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大直径水下盾构隧道开挖流固耦合效应研究

王金安, 周家兴, 李飞 ,辛振省   

  • 出版日期:2020-09-28 发布日期:2020-09-28

Study on fluid-solid coupling effect of large diameter underwater shield tunnel excavation

WANG Jin'an, ZHOU Jiaxing, LI Fei ,XING Zhenxing   

  • Online:2020-09-28 Published:2020-09-28

摘要: 隧道盾构施工穿越江海的的力学行为非常复杂,其周边岩土体流固耦合效应对施工各个阶段的影响仍是目前研究的重点。以南京地铁越江盾构隧道工程为依托,建立该区域流固耦合效应力学分析模型。采用VOF-流体体积函数方法追踪流体动态运动水面,并结合数值计算,对工程施工各个阶段进行了计算分析,相关位移、沉降、渗流计算结果与现场监测数据相吻合。研究结果表明:盾构施工通过河床的过程中,会出现河床反拱现象。河底的破坏呈现出很强的规律性,即从河流断面看,破坏区围绕河床基本呈弧形分布,为此可以通过加强拱腰上方土层的支护来保证隧道施工的安全。

关键词: 盾构施工, 流固耦合, VOF-流体体积函数, 河床反拱,

Abstract: The mechanical behavior of tunnel shield crossing rivers and seas is very complicated,and the fluid-solid interaction in surrounding rock mass on various stages during the construction is still the focus of research.Aiming at a section of Nanjing subway shield tunnel project,a fluid-solid coupling mechanical analysis model was established.We use numerical calculation method and the VOF to track dynamic water surface of the fluid.The calculation results such as deformation,settlement,seepage are in agreement with the field monitoring data.The results show that when shield construction is crossing the river,an inverted arch phenomenon will appear in the river bed;the damage at the bottom of the river showed a strong regularity,namely,the damage zone around the riverbed basically is an arc.The support design for soil above the arch waist should be strengthened to ensure the safety of tunnel construction

Key words: shield construction, fluid-solid coupling, VOF-Fluid Volume Function, inverted arch of river bed;