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隧道建设(中英文) ›› 2020, Vol. 40 ›› Issue (4): 496-503.DOI: 10.3973/j.issn.2096-4498.2020.04.005

• 研究与探索 • 上一篇    下一篇

低真空隧道结构力学行为及密封性能试验研究

吕乾乾1, 2, 孙振川1, 2, 周建军1, 2, 杨振兴1, 2, 陈瑞祥1, 2   

  1. (1. 盾构及掘进技术国家重点实验室, 河南 郑州 450001; 2. 中铁隧道局集团有限公司, 广东 广州 511458)
  • 收稿日期:2019-10-08 出版日期:2020-04-20 发布日期:2020-04-30
  • 作者简介:吕乾乾 (1988—),女,河南济源人,2013 年毕业于天津大学,结构工程专业,硕士,工程师,主要从事盾构及掘进技术研究工作。 E-mail: 674936740@ qq. com。
  • 基金资助:

    中铁隧道集团科技创新计划(隧研合2019-08, 隧研合2017-05); 中铁股份有限公司科技研究开发计划(2020-重点-27)

Experimental Study on Mechanical Behavior and Sealing Performance of Low Vacuum Tunnel Structure

LYU Qianqian1, 2, SUN Zhenchuan1, 2, ZHOU Jianjun1, 2, YANG Zhenxing1, 2, CHEN Ruixiang1, 2   

  1. (1. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou 450001, Henan, China; 2. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China)
  • Received:2019-10-08 Online:2020-04-20 Published:2020-04-30

摘要:

为探讨隧道结构在低真空复杂环境下的适用性,在搭建低真空管道系统试验平台的基础上,对隧道管道结构在低真空复杂工况下的力学行为及密封性能进行物理模拟试验研究,得出以下结论: 1)抽真空使管壁整体受压,且以环向受力为主,外壁应力在 1 MPa 以内,受管内抽真空气流影响,内壁应变大于外壁且分布不均匀; 2)管壁所受轴力为60~200 kN,弯矩最大值为1. 4 kN·m, 处于大偏心受压状态; 3)管内温度越高,漏气速率越快,试验系统的密封薄弱点在两侧预埋钢板与管道混凝土结合处; 4)低真空引起的结构受力变形整体较小,为保证密封性能,真空管道运输结构采用现有的隧道拼装式管片结构时建议加整体内衬。

关键词: 低真空, 隧道结构, 物理模拟, 密封性能, 力学行为

Abstract:

The physical simulation experiment for mechanical behavior and sealing performance of tunnel structure under low vacuum condition is conducted base on the low vacuum pipe system platform, so as to explore the feasibility of tunnel structure in complex low vacuum environment. Some conclusions are drawn as follows: (1) The whole pipe wall is pressured due to annular force by vacuuming; the stress of outer wall is below 1 MPa; the stress of inner wall is greater than that of outer wall and is uneven due to the influence of inner airflow caused by vacuuming. (2) The axial force of pipe is between 60 kN and 200 kN, and the maximum bending moment is 1. 4 kN·m, which indicates that the pipe is in a state of large eccentric compression. (3) The higher the temperature in the pipe, the larger the leakage rate; the weak sealing points locate at the junction of embedded steel plate and concrete on both sides of pipe. (4) The structural deformation induced by low vacuum is small; in order to guarantee the sealing performance, the integral lining is recommended when the assembled tunnel segment structure is used in low vacuum pipe structure.

Key words: low vacuum, tunnel structure, physical simulation, sealing performance, mechanical behavior

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