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隧道建设(中英文)

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宁缠隧道高地应力软岩大变形控制措施研究

陈志敏1,张赓旺1*,龚军2,陈宇飞2,李增印2   

  1. (1. 兰州交通大学土木工程学院, 甘肃 兰州 730070;2. 中铁隧道局集团有限公司, 广东 广州 511458)


  • 出版日期:2023-04-13 发布日期:2023-04-13

Study on Control Measures for Large Deformation of Soft Rock Under High Geo-Stress in Ningchan Tunnel

CHEN Zhimin1, ZHANG Gengwang1*,GONG Jun2, CHEN Yufei2, LI Zengyin2   

  1. (1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;

    2. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong,China )

  • Online:2023-04-13 Published:2023-04-13

摘要: 为了解决高地应力软岩隧道在建设过程中支护及围岩不稳定、变形时间长、经常性设计变更的难题。通过分析国内外高地应力软岩隧道大变形控制措施成功案例,对隧道所处地应力及地质环境及其对应的工法与支护形式进行分类总结归纳,提出高地应力软岩隧道安全且经济有效的控制措施,并结合实际工程进行现场验证,对上述研究成果进行分析验证。结果表明:宁缠隧道岩体极破碎,岩石强度低,围岩产生大变形的主要原因有极高地应力,地层岩性、节理及软化夹层、岩层产状及倾角以及人为因素的影响;将强度应力比和相对变形结合地质构造情况对高地应力软岩隧道进行五级制大变形分级,可以精准的进行高地应力软岩大变形围岩分级;采取“抗让结合、柔度适度、共同承载”的变形控制理念,并通过预支护、支护、预留变形量、施工工法等措施相结合,可以有效的控制隧道大变形。

关键词:

隧道工程, 高地应力, 软岩大变形, 围岩分级, 变形控制

Abstract:

 In order to solve the problems of unstable support and surrounding rock, long deformation time and frequent design changes during the construction of soft rock tunnel with high geo-stress. To solve these problems, analysis of high stress soft rock tunnel of great deformation control measures at home and abroad successful cases, the geo-stress and stratum environment of tunnel and its corresponding method and supporting form is classified and summarized and put forward the high stress soft rock tunnel and security and economic and effective control measures corresponding relation, and combined with actual project verification. The above research results are analyzed and verified. The results show that the rock mass of Ningchan tunnel is extremely broken and the rock strength is low. The main reasons for the large deformation of surrounding rock are extremely high geo-stress, the influence of stratum lithology, joint and softening interlayer, rock occurrence and dip angle, and human factors. By combining the strength stress ratio and relative deformation with the geological structure conditions, the five-level large deformation classification of the tunnel in soft rock with high geo-stress can be carried out accurately. The deformation control concept of "combination of resistance to allowed, moderate flexibility and common load" and the combination of pre-support, support, reserved deformation and construction methods can effectively control the large deformation of the tunnel.

Key words: tunnel engineering, high geo-stress, large deformation of soft support, surrounding rock classification, deformation control