Viscoelastic plastic interaction of tunnel support and strain-softening rock mass considering longitudinal effect
作者机构：Institute of Rock MechanicsNingbo UniversityNingbo315211China Ningbo Key Laboratory of Energy GeostructureNingbo315211China Shenzhen Shenshui Water Resources Consulting Co.LtdShenzhen518000China POWERCHINA Chengdu Engineering Co.LtdUrban and Rural Development Engineering BranchChengdu610031China
出 版 物：《Rock Mechanics Bulletin》 (岩石力学通报（英文）)
年 卷 期：2024年第3卷第4期
页 面：70-82页
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
基 金：supported by the National Natural Science Foundation of China(Grant No.42207176 and 52278402) Ningbo Public Welfare Research Program Project(Grant No.2023S100) Ningbo Natural Science Foundation(Grant No.2022J116) China's National Key R&D Program“Intergovernmental International Science and Technology Innovation Cooperation”(Grant No.2024YFE0105800)
主 题：Tunnel excavation Strain-softening Generalized Zhang-Zhu strength criterion Time-dependent behavior Longitudinal effect
摘 要：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 combinationsupport method are divided into three categories:“yield before resistsupport,“yield-resistsupport,and“control-yield-resist*** show that the support reaction of“control-yield-resistis much higher than that of“yield before resistif the initial geostress is not very high,but the effect is not obvious on controlling the surrounding rock ***,the“yield before resistsupport 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-resistsupport 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.
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