考虑应力路径的深埋隧道黏弹–塑性围岩与支护相互作用

doi:10.13722/j.cnki.jrme.2021.0404

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Abstract The support reaction force of tunnels increases with time in viscoelastic-plastic rock mass，which makes the stress state of yielding surrounding rock in plastic zones move inward from the yield surface. Therefore，it is necessary to make clear the stress path of the surrounding rock when investigating the long-term mechanical characteristics of the interaction between rock and tunnel support. Considering the effect of the stress path，based on the generalized Kelvin model and Mohr Coulomb strength criterion，a simplified method for analyzing the viscoelastic-plastic stress，strain and displacement of the surrounding rock and the interaction between the support and the surrounding rock is proposed. In this paper，different kinds of“yield-resist combination”support technologies of high geostress soft rock tunnels are summarized into three categories as“yield before resist”， “yield while resist”and “control-yield-resist”. The influences of three kinds of support measures on the stress path of the surrounding rock are analyzed respectively. The deformation of the viscoelastic-plastic surrounding rock and the support reaction under different support measures are further studied. The results show that the calculated surrounding rock displacement is much larger if the stress path is taken into account. Under the condition of the same displacement release and the same stiffness of the lining support，the deformation rate of the surrounding rock at the initial stage is very large by adopting the measure of “yield before resist”，and the increasing support reaction force at the second stage is also the largest after applying the permanent support. It is most appropriate to adopt the “control-yield-resist”support measure under the condition of high geostress and serious deformation(for example，the initial stress exceeds 20 MPa). The prestress long bolt is employed to support the surrounding rock immediately after the tunnel excavation, which can not only control the deformation rate and improve the stability of the surrounding rock in the first stage，but also greatly reduce the additional support force and improve the stability of the lining structure during the second stage. Under the condition of low geostress and slight deformation(for example，the initial stress is less than 10 MPa)，the “yield before resist”measure can effectively control the deformation of the surrounding rock，and the “control-yield-resist” measure is not necessary. The “yield while resist”measure is applicable to the cases between the above two extreme conditions(e.g.，the initial ground stress is between 10 and 20 MPa). In addition，the deformation rate of the surrounding rock with a small viscosity coefficient is very large after excavation，for example，when the viscosity = 2×109 and 1×1010 Pa·d，the initial rock deformation rates are 17.6 and 3.5 cm/d respectively with the “control-yield-resist”measure. Therefore，for the surrounding rock with a small viscosity，large support reaction force must be applied immediately after excavation to control the deformation rate.

Key words： tunnel engineering large deformation of soft rock stress path viscoelastic plasticity yielding support

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	XIA Caichu1
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	XU Chen1
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	DU Shigui1
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Cite this article:

XIA Caichu1,2,XU Chen1, et al. Interaction between viscoelastic-plastic surrounding rock and support structure in deep tunnels considering stress path[J]. , 2021, 40(9): 1789-1802.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0404 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1789

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