浅覆大跨度小净距隧道中岩墙及初支力学特性研究

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摘要 Mechanical properties such as stress, deformation, and plastic zone distribution of the middle-rock-wall, along with the mechanical characteristics of the preliminary lining under different spacings, are particularly important for guiding the design and construction of small spacing tunnels. A three-step excavation numerical analysis model of the tunnel excavation is established, simulating the following conditions:D/B=0.5, 0.75, 1, 1.5, 1.25, 2. The mechanical behavior of a middle-rock-wall was analyzed after multiple disturbances through the digging of another tunnel. The stress and deformation analysis of the middle-rock-wall changes resulting from different intervals showed that when the middle-rock-wall thickness is less than 0.75B, the plastic zone expands rapidly and connects to the upper part of the middle-rock-wall. This result indicates that the latter digging of the tunnel has great influence on the force and deformation of the middle-rock-wall and on the force of the initial structure of the advance tunnel. Under the unfavorable situation of D/B=0.5, grouting can be used to reinforce the middle-rock-wall; furthermore, grouting can also greatly reduce initial support force and improve the stability of the surrounding rock. Analysis results further show that the maximum axial force can be reduced by 49.1%, and that the maximum bending moment can be reduced by 29.1%. Thus, the stability of the surrounding rock is greatly improved through grouting reinforcement.

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	石钰锋
	罗青
	赵秀绍
	皮圣

关键词 ： tunnel engineering, middle-rock-wall, mechanical properties, numerical analysis, small interval

Abstract：Mechanical properties such as stress, deformation, and plastic zone distribution of the middle-rock-wall, along with the mechanical characteristics of the preliminary lining under different spacings, are particularly important for guiding the design and construction of small spacing tunnels. A three-step excavation numerical analysis model of the tunnel excavation is established, simulating the following conditions:D/B=0.5, 0.75, 1, 1.5, 1.25, 2. The mechanical behavior of a middle-rock-wall was analyzed after multiple disturbances through the digging of another tunnel. The stress and deformation analysis of the middle-rock-wall changes resulting from different intervals showed that when the middle-rock-wall thickness is less than 0.75B, the plastic zone expands rapidly and connects to the upper part of the middle-rock-wall. This result indicates that the latter digging of the tunnel has great influence on the force and deformation of the middle-rock-wall and on the force of the initial structure of the advance tunnel. Under the unfavorable situation of D/B=0.5, grouting can be used to reinforce the middle-rock-wall; furthermore, grouting can also greatly reduce initial support force and improve the stability of the surrounding rock. Analysis results further show that the maximum axial force can be reduced by 49.1%, and that the maximum bending moment can be reduced by 29.1%. Thus, the stability of the surrounding rock is greatly improved through grouting reinforcement.

Key words： tunnel engineering middle-rock-wall mechanical properties numerical analysis small interval

收稿日期: 2015-09-25

基金资助:Supported by the National Natural Science Foundation of China (No. 51208198; No. 51168014); the Jiangxi Province Postdoctoral Scientific Research Project Funding (No. 2015KY07)

通讯作者: SHI Yu-feng,E-mail address:s074811156@126.com E-mail: s074811156@126.com

引用本文:

石钰锋, 罗青, 赵秀绍, 皮圣. 浅覆大跨度小净距隧道中岩墙及初支力学特性研究[J]. Journal of Highway and Transportation Research and Development, 2016, 10(3): 51-59.
SHI Yu-feng, LUO Qing, ZHAO Xiu-shao, PI Sheng. A Study of the Mechanical Properties of Middle-rock-wall and Preliminary Lining of a Shallow Large-span Tunnel with Small Interval. Journal of Highway and Transportation Research and Development, 2016, 10(3): 51-59.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/ 或 http://manu27.magtech.com.cn/Jwk_gljtkj_en/CN/Y2016/V10/I3/51

[1] JTG D70-2004, Code for Design of Highway Tunnel[S]. (in Chinese)
[2] YAO Yong, HE Chuan, XIE Zhuo-xiong. Study of Mechanical Behavior and Reinforcing Measures Of Middle-rock-Wall of Parallel Tunnel With Small Interval[J]. Rock and Siol Mechanics, 2007, 28(9):1883-1888. (in Chinese)
[3] ZHANG Yong-xing, HU Ju-yi, HE Qing-yun, et al. On Rational Clear Spacing of Tunnel With Small Clear Spacing Based on Strength Reduction Technique[J]. Hydrogeology and Engineering Geology, 2006(3):64-67. (in Chinese)
[4] TANG Jin-song, LIU Song-yu, TONG Li-yuan, et al. The Minimum Safe Net Distance between Large Span Expressway Tunnels[J]. China Civil Engineering Journal, 2008,41(12):79-84. (in Chinese)
[5] QIN Wei-min, LI Qi, REN Wei-zhong. Monitoring Analysis of Surrounding Rock Displace of Complex Structure Tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(3):549-557. (in Chinese)
[6] GONG Jian-wu, XIA Cai-chu, ZHU He-hua, et al. Optimal Analysis of Construction Schemes for Heshang Small-Space Tunnels with Large Section[J]. Rock and Soil Mechanics, 2009, 30(1):236-240. (in Chinese)
[7] CHEN Qiu-nan, WANG Qin-rong, XIE Xiao-yu, et al. Mechanical Characteristics of Supporting Structure for Flat Super-large Section Small Spacing Tunnels[J]. Journal of Highway and Transportation Research and Development, 2012, 29(9):89-94. (in Chinese)
[8] LIU Yun, ZHOU Yu-bin. Study on Partition and Reinforcement Method of Middle Rock Pillar in Soft Rock Tunnel with Small Clear Distance[J]. Chinese Journal of Underground Space and Engineering, 2013, 9(2):373-379. (in Chinese)
[9] SHI Yu-feng, YANG Jun-sheng, YANG Feng, et al. Study of Stability of Surrounding Rock due to Approaching of Two Excavation Faces and Face Reinforcement in a Large Cross-section Tunnel in Weak Stratum[J]. Journal of Highway and Transportation Research and Development, 2013, 30(5):82-88. (in Chinese)
[10] YANG Jin-jing, LI De-wu. Numerical Simulation of Optimal Excavation Method of Close-Spaced Soft Rock Tunnel[J]. Journal of Lanzhou Jiaotong University,2014, 33(6):92-97. (in Chinese)
[11] LU Wei, CHEN Hao, LI Xiao-qing. Numerical simulation of Construction Process of Tunnel With Small Clear Distance[J]. Highway,2014, 59(10):291-296. (in Chinese)
[12] FENG Yi, CHEN Shou-gen. The Model Test Study for Highway Tunnel with Large Span and Small Clear Distance[J]. Highway Tunnel,2014,22(3):1-6. (in Chinese)
[13] WANG Geng-feng, XIONG Xiao-hui, ZHANG Yong-xing, et al. Comparative Study of Rational Excavation Method and Support Parameter for Large-span Small spacing Tunnel[J]. Journal of Highway and Transportation Research and Development, 2011, 28(3):101-107. (in Chinese)