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《Chinese Journal of Underground Space and Engineering》 2017-03
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Analyses of Deformation and Failure Mechanism of Soft Rock Tunnel in Meizoseismal Areas

Zhou Zelin;Chen Shougen;Zhao Yubao;Zhang Haisheng;Key Laboratory of Transportation Tunnel Engineering(Ministry of Education),Southwest Jiaotong University;School of Civil Engineering,Southwest Jiaotong University;  
The deformation characteristic and failure mechanism of tunnels in meizoseismal areas are different from general tunnels.Based on the measured data of surrounding rock deformation and stress for Tangjiashan tunnel in meizoseismal area,the deformation and failure mechanism for soft rock tunnel in meizoseismal areas were analyzed.Research found that:(1) the distribution of tunnels deformation in meizoseismal areas was uneven.The value of tunnel horizontal convergence was 2~4 times larger than that of vault settlement,which was caused by both the soft rock properties of dilatation and the vertical high geostress zone where the tunnel located.(2) The spatial constrained zone affecting the tunnel deformation was in the range of 2~3D.In the range of spatial constrained zone,the deformation was coupled of spatial effect and time effect;(3) The deformation and failure mode of surrounding rock were closely related to the different properties of rock pressure in different parts of tunnel.The surrounding rock near sidewall under the force of "deformation pressure"was prone to a large yield deformation.The rock mass at the arch of a certain range had a phenomenon of overall sink to cause a relaxation and "loosening pressure"of rock mass,which would make the surrounding rock at the arch of tunnel more prone to a deformation mutation and gravitational damage.The study has some reference value for similar projects.
【Fund】: 中央高校基本科研业务费专项资金(SWJTU11ZT33);; 教育部创新团队发展计划(IRT0955)
【CateGory Index】: U451
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