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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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

Received: 25 September 2015

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

Corresponding Authors: SHI Yu-feng,E-mail address:s074811156@126.com E-mail: s074811156@126.com

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	SHI Yu-feng
	LUO Qing
	ZHAO Xiu-shao
	PI Sheng

Cite this article:

SHI Yu-feng,LUO Qing,ZHAO Xiu-shao, et al. A Study of the Mechanical Properties of Middle-rock-wall and Preliminary Lining of a Shallow Large-span Tunnel with Small Interval[J]. 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/EN/ OR http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/Y2016/V10/I3/51

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