Study on deformation control of double-layered initial support in tunnels considering short-term creep effects of surrounding rock
YANG Linlin1，YANG Wenbo1，TIAN Haosheng1，KOU Hao1，ZHANG Hang2，LIU Chongliang3，YANG Qiaowei1，HE Chuan1
(1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education，Southwest Jiaotong University，
Chengdu，Sichuan 610031，China；2. Sichuan Highway Planning，Survey，Design and Research Institute Ltd.，Chengdu，Sichuan 610041，China；3. China Construction Infrastructure Co.，Ltd.，Beijing 100044，China)
Abstract：Taking the Dongmachang No.1 tunnel of Huali Railway as the background，the short-term creep characteristics and creep parameters of muddy siltstone were analyzed by the uniaxial compression creep test and field monitoring，and the mechanical behavior of tunnel construction considering the coupling effect of short-term creep effect of surrounding rock and construction disturbance was explored. Then，the influence and the sensitivity of the mid-step length，the second layer of initial support installation timing as well as the initial support closure time on the tunnel support effects were analyzed. The results show that when the short-term creep effect of the surrounding rock is not taken into account，the displacement of the arch base is reduced by 27.03% and the area of the plastic zone is reduced by 16.91% in the calculation results. Different construction parameters have different effects on deformation control of each part of the tunnel. Changing the length of the mid-step and the timing of second layer initial support installation may efficiently distribute the support force of the first and second layers of the initial support；the earlier the initial support closure，the better the state of force in the tunnel. Sensitivity analysis results：mid-step length＞second layer of initial support installation timing＞initial support closure time. Construction control can be carried out according to the principle of “step growth，fast support and fast sealing; step shortening，slow support and slow sealing”.
杨林霖1，杨文波1，田浩晟1，寇 昊1，张 航2，刘冲亮3，杨侨伟1，何 川1. 考虑围岩短期蠕变效应的隧道双层初期支护变形控制研究[J]. 岩石力学与工程学报, 2023, 42(7): 1731-1742.
YANG Linlin1，YANG Wenbo1，TIAN Haosheng1，KOU Hao1，ZHANG Hang2，LIU Chongliang3，YANG Qiaowei1，HE Chuan1. Study on deformation control of double-layered initial support in tunnels considering short-term creep effects of surrounding rock. , 2023, 42(7): 1731-1742.
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2023, Vol. 42 
