浅埋矩形隧道掘进面被动失稳混合破坏机制

doi:10.13722/j.cnki.jrme.2021.0439

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Abstract The urban shallowly buried box tunnels are usually built using jacking method. The face stability of the boring machine is a major problem in box tunnelling due to the fluctuation of the support pressure in the working chamber. The excessive support pressure triggers the passive failure of working face. In this paper，the problem is analysed by constructing planar admissible kinematically mechanism. In the proposed mechanism，the rotational and translational mechanism are included and the compatibility is satisfied by constructing an interface between the mechanisms using spatial discretization technique. The upper bound analysis is applied for stability analysis and the upper bound solution of support pressure is derived as a result. By optimizing the mechanism，the critical support pressure as well as associate failure mode is obtained. The parametric analysis indicates that the frictional angle significantly impacts the failure. The increase of frictional angle contributes to the failure zone expanding and the proportion of the block involved in translational movement to that in the rotational movement is reduced. As a result，the higher support pressure is required. With the increase of cohesion，the support pressure increases correspondingly but the failure mode is virtually unchanged. With the surcharge increasing，the failure region is enlarged and the support pressure is increased. The numerical simulation is employed for verification. The comparison indicates that the current solution matches to the numerical solution better than the previous solutions especially at high L/D. The applicability of the current solution in practice is discussed.

Key words： tunnelling engineering rectangular tunnel tunnel face passive instability composite mechanism upper bound analysis

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	Articles by authors
	LIU Wei
	WU Ben
	SHI Peixin
	JIA Pengjiao

Cite this article:

LIU Wei,WU Ben,SHI Peixin, et al. An advanced mechanism for the face passive instability of shield tunnelling with rectangular cross-section[J]. , 2022, 41(S1): 2673-2683.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0439 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2673

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