[1]赵万强,李金宜,罗禄森,等.中老铁路盐岩地层隧道断面型式研究[J].高速铁路技术,2024,15(05):92-99.[doi:10.12098/j.issn.1674-8247.2024.05.016]
　ZHAO Wanqiang,LI Jinyi,LUO Lusen,et al.Study on Tunnel Section Types in Salt Rock Strata for the China-Laos Railway[J].HIGH SPEED RAILWAY TECHNOLOGY,2024,15(05):92-99.[doi:10.12098/j.issn.1674-8247.2024.05.016]
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中老铁路盐岩地层隧道断面型式研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
15卷
期数:
2024年05期
页码:
92-99
栏目:
勘察设计
出版日期:
2024-10-30

文章信息/Info

Title:
Study on Tunnel Section Types in Salt Rock Strata for the China-Laos Railway
文章编号:
1674-8247(2024)05-0092-08
作者:
赵万强1; 李金宜1; 罗禄森1; 王志杰2
(1.中铁二院工程集团有限责任公司, 成都 610031; 2.西南交通大学交通隧道工程教育部重点实验室, 成都 610031)
Author(s):
ZHAO Wanqiang1; LI Jinyi1; LUO Lusen1; WANG Zhijie2
(1.China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China; 2.MOE Key Laboratory of Transportation Tunnel Engineering, Southwest JiaotongUniversity, Chengdu 610031, China)
关键词:
铁路隧道;  盐岩地层;  断面型式;  数值计算;  层次分析法;  现场量测
Keywords:
railway tunnel;  salt rock strata;  section type;  numerical calculation;  analytic hierarchy process;  field measurement
分类号:
U459.1
DOI:
10.12098/j.issn.1674-8247.2024.05.016
文献标志码:
A
摘要:
中老铁路盐岩地层隧道施工中出现基底塌陷、衬砌开裂等病害。为保证该隧道安全施工和健康服役,采用现场勘探、数值计算、理论分析、监控量测等方法对隧道断面型式进行研究。结果表明:(1)蛋形断面围岩变形略小于原马蹄形断面,但塑性区面积大幅增加; 椭圆形、圆形断面有利于围岩稳定;(2)马蹄形断面拱顶存在应力集中,蛋形断面墙脚应力较大,椭圆形、圆形断面受力均匀,且椭圆形安全系数大于圆形;(3)将断面面积、衬砌周长、洞周变形率、围岩塑性区面积比、最小安全系数作为评价指标,综合考虑施工因素,圆形断面型式最优;(4)隧道采用圆形断面施工后,围岩变形、应力大幅度减小,衬砌无裂缝,仰拱底鼓情况改善。
Abstract:
During the construction of tunnels in salt rock strata for the China-Laos Railway, issues such as base collapse and lining cracks have emerged. To ensure the safe construction and healthy operation of these tunnels, a comprehensive study on tunnel section types was conducted using methods including field exploration, numerical calculations, theoretical analysis, and monitoring measurements. The results indicate:(1)The deformation of surrounding rock in the egg-shaped section is slightly less than that in the original horseshoe-shaped section, but the plastic zone area increases significantly. Elliptical and circular sections are more conducive to the stability of surrounding rock.(2)Stress concentration occurs at the vault of the horseshoe-shaped section, while the wall feet of the egg-shaped section experience higher stresses. Elliptical and circular sections exhibit uniform stress distribution, with the elliptical section having a higher safety factor than the circular one.(3)Considering the section area, lining perimeter, deformation rate around the tunnel perimeter, ratio of plastic zone area in surrounding rock, and minimum safety factor as evaluation indicators, along with construction factors, the circular section type is determined to be the optimal choice.(4)After adopting the circular section for tunnel construction, the deformation and stress of surrounding rock are significantly reduced, no cracks are observed in the lining, and the uplift of the invert is improved.

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备注/Memo

备注/Memo:
收稿日期:2023-08-28
作者简介:赵万强(1970-),男,教授级高级工程师。
更新日期/Last Update: 2024-10-30