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《Journal of Disaster Prevention and Mitigation Engineering》 2013-06
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Study on Numerical Simulation for Deformation of a Sandstone Tunnel during Excavation

YAN Zhi-xin;SHI Sheng;JIANG Ping;DANG Bing;LIU Can;XU Tian;School of Civil Engineering and Mechanics,Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education,Lanzhou University;  
As a case study,based on a realistic tunnel,we use elastic-plastic method to calculate the deformation of tunnel after excavation.Using the three-dimensional fast Lagrange analysis of continua method we analyse the deformation of tunnel during excavation.The result shows that the critical depth of plastic yield is 78.2m.When the excavation reaches 31min the tunnel,the stress of surrounding rock is released and tends to stability.The maximum deformation of tunnel is at the sidewall during excavation.It reached 1.94mm.The deformation of surrounding rock tends to stability after excavation which holds some days.During the construction,the tunnel is in tensile failure state at the vault and bottom,but in shear failure state at the sidewall.The conclusion in this paper can be referred to the design of sandstone tunnel.
【Fund】: 高等学校博士学科点专项科研基金课题(20090211110016);; 甘肃省建设科技攻关项目(JK2012-20)资助
【CateGory Index】: U451.2
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