软弱围岩大断面隧道相向施工围岩稳定性分析与掌子面加固研究

doi:10.3969/j.issn.1002-0268.2013.05.014

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摘要 When the two excavation faces of a tunnel constructed from both the entrance and exit simultaneously in soft surrounding rock approach, the excavation surface disturbance areas are superimposed,stress and deformation in the surrounding rock become extraordinarily complex, which results in substantial deformation and instability. By combining the study of the surrounding rock stress and displacement caused by both unidirectional and face-to-face excavation in the Shizilong Tunnel, the stability of the tunnel face with two excavation faces approaching one another in a bidirectional construction is analyzed by numerical analysis. It is shown that, with the reduction in the length of the unexcavated soil between the two excavation faces, the plastic zone and deformation significantly increase, and the arching effect gradually weaken, resulting in greatly reduced tunnel stability. When the distance between the two excavation faces is less than the limiting distance, an extended range of the surrounding rock approaches plastic failure, and only effective countermeasures can guarantee the safety of the tunnel construction. Further, bamboo anchor pipe grouting is adopted to reinforce tunnel faces with the initial support strengthened, when those two excavation faces in the construction of the Shizilong Tunnel are approaching. Field implementation indicates that the tunnel is excavated safely.

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	石钰锋
	阳军生
	杨峰
	唐鹏

关键词 ： tunnel engineering, stability of surrounding rock, numerical analysis, face-to-face excavation, threshold distance

Abstract：When the two excavation faces of a tunnel constructed from both the entrance and exit simultaneously in soft surrounding rock approach, the excavation surface disturbance areas are superimposed,stress and deformation in the surrounding rock become extraordinarily complex, which results in substantial deformation and instability. By combining the study of the surrounding rock stress and displacement caused by both unidirectional and face-to-face excavation in the Shizilong Tunnel, the stability of the tunnel face with two excavation faces approaching one another in a bidirectional construction is analyzed by numerical analysis. It is shown that, with the reduction in the length of the unexcavated soil between the two excavation faces, the plastic zone and deformation significantly increase, and the arching effect gradually weaken, resulting in greatly reduced tunnel stability. When the distance between the two excavation faces is less than the limiting distance, an extended range of the surrounding rock approaches plastic failure, and only effective countermeasures can guarantee the safety of the tunnel construction. Further, bamboo anchor pipe grouting is adopted to reinforce tunnel faces with the initial support strengthened, when those two excavation faces in the construction of the Shizilong Tunnel are approaching. Field implementation indicates that the tunnel is excavated safely.

Key words： tunnel engineering stability of surrounding rock numerical analysis face-to-face excavation threshold distance

收稿日期: 2013-09-20

基金资助:Supported by the Project of Science and Technology Demonstration Engineering of Ministry of Transport of China (No.CXKJSF01061);the National Natural Science Foundation of China (NO.51008309);the Subject Innovation Fund of Hunan Province of China (No.CX2011B097);and the Support Fund for Excellent Doctoral Program of Central South University of China (No.2011ybzj032)

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

引用本文:

石钰锋, 阳军生, 杨峰, 唐鹏. 软弱围岩大断面隧道相向施工围岩稳定性分析与掌子面加固研究[J]. Journal of Highway and Transportation Research and Development, 2014, 8(1): 52-60.
SHI Yu-feng, YANG Jun-sheng, YANG Feng, TANG Peng. Study of Stability of Surrounding Rock due to the Approach of Two Excavation Faces and Face Reinforcement in a Large Cross-section Tunnel in Weak Stratum. Journal of Highway and Transportation Research and Development, 2014, 8(1): 52-60.

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