RUAN Yongfen,ZHANG Qian,WU Long,et al.Study on Key Control Measures of Shield End in Lacustrine Sedimentary Soft Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):807-817.
RUAN Yongfen,ZHANG Qian,WU Long,et al.Study on Key Control Measures of Shield End in Lacustrine Sedimentary Soft Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):807-817. DOI: 10.13409/j.cnki.jdpme.20211103003.
Study on Key Control Measures of Shield End in Lacustrine Sedimentary Soft Soil
Lacustrine sedimentary soft soil distributes widely in Kunming area, and its engineering properties are extremely special. In this site, the risk of shield construction is very high, which is easy to cause instability of the shield end and the disaster of water and sand gushing. Therefore, it has become an urgent problem to explore the key control measures for the construction of the shield end in soft soil sites. An empirical analysis method is used to analyze the end reinforcement process, and the orthogonal test is introduced to explore the reinforcement range, so as to obtain an applicable optimal calculation model. Therefore, the application suggestions of each process, the ranking of sensitivity of end stability and the theoretical solution of reinforcement range are given. In view of the great risk of water and sand gushing in the existing portal water sealing and stop system, a new permanent water sealing and stop system is proposed in this paper. This system consists of three sealing components and two active measures. The research conclusion and water stop system are applied to the end of Huibao section of Kunming Metro Line 5. Midas Gts and logarithmic spiral sliding calculation model are used to simulate and calculate the stability of the end soil. Calculated displacement contour and safety factors are consistent with the field measurement, achieving a unification of end reinforcement theoretical solution and engineering solution. From the construction site, the application effect of the new water stop system is very ideal, which effectively ensures the safety of shield entering and leaving the tunnel, and can provide a reference for the design and construction of similar shield projects.
Mao B H , Jiang F , Liu Q , et al . City orbit traffic [M]. Beijing : Science Press , 2001 . (in Chinese)
王禹适 . 地铁工程盾构法施工风险管理研究 [D]. 北京 : 北京交通大学 , 2021 .
Wang Y S . Study on risk management of shield tunnel construction in metro engineering [D]. Beijing : Beijing Jiaotong University , 2021 . (in Chinese)
Li W M , Li Z M , Ren H , et al . Soil settlements and surrounding structure failure mechanism due to shield tunneling in metro construction [J]. Journal of Disaster Prevention and Mitigation Engineering , 2018 , 38 ( 3 ): 472 - 479 . (in Chinese)
Wang T M , Dai Z R . Application on ground reinforcement method of launching shaft for shield tunnel [J]. Journal of Railway Engineering Society , 2014 , 31 ( 8 ): 90 - 95,100 . (in Chinese)
Ruan Y F , Wei D Y , Yang J , et al . Determination of soil mechanics parameters based on Baye smethod and posterior distribution limit [J]. Chinese Journal of Geotechnical Engineering , 2019 , 42 ( 3 ): 438 - 446 . (in Chinese)
Ruan Y F , Wei D Y , Gao J , et al . K-means cluster analysis of soft soil parameters of plateau sedimentary [J]. Journal of Kunming University of Scienceand Technology(Natural Sciences) , 2020 , 45 ( 1 ): 85 - 91 . (in Chinese)
Jiang Y S , Wang C H , Jiang H , et al . Shield launching and arriving theoretial study and engineering practice on end rinforcement [M]. Beijing : People's Communica-tions Publishing House , 2011 : 56 - 185 . (in Chinese)
Wu L , Ruan Y F , Li F P , et al . Key control measures of subway shield tunnel construction in peat soil [J]. Construction Technology , 2019 , 48 ( 17 ): 76 - 80 . (in . Chinese)
Ding W T , Liu K Q , Wang X , et al . Reinforcement optimization of starting stratum of earth-pressure balance shield [J]. Journal of South China University of Technology(Natural Science Edition) , 2017 , 45 ( 5 ): 105 - 112 . (in Chinese)
Jiang Y S , Yang Z Y , Jiang H , et al . Study on reasonable strata improvement scopes for EPB shield driving at its start and arrival [J]. Tunnel Construction , 2009 , 29 ( 3 ): 263 - 266 . (in Chinese)
Xin Z X , Wang J A , Ma H T , et al . Study on reasonable range of initial prereinforcement for shield tunneling [J]. Chinese Journalof Underground Space and Engineering , 2007 , 18 ( 3 ): 513 - 518 . (in Chinese)
Song K Z , Wang M S , Sun M . Limit equilibrium analysis of soils stabilityat shallow tunnel end upon shield excavation [J]. Chinese Journal of Rock Mechanics and Engineering , 2015 , 34 ( 2 ): 407 - 413 . (in Chinese)
Cao C Y , Shi C H , Peng L M . Study on the longitudinal soil reinforcing scope for shield tunnelling breakthrough [J]. Chinese Journal of Underground Space and Engineering , 2016 , 12 ( 1 ): 119 - 125 . (in Chinese)
Chen R D , Pang K , Liu M G , et al . The invention relates to a shield tunnel orifice gasbag sealing device and a constructionmethod : CN202110798550.2 [P]. 2021-10-01 . (in Chinese)
Peng Y Y , Yang G L , Hu M , et al . The utility model relates to a small diameter earth pressure balance shield construction tunnel mouth water sealing device : 202020537948.1 [P]. 2021-02-26 . (in Chinese)
Li D Y , Wang H , Wang T . Analysis of soil reinforcement for the starting and arriving of shield machine in metro construction [J]. Journal of Railway Engineering Society , 2006 , 18 ( 1 ): 87 - 90 . (in Chinese)
Yin Y L , Yu H L , Zhou X Y , et al . Tribological properties of serpentine lubricant additives evaluated by orthogonal tests method [J]. Journal of Materials Engineering , 2020 , 48 ( 7 ): 146 - 153 . (in Chinese)
Li J J , Liang R W . Research on compression strength and modulus of deformation of cemented soil [J]. Rock and Soil Mechanics , 2009 , 30 ( 2 ): 473 - 477 . (in Chinese)