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Viscoplastic solutions of time-dependent deformation for tunnels in swelling rock mass considering stress release

Journal of Rock Mechanics and Geotechnical Engineering 2023年第8期15卷 2053-2071页

作者： Gengyun Liu Youliang Chen hyonchol rim Rafig Azzam Department of Geotechnical Engineering Tongji UniversityShanghai200092China Department of Civil Engineering University of Shanghai for Science and TechnologyShanghai200092China Department of Engineering Geology and Hydrogeology RWTH Aachen UniversityLochnerstr.4-20 Haus AD-52064AachenGermany

Excavation and control of tunneling responses in swelling soft-rock tunnels of Sichuan-Tibet railway under seepage conditions were *** this,a fractional viscoplastic(FVP)model for swelling soft rocks was established by introducing Abel dashpot and unsteady viscosity coefficient,considering additional swelling deformation and damage of rock caused by humidity *** view of the FVP model,the viscoplastic deformation solutions for rock mass surrounding tunnel under seepage conditions were derived and long-term mechanical responses of swelling rocks upon tunnel excavation were ***,a stress release coefficient considering seepage and creep was proposed,based on which control responses considering stress release and failure mechanism of stress release measures were *** results showed that:(i)The one-dimensional(1D)FVP model has a good application for swelling rock and the three-dimensional(3D)FVP model could well describe the whole creep process of rock mass despite a much higher creep attenuation rate in the first stage of creep;and(ii)An appropriate stress release and deformation of surrounding rocks could effectively reduce the supporting ***,upon a large stress release,the radius of plastic region could increase significantly,and the strength of the surrounding rock mass decreases *** proposed solution could provide a theoretical framework for capturing the excavation and support responses for tunneling in swelling rock mass in consideration of time effect.

关键词： Sichuan-tibet railway Viscoplastic deformation Stress release Fractional model Tunneling engineering

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