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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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New technologies for high-risk tunnel construction in GuiyangGuangzhou high-speed railway

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Journal of Modern Transportation 2013年第4期21卷 258-265页

作者： Yubao Zhao Shougen Chen Xinrong Tan Ma Hui MOE Key Laboratory of Transportation Tunnel engineering Southwest Jiaotong University China Railway Erju Co.Ltd

Based on the construction of high risk tunnels in Guiguang-Guangzhou high-speed railway, several new technologies were developed for high-risk tunnel con- struction. First, an integrated advanced geological predic- tion was developed for tunneling in karst area. Then, a new system of ventilation by involving the dedusting technol- ogy was proposed and used in the field, which received a good air quality. Finally, a method to minimize the dis- tance between the working face and the invert installation was proposed by optimizing the invert installation and adopting the micro bench method. Applying the method to the project obtained an excellent result. The achievement obtained for this study would be able to provide a valuable reference to similar projects in the future.

关键词： tunneling engineering High-speed railway New technologies High-risk tunnel

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USEOFFULLFACESLURRYSHIELDFORPIPEJACKINGINHONGKONG'SRECLAIMEDLAND

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岩石力学与工程学报 2003年第S1期22卷 2438-2442页

作者： Ying H M~1 Poon S W~2(1 The University of Greenwich,Greenwich,U.K.)(2 Department of Real Estate and Construction,The Universily of Hong Kong,Hong Kong,China)

Pipe jacking has become a popular method in drainage construction in Hong ***,the variedground conditions encountered in reclaimed land may pose severe problems to pipe jacking *** paper presentsthe experience of using the full face slurry shield for pipe jacking in a reclaimed *** study shows that the full faceslurry shield with a rock cutting head performs *** ensure the machine can work effectively in all groundconditions,other factors need to be considered including the rock cutting head being worn away,the hitting of under-ground structures,the sustainability of jacked pipes alignment,the associated ground settlement and the damage to thejacked pipes caused by the jacking pressure.

关键词： tunneling engineering full face slurry shield pipe jacking drainage construction reclainted land Hong Kong

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Anisotropic deformation in Muzhailing railway tunnel,Gansu,China

Anisotropic deformation in Muzhailing railway tunnel,Gansu,C...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Peng Sha Faquan Wu Qiliang Guo Key Laboratory of engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Science Institute of Crustal Dynamics Chinese Earthquake Administration

Muzhailing railway tunnel is excavated mainly in fault zones,carbonaceous slate and sandstone using the drilling-blasting *** problems encountered in the tunnel during construction,such as large squeezing deformation with long duration and collapse of arch *** monitoring data shows the ratio between the maximum cumulative horizontal and vertical displacements reaches to 4 to 10,which shows an anisotropic ***,serial hydraulic fracture stress tests we conducted in tunnel indicate that coefficient of lateral pressure k approaches to 3,compared to the ratio of in-situ stress which is about *** geological analysis and the numerical simulation show that the special rock mass with layered structure presents an appearance of heterogeneous condition which affects the redistribution of stress in tunnel and takes major responsibility for the large horizontal deformation of *** addition,blasting excavation and groundwater also caused some problems during the excavation of the tunnel.

关键词： tunneling engineering Large deformation Layered structure Special rock mass

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