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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (S1): 240-247.DOI: 10.3973/j.issn.2096-4498.2023.S1.028

• 研究与探索 • 上一篇    下一篇

不均匀收敛模式在软岩隧道中的适用性研究

刘旭1 2 3, 吴红刚1 2 *, 关伟2 3, 孙浩2 4   

  1. 1. 贵州大学资源与环境工程学院, 贵州 贵阳 550025 2. 中铁西北科学研究院有限公司, 甘肃 兰州 730070; 3. 贵州大学 国土资源部喀斯特环境与地质灾害重点实验室, 贵州 贵阳 550025;4. 西南科技大学土木工程与建筑学院, 四川 绵阳 621010)

  • 出版日期:2023-07-31 发布日期:2023-08-28
  • 作者简介:刘旭(1998—),男,河北保定人,贵州大学资源与环境(地质工程)专业在读硕士,主要从事岩土与地基工程方面的研究工作。 Email: 1064577833@qq.com。*通信作者: 吴红刚, E-mail: 271462550@qq.com。

Applicability of Uneven Convergence Mode in Soft Rock Tunnels

LIU Xu1, 2, 3, WU Honggang1, 2, *, GUAN Wei2, 3, SUN Hao2, 4   

  1. (1. College of Resource and Environment Engineering, Guizhou University, Guiyang 550025, Guizhou, China; 2. Northwest Research Institute Co., Ltd. of CREC, Lanzhou 730070, Gansu, China; 3. Key Laboratory of Karst Environment and Geological Hazards, Ministry of Land and Resources, Guizhou University, Guiyang 550025, Guizhou, China; 4. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)

  • Online:2023-07-31 Published:2023-08-28

摘要: 为进一步对山区软岩隧道断面的收敛变形模式进行研究,以隧道断面拱顶沉降与拱腰水平收敛为研究对象,基于现有地铁盾构隧道不均匀收敛模式提出隧道断面拱顶沉降与拱腰水平收敛比值K对隧道断面变形进行参数化表达,基于K值将隧道断面收敛变形情况分为3种形态。结合西成铁路甘青隧道甘肃段2段不同埋深情况下隧道断面变形监测数据进行分析。结果表明: 1)通过K值的参数化分析,发现隧道断面的变形模式主要受隧道均匀收敛ε与隧道椭圆化δ的影响; 2)隧道埋深对于隧道开挖后断面收敛变形有一定的影响,在埋深较深的情况下隧道围岩相对稳定,隧道断面收敛变形量较小且在短时间内将趋于稳定; 3)通过甘青隧道实测数据发现,不均匀收敛模式与现有的经验参数适用于浅埋(埋深17.8~19.3 m)区域内的隧道断面,但是对于深埋(埋深48.5~49.3 m)区域内隧道断面的适用性不佳; 4)首次将源于地铁盾构隧道的断面不均匀收敛模式引入山岭隧道,由于山岭隧道施工的复杂性,目前对山岭隧道的K值仅进行了初步的适用性研究。

关键词: 软岩隧道, 不均匀收敛模式, 拱顶沉降, 水平收敛, 隧道椭圆化

Abstract: To further investigate the convergence deformation mode of soft rock tunnel section in mountainous area, a case study is conducted on the crown settlement and horizontal convergence of arch waist of a tunnel section, the ratio 〖WT5《TNR#I》〗KWT5《TNR》〗 of crown settlement and horizontal convergence of arch waist is proposed based on the existing uneven convergence mode of metro shield tunnel, so as to parameterize the deformation of tunnel crosssection. Additionally, three forms of convergence deformation of tunnel crosssection are proposed based on WT5《TNR#I》〗KWT5《TNR》〗 value. Finally, the monitoring data of tunnel crosssection deformation under different buried depths in Gansu section of the Ganqing tunnel on XiningChengdu highspeed railway are analyzed. The results show the following: (1) The parametric analysis of the WT5《TNR#I》〗KWT5《TNR》〗 value shows that the deformation mode of the tunnel crosssection is mainly affected by the tunnel uniform convergence WT5《TNR#I》〗〖QX(Y8〗ε〖QX)〗〖WT5《TNR》〗 and the tunnel ovalization WT5《TNR#I》〗〖QX(Y10〗δ〖QX)〗〖WT5《TNR》〗. (2) The buried depth of the tunnel has a certain influence on the convergence deformation of the tunnel crosssection after tunnel excavation. Because the surrounding rock of the tunnel is relatively stable under the condition of deep buried depth, the convergence deformation of the tunnel crosssection is small and tends to be stable in a short time. (3) The uneven convergence model and the existing empirical parameters are suitable for the tunnel crosssection in the shallow buried area (buried depth of 17.8~19.3 m), but the applicability of the tunnel crosssection in the deep buried area (buried depth of 48.5~49.3 m) is not good. (4) For the first time, the uneven convergence mode of the tunnel crosssection from the metro shield is introduced into the mountain tunnel. Due to the complexity of the mountain tunnel construction, the current research on the WT5《TNR#I》〗KWT5《TNR》〗 value of the mountain tunnel is only a preliminary applicability study, which needs further study.

Key words: soft rock tunnel, uneven convergence mode, crown settlement, horizontal convergence, tunnel ovalization