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黄昌富, 龙文, 宋棋龙, 李栋, 苏栋, 陈湘生. 加固范围对软土浅埋超大直径盾构掘进地表沉降的影响[J]. 岩土工程学报, 2021, 43(S2): 76-79. DOI: 10.11779/CJGE2021S2018
引用本文: 黄昌富, 龙文, 宋棋龙, 李栋, 苏栋, 陈湘生. 加固范围对软土浅埋超大直径盾构掘进地表沉降的影响[J]. 岩土工程学报, 2021, 43(S2): 76-79. DOI: 10.11779/CJGE2021S2018
HUANG Chang-fu, LONG Wen, SONG Qi-long, LI Dong, SU Dong, CHEN Xiang-sheng. Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(S2): 76-79. DOI: 10.11779/CJGE2021S2018
Citation: HUANG Chang-fu, LONG Wen, SONG Qi-long, LI Dong, SU Dong, CHEN Xiang-sheng. Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(S2): 76-79. DOI: 10.11779/CJGE2021S2018

加固范围对软土浅埋超大直径盾构掘进地表沉降的影响

Influence of reinforcement range on ground settlement of shallow-buried super-large-diameter shield tunneling in soft soils

  • 摘要: 盾构法是软土地区地下隧道开挖的主要施工方法,但软土浅埋超大直径盾构掘进对地表沉降的影响有待进一步研究。以珠海横琴杧洲隧道工程为背景,利用有限元软件开展了加固范围对软土浅埋超大直径盾构掘进地表沉降影响的研究。结果表明:当t=0.00D时,地表最大沉降约50 mm,当t=0.20D时,地表最大沉降约8 mm,相比t=0.00D最大沉降减小约84%,软土地层经加固处理后可有效减少隧道开挖对地表沉降的影响;同时着重分析了盾构隧道不同施工阶段的横向地表沉降变化规律,其中盾构机通过监测横断面期间对地表扰动程度最大,累计沉降占比约50%~60%。

     

    Abstract: The shield method is the main construction method for the excavation of underground tunnels in soft soil areas, but the impact of shallow-buried super-large-diameter shield tunneling in soft soils on ground settlement needs to be further studied. Based on the case of Weizhou Tunnel in Hengqin of Zhuhai the influence of the reinforcement range on the surface settlement of shallow-buried super-large diameter shield tunneling in soft soils is studied by using the finite element software. The results show that when t=0.00D, the maximum surface settlement is about 50 mm, when t=0.20D, the maximum surface settlement is about 8 mm, which is about 84% less than the maximum settlement at t=0.00D%, and the soft soil layer can effectively reduce the impact of tunnel excavation on surface settlement after reinforcement. Meanwhile, the law of lateral surface settlement changes during the different construction stages of shield tunnels is analyzed, and the shield tunneling machine disturbs the ground surface during the monitoring of the cross section. The degree is the largest, and the cumulative subsidence accounts for about 50% to 60%.

     

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