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隧道建设(中英文) ›› 2019, Vol. 39 ›› Issue (11): 1781-.DOI: 10.3973/j.issn.2096-4498.2019.11.005

• 研究与探索 • 上一篇    下一篇

盾构隧道内堆载引起的隧道转动和错台变形计算

魏纲1, 2, 齐永洁1, 吴华君3   

  1. (1. 安徽理工大学土木建筑学院, 安徽 淮南 232001; 2. 浙江大学城市学院土木工程系,浙江 杭州 310015; 3. 义乌工商职业技术学院, 浙江 义乌 322000)
  • 收稿日期:2019-07-15 出版日期:2019-11-20 发布日期:2020-04-04
  • 作者简介:魏纲(1977—),男,浙江杭州人,2006年毕业于浙江大学,岩土工程专业,博士,教授,主要从事地下隧道与周边环境相互影响及风险评估与控制等方面的研究与教学工作。E-mail: weig@zucc.edu.cn。
  • 基金资助:

    浙江省公益技术应用研究计划项目(LGF19E080002)

Calculation of Rotation and Segment Ring Dislocation Deformation Caused by Surcharge in Shield Tunnels

WEI Gang1, 2, QI Yongjie1, WU Huajun3   

  1. (1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan  232001, Anhui, China; 2. Department of Civil Engineering, Zhejiang University City College,  Hangzhou 310015, Zhejiang, China; 3. Yiwu Industrial & Commercial College, Yiwu 322000, Zhejiang, China)
  • Received:2019-07-15 Online:2019-11-20 Published:2020-04-04

摘要:

盾构隧道内堆载可以有效抑制隧道的上浮变形。为研究隧道内堆载对隧道纵向沉降及变形的影响规律,采用综合考虑管片环间错台和转动变形效应的协同变形模型,推导计算堆载引起的隧道附加荷载,通过最小势能原理求解隧道纵向沉降、环间剪切力、错台量和转角,并研究不同堆载大小、堆载长度、土质条件对隧道纵向沉降及位移的影响规律。研究结果表明: 1)采用该计算方法得到的结果与实测值和数值模拟结果比较吻合,说明方法可靠; 2)堆载引起的隧道附加应力和沉降沿隧道纵向呈正态分布,堆载中心处最大,且与堆载大小近似成正比; 3)隧道环间错台量、转角及剪切力三者变化规律相同,在堆载中心处近似为0,但在中心两侧急剧增大; 4)随着堆载长度的增加,隧道沉降量相应增大,但增大速度逐渐减缓; 5)不同土质条件对隧道堆载引起的隧道沉降量及沉降范围均有较大影响。

关键词: 盾构隧道, 隧道内堆载, 隧道变形, 环间错台变形, 环间转动变形

Abstract:

Surcharge in shield tunnels can effectively restrain the uplift deformation of tunnels. In order to study the influence of surcharge on the longitudinal settlement and deformation of tunnel, the cooperative deformation model, comprehensively considering the rotation and dislocation effect of shield tunnel segment ring, is adopted. And then the tunnel additional load caused by surcharge is deduced and calculated. Meanwhile, the longitudinal settlement of the tunnel, the shear force, the amount of dislocation and rotation angle among the rings are derived based on the principle of minimum potential energy. Finally, the influences of different surcharge sizes, surcharge ranges and soil conditions on longitudinal settlement and displacement are studied. The results show that: (1) The calculated results by the method mentioned above are in good agreement with the measured and simulated ones, which proves the reliability of the method. (2) The additional stress and settlement of the tunnel caused by surcharge are normally distributed along the longitudinal direction; the maximum additional stress and settlement appear in the center of surcharge and are approximately proportional to the size of surcharge. (3) The variation rules of the shear force and the amount of dislocation and rotation angle among the rings are the same, which is approximately 0 in the center of the surcharge, but increases sharply on both sides of the center. (4) With the increase of surcharge range, the settlement of tunnel increases correspondingly, but the growth rate gradually slows down. (5) Different soil conditions have great influence on the settlement amount and settlement range of tunnel caused by surcharge.

Key words: shield tunnel, surcharge in tunnel, tunnel deformation, segment ring dislocation deformation, segment ring rotational deformation

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