土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (5): 597-601.

• 专题论述 • 上一篇    下一篇

传力垫片对管片后端开裂影响的数值模拟研究

郭志利   

  1. （中铁三局集团第二工程有限公司，石家庄 050001）
  • 收稿日期:2019-11-17 修回日期:2019-11-27 出版日期:2020-10-20 发布日期:2020-11-02
  • 作者简介:郭志利（1983-），男，工程师，研究方向为铁路、高速公路、市政工程管理工作。

Numerical Simulation on the Segment Cracking Induced by Backend Gasket

GUO Zhili   

  1. (The 2nd Construction Co. Ltd., China Railway No. 3 Engineering Group Co., Shijiazhuang 050001)
  • Received:2019-11-17 Revised:2019-11-27 Online:2020-10-20 Published:2020-11-02

摘要： 盾构施工期间的管片裂缝对衬砌结构的安全性及耐久性影响较大。结合福州地铁某区间隧道衬砌管片开裂的现场调查，在MIDAS数值平台上设计了均压、偏压推进2种工况，对衬砌管片的受力状态进行精细化三维数值模拟。重点关注管片中拉应力分布情况，分析当垫片分布不均匀或垫片脱空等不利因素存在时，管片后端裂缝的分布模式。当均压顶推且垫片失效时，管片仍处于安全状态；偏压顶推时，后端裂缝发展的危险区域均出现在垫片失效区域。

关键词: 地铁隧道, 盾构施工, 管片裂缝, 数值模拟, 传力垫片

Abstract: Segment cracks during the shielded tunnel excavation have a large impact on the safety and durability of the lining structure. Based on the field investigation for the segment cracking in shielded tunnel excavation of Fuzhou Metro, the numerical simulations for shielded even/eccentric jacking conditions are carried out by using the MIDAS platform. The distribution of the tensile stress with the segment and the segment backend cracking are well analyzed under the unfavorable conditions such as the uneven distribution or the voiding of backend gaskets. Under the even jacking condition, the segment remains in safety even with some unfavorable condition of gasket. Under the eccentric jacking condition, the segment cracking may occur on the backend area where lacking gaskets.


Key words: Subway Tunnel, Shielded Construction, Segment Cracks, Numerical Simulation, Gasket

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