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Frozen curtain characteristics during excavation of submerged shallow tunnel using Freeze-Sealing Pipe-Roof method

Research in Cold and Arid Regions 2022年第4期14卷 267-273页

作者： Ye Niu ZeQun Hong Jun Zhang Lei Han China Railway Siyuan Survey and Design Group Co. Ltd.WuhanHubei430056China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouJiangsu221116China CCCC Second Highway Consultants Co. Ltd.WuhanHubei430056China Department of Geotechnical Engineering Tongji UniversityShanghai200092China

The Freeze-Sealing Pipe-Roof(FSPR)method,which has been applied for the first time in the Gongbei Tunnel of the Hong Kong-Zhuhai-Macao Bridge,is a new approach of tunnel pre-support that allows flexible adjustment of freeze tube arrangement and can be adapted to different environmental *** the FSPR method is used to construct shallow burial submerged tunnels,the frozen wall to hold back groundwater during excavation will be weakened by air and water flows inside and outside the tunnel,and its waterproof performance needs to be further *** this paper,a two-dimensional numerical model of the temperature field considering excavation and moving water boundary is established based on the preliminary design scheme and in-situ conditions and is used to analyze the variation in frozen curtain properties with various active freezing times during *** results show that excavation has a weakening effect on both sides of the frozen wall,with a greater effect on the inner side,and a positive temperature appears in the local area inside the jacked *** concrete fill in the jacked pipe obviously improves the freezing efficiency,and the tunnel excavation after 60 days of active freezing in the interval filling mode can ensure that the frozen soil thickness at the thinnest segment exceeds 2 m,i.e.,the design *** practice,the active freezing time can be extended appropriately to reduce the influence of river water flow above the *** study serves as a technical reference for the design and implementation of similar projects.

关键词： Freeze-sealing pipe-roof method Submerged tunnel soil excavation Temperature field Frozen wall thickness

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