study on internal force of tunnel segment by considering the influence of joints. Advances in Materials Science and Engineering 2020:1–13, DOI: https://doi.org/10.1155/2020/1020732
Geng DX, Hu YC, Jiang YL, Wang N, Hu WT (2021) Modified calculation model for segment floating in slurry shield tunnel. Journal of Performance of Constructed Facilities 35(5), DOI: https://doi.org/10.1061/(asce)cf.1943-5509.0001632
Heo S-M, Jung H, Lee S-W (2018) Waterproofing performance evaluation according to each waterproofing material due to segment construction error. Journal of Korean Tunnelling and Underground Space Association 20:1023–1037, DOI: https://doi.org/10.9711/KTAJ.2018.20.6.1023
Huang H-W, Zhang D-M (2016) Resilience analysis of shield tunnel lining under extreme surcharge: Characterization and field application. Tunnelling and Underground Space Technology 51:301–312, DOI: https://doi.org/10.1016/j.tust.2015.10.044
Kim H-M, Kim H-S, Shim K-M, Ahn S-Y (2017) A study on the factors influencing the segment lining design solved by beam-spring model in the shield tunnel. Journal of Korean Tunnelling and Underground Space Association 19:179–194, DOI: https://doi.org/10.9711/KTAJ.2017.19.2.179
Lee G-P, Chang S-H (2019) Stability analysis of shield tunnel segment lining by field measurement and full scale bending test. Journal of Korean Tunnelling and Underground Space Association 21:611–620, DOI: https://doi.org/10.9711/KTAJ.2019.21.5.611
Lei M, Lin D, Shi C, Ma J, Yang W (2018) A structural calculation model of shield tunnel segment: Heterogeneous equivalent beam model. Advances in Civil Engineering 2018:1–16, DOI: https://doi.org/10.1155/2018/9637838
Liu L, Gao S, Xu P (2018) Numerical analysis of adjacent construction of Metro orthogonal and parallel shield tunnel, China. Modern Tunnelling Technology 55:791–795, DOI: https://doi.org/10.13807/j.cnki.mtt.2018.S2.102
Liu X, Zhang C, Zhang C, Yuan Y (2017) Ultimate load-carrying capacity of the longitudinal joints in segmental tunnel linings. Structural Concrete 18:693–709, DOI: https://doi.org/10.1002/suco.201600070
Mei Y, Zhang XY, Nong XZ, Fu LY (2021) Experimental study of the comprehensive technology of grouting and suspension under an operating railway in the cobble stratum. Transportation Geotechnics 100612:62–89, DOI: https://doi.org/10.1016/j.trgeo.2021.100612
Mirsayapov IT, Koroleva IV (2015) Fourteenth international symposium on soil rheology “prospective trends in theoretical and practical development in rheology and soil mechanics”. Soil Mechanics and Foundation Engineering 51:315–316, DOI: https://doi.org/10.1007/s11204-015-9296-x
Nabipour M, Rezapour S, Mohajeri SH (2020) A parametric study on friction-loss in water conveyance tunnels considering misalignment of precast concrete segments. Tunnelling and Underground Space Technology 96:103221, DOI: https://doi.org/10.1016/j.tust.2019.103221
Tan Z, Li Z, Tang W, Chen X, Duan J (2020) Research on stress characteristics of segment structure during the construction of the large-diameter shield tunnel and cross-passage. Symmetry-Basel 12:1246, DOI: https://doi.org/10.3390/sym12081246
Wang X, Shi B, Wei G, Chen SE, Zhu H, Wang T (2018) Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors. Structural Control & Health Monitoring 25:e2056, DOI: https://doi.org/10.1002/stc.2056
Wang XY, Song QY, Gong H (2022) Research on deformation law of deep foundation pit of station in core region of saturated soft loess based on monitoring. Advances in Civil Engineering 7848152, DOI: https://doi.org/10.1155/2022/7848152
Xiao MQ, Sun WH, Han XY (2011) Research on segment floating of shield tunnel. Tunnel boring machine committee of tunnel and underground engineering branch of Chinese civil engineering society, October 13–16, Beijing, China
Yan ZG, Zhang Y, Shen Y, Zhu HH, Lu Y (2020) A multilayer thermo-elastic damage model for the bending deflection of the tunnel lining segment exposed to high temperatures. Tunnelling and Underground Space Technology 95:103142, DOI: https://doi.org/10.1016/j.tust.2019.103142
Yang Y, Zhou B, Xie X, Liu C (2018) Characteristics and causes of cracking and damage of shield tunnel segmented lining in construction stage — A case study in Shanghai soft soil. European Journal of Environmental and Civil Engineering 22:s213–s227, DOI: https://doi.org/10.1080/19648189.2017.1356243
Yuan BX, Li ZH, Chen YM, Ni H, Zhao ZQ, Chen WJ, Zhao J (2022) Mechanical and microstructural properties of recycling granite residual soil reinforced with glass fiber and liquid-modified polyvinyl alcohol polymer. Chemosphere 286:131652, DOI: https://doi.org/10.1016/j.chemosphere.2021.131652
Yuan BX, Li ZH, Zhao ZQ, Ni H, Su ZL, Li ZJ (2021) Experimental study of displacement field of layered soils surrounding laterally loaded pile based on transparent soil. Journal of Soils and Sediments 21(9):3072–3083, DOI: https://doi.org/10.1007/s11368-021-03004-y
Zhang J, Lin Y, Chen Y, Li X (2021) Deformation behavior of shield segment joint controlled by bolt and positioning tenon. Arabian Journal for Science and Engineering 11:110–131, DOI: https://doi.org/10.1007/s13369-021-05662-z
Zhao T, Liu W, Ye Z (2017) Effects of water inrush from tunnel excavation face on the deformation and mechanical performance of shield tunnel segment joints. Advances in Civil Engineering 2017:133–151, DOI: https://doi.org/10.1155/2017/5913640
Zheng G, Cui T, Cheng X, Diao Y, Zhang T, Sun J, Ge L (2017) Study of the collapse mechanism of shield tunnels due to the failure of segments in sandy ground. Engineering Failure Analysis 79:464–490, DOI: https://doi.org/10.1016/j.engfailanal.2017.04.030
Zhou Y, Wang Y, Ding L, Love PED (2018) Utilizing IFC for shield segment assembly in underground tunneling. Automation in Construction 93:178–191, DOI: https://doi.org/10.1016/j.autcon.2018.05.016
Zhu X, Bao T, Yu H, Zhao J (2020) Utilizing building information modelling and visual programming for segment design and composition. Journal of Computing in Civil Engineering 34:71–88, DOI: https://doi.org/10.1061/(ASCE)CP.1943-5487.0000903
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This study was supported by the National Natural Science Foundation of China (No. 51408463) and Key R&D Projects in Shaanxi Province (No. 2020SF-373).
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Mei, Y., Luo, Z., Jiang, H. et al. Study on the Floating Law of Metro Segments in Water-Rich Sandy Silt and Silty Clay Strata. KSCE J Civ Eng 26, 2979–2991 (2022). https://doi.org/10.1007/s12205-022-2139-1
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DOI: https://doi.org/10.1007/s12205-022-2139-1