Stability Evaluation Method of Large Section Tunnel Considering Modification of Cover-Span Ratio under Mechanized Operation Condition

被引：0
|
作者：
Zhang J. [1 ,2 ]
Liu Y. [1 ,2 ]
Yan B. [1 ,2 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[2] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 01期
关键词：
Basic quality index of surrounding rock; Buried depth; Cover-span ratio; Large section tunnel; Mechanized operation; Safety factor; Span; Tunnel stability;
D O I：
10.3969/j.issn.1001-4632.2022.01.11
中图分类号：
学科分类号：
摘要：
When the full section or large section mechanized excavation of the double-track high-speed railway tunnel is carried out, the accuracy requirements for the stability evaluation of surrounding rock are high. However, the existing industry standards do not consider the influence of buried depth and span when evaluating the tunnel stability. Therefore, it is necessary to study the stability evaluation method of large section tunnels considering the modification of cover-span ratio. First of all, taking Liuyuan Tunnel of Huanggang-Huangmei high-speed railway as the background, the third principal stress deflection of surrounding rock at a point directly above the vault after tunnel excavation was used as the criterion to determine the critical buried depth of large section tunnel. Then, the strength reduction method was used to numerically solve the safety factor of tunnel under different surrounding rock levels and cover-span ratios (buried depth and span ratio). The relationships between the safety factors of tunnels and cover-span ratios and the basic quality (BQ) index of surrounding rock under different surrounding rock levels were found by using mathematical statistics method. Finally, considering the influence of cover-span ratio, groundwater, initial stress of surrounding rock and structural occurrence factors, the modified BQ was obtained to evaluate the stability of mechanized large section tunnel with a buried depth of less than 100 m. The evaluation method was applied to the projects of Liuyuan Tunnel and Cimushan No. 2 Tunnel of the Urban Expressway in Chongqing for verification. The results show that under different surrounding rock levels, the tunnel safety factors meet the strict power function relationships with the cover-span ratios, and have certain linear relationships with BQ. The modified BQ is used as a quantitative index to evaluate the tunnel stability, which is more in line with the actual situation of the site. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：92 / 100
页数：8
相关论文
共 21 条
  • [1] HUANG Weike, CHEN Jiabao, ZHANG Libin, Et al., Mechanized Construction Technology for Large Cross-Section Longchang Highway Tunnel in Grade Ⅳ Surrounding Rock, Tunnel Construction, 40, 8, pp. 1203-1210, (2020)
  • [2] JIN Ming, WANG Minghui, ZHU Jianguo, Et al., Comparison between Rock-Drilling Jumbo and Manual Drilling-and-Blasting of Railway Tunnel, Tunnel Construction, 40, 1, pp. 99-105, (2020)
  • [3] ZHANG Mei, Key Measures for Construction Quality and Safety of Menghua Railway, Tunnel Construction, 37, 12, pp. 1503-1507, (2017)
  • [4] YU Li, CAI Minjin, Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of Zhengzhou-Wanzhou High-Speed Railway Tunnel Constructed by Full-Section Method with Large-Scale Machinery, Tunnel Construction, 38, 8, pp. 1316-1323, (2018)
  • [5] WU Wei, QIN Weihua, LUO Fujun, Economic Analysis on Large Cross-Sectional Mechanized Construction of Soft Rock Railway Tunnel, Tunnel Construction, 40, 12, pp. 1775-1780, (2020)
  • [6] WEI Zhihong, Application of and Economical Analysis on Tunnel Excavation by Hydraulic Rock Drilling Jumbos, Tunnel Construction, 32, 4, pp. 454-458, (2012)
  • [7] TB 10003-2016Code for Design of Railway Tunnel, (2016)
  • [8] SUN Hui, ZHENG Yingren, WANG Zaiquan, Et al., Discussion of Depth in the Amendment of Surrounding Rock Classification, Chinese Journal of Underground Space and Engineering, 8, 1, pp. 94-98, (2012)
  • [9] CHEN Zhiping, YE Xingjun, MENG Lubo, Et al., Study of Tunnel Excavation Span Influence on Surrounding Rock Grades, Journal of China and Foreign Highway, 31, 1, pp. 158-161, (2011)
  • [10] LIU Miao, SUN Yang, ZUO Changqun, Et al., Research on Surrounding Rock Classification of Deep-Long Buried Tunnel in Fault Zones, Highway, 60, 3, pp. 209-213, (2015)
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