1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China;
2. Jiangxi Provincial Institute of Water Science, Nanchang Jiangxi 330029, China;
3. School of Mechatronics Engineering, East China Jiaotong University, Nanchang Jiangxi 330013, China;
4. Civil Engineering School of Central South University, Changsha Hunan 410075, China
A Study of the Mechanical Properties of Middle-rock-wall and Preliminary Lining of a Shallow Large-span Tunnel with Small Interval
SHI Yu-feng1,2, LUO Qing3, ZHAO Xiu-shao1, PI Sheng4
1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang Jiangxi 330013, China;
2. Jiangxi Provincial Institute of Water Science, Nanchang Jiangxi 330029, China;
3. School of Mechatronics Engineering, East China Jiaotong University, Nanchang Jiangxi 330013, China;
4. Civil Engineering School of Central South University, Changsha Hunan 410075, China
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.
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.
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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