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Rock Mechanics Bulletin 2024年第4期3卷 70-82页

作者： Chen Xu Sheng Wang Caichu Xia Lei Liu Zhifu Ma Jun Yang Institute of Rock Mechanics Ningbo UniversityNingbo315211China Ningbo Key Laboratory of Energy Geostructure Ningbo315211China Shenzhen Shenshui Water Resources Consulting Co. LtdShenzhen518000China POWERCHINA Chengdu Engineering Co. LtdUrban and Rural Development Engineering BranchChengdu610031China

A simplified two-stage method was employed to provide an explicit solution for the time-dependent tunnel-rock interaction,considering the generalized zhang-zhu strength ***,a simplified mechanical model of the yielding support structure was *** tunnel excavation is simplified to a two-stage process:the first stage is affected by the longitudinal effect,while the second stage is affected by rheological *** cases are considered:one is that the rigid support is constructed during the first stage,and the other is that constructed at the second *** by the support timing at the seconde stage,different kinds of the“yield-resist combination”support method are divided into three categories:“yield before resist”support,“yield-resist”support,and“control-yield-resist”*** show that the support reaction of“control-yield-resist”is much higher than that of“yield before resist”if the initial geostress is not very high,but the effect is not obvious on controlling the surrounding rock ***,the“yield before resist”support is much more economical and practical when the ground stress is not very ***,under high geostress condition,through applying relatively high support reaction actively to surrounding rock at the first stage,the“control-yield-resist”support is superior in controlling the deformation rate of surrounding ***,in the high geostress environment,it is recommended to construct prestressed yielding anchor immediately after excavation,and then construct rigid support after the surrounding rock deformation reaches the predetermined deformation.

关键词： Tunnel excavation Strain-softening generalized zhang-zhu strength criterion Time-dependent behavior Longitudinal effect

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