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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2017, Vol. 36 ›› Issue (10): 19-25.DOI: 10.3969/j.issn.1674-0696.2017.10.04

• 桥梁与隧道工程 • 上一篇    下一篇

软土盾构隧道基底加固对长期沉降的影响分析

龚彦峰1，2，王爱武3，周坤2，刘新根4，陈瑜嘉4   

  1. (1.中铁第四勘察设计院集团有限公司，湖北 武汉 430063；2.水下隧道技术湖北省工程实验室，湖北 武汉 430063； 3.广东珠三角城际轨道交通有限公司，广东 广州 510230；4.上海同岩土木工程科技股份有限公司，上海 200092)
  • 收稿日期:2016-06-30 修回日期:2016-08-30 出版日期:2017-10-27 发布日期:2017-10-27
  • 作者简介:龚彦峰(1969—)，男，河南鹿邑人，博士，教授级高级工程师，主要从事隧道及地下工程的设计及研究工作。E-mail: tsygyf@126.com。 通信作者：王爱武(1967—)，男，湖南攸县人，硕士，高级工程师，主要从事土木工程技术研究及管理工作。E-mail: wawwam@163.com。

Influence of Base Reinforcement of Shield Tunnel on the Long-Term Settlement in Soft Soil Stratum

GONG Yanfeng1，2，WANG Aiwu3，ZHOU Kun2，LIU Xin’gen4，CHEN Yujia4   

  1. (1.China Railway SIYUAN Survey & Design Group Co.Ltd.，Wuhan 430063，Hubei，P.R.China; 2.Engineering Laboratory of Underwater Tunnel Technology of Hubei Province，Wuhan 430063，Hubei，P.R.China; 3. Guangdong Pearl River Delta Intercity Railway Co.Ltd., Guangzhou 510230, Guangdong, P.R.China; 4.Shanghai Tongyan Civil Engineering Technology Co.Ltd.，Shanghai 200092，P.R.China)
  • Received:2016-06-30 Revised:2016-08-30 Online:2017-10-27 Published:2017-10-27

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摘要： 在富水软弱地层中，如何预测及控制地层扰动引起的长期固结沉降一直是盾构隧道施工面临的重要问题之一。基于FEM-FDM水土完全耦合理论，利 用同济曙光三维有限元软件，分析了珠海某隧道软土区段局部加固对盾构施工引起的土体工后长期固结沉降的影响规律。数值计算结果表明：地层及隧道 拱顶长期沉降槽随埋深增大逐渐变深变窄；盾构隧道基底加固分别使地表及隧道拱顶的最大沉降量减小34.2%和27%，且使二者更快趋于稳定，但对隧道结 构变形的影响并不明显；加固会使隧道竖向应力有所增大，但不会改变其沿隧道轴向的分布规律；有基底加固时隧道拱腰处的超孔隙水压力消散更快，使 得固结沉降更快趋于稳定。

关键词: 隧道工程, 软弱地层, 固结沉降, 水土耦合, 盾构施工

Abstract: In water-rich soft soil stratum，how to predict and control the long term consolidation settlement induced by ground disturbance in the shield tunnel construction is one of the important problems.Based on soil-water fully coupling theory in the FEM- FDM scheme，the influence rule of the local reinforcement of the soft soil section of one tunnel on the long-term post consolidation settlement of soil caused by shield tunneling construction was analyzed by using GeoFBA3D software.The numerical calculation results indicate that the long-term settlement trough of the soft stratum and the tunnel vault becomes deeper and narrower with the increase of the buried depth.The maximum settlements of the ground surface and tunnel vault caused by the base reinforcement in shield tunneling construction are reduced by 34.2% and 27% respectively，and both of them tend to be more stable，but the influence on the deformation of the tunnel structure is not obvious.The reinforcement will make the vertical stress of tunnel increase，but it does not alter its axial distribution rule along the tunnel; furthermore，the excess pore water pressure of tunnel arch with the base reinforcement dissipates faster，which makes the consolidation settlement tend to be stable faster.

Key words: tunnel engineering, soft stratum, consolidation settlement, soil-water coupling, shield construction

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