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《Chinese Journal of Underground Space and Engineering》 2008-04
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Study on Stability of Double-arch Tunnel with Variational Curved Middle-wall

WU Guo-jun1,CHEN Wei-zhong1,YU Hong-dan1,GUO Xiao-hong2,CHEN Li-bao3(1.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock andSoil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China;2.China Communication Second Highway Survey,Design and Research Institute,Wuhan,430052,China;3.The Fourth Survey &Design Institute of ChinaRailway,Wuhan 430063,China;)  
There are few research achievements about deformation and damage mechanism for double-arch tunnel with thickness-changing curved middle-wall at home and aboard.Based on the geological feature and characteristic of support design of Baziling branch fork tunnel which belongs to Shanghai-Chengdu expressway,ABAQUS code is applied to simulate the whole process of double-arch tunnel to study the stability of rock mass and support.It can be concluded that the stresses of rock mass above the curved middle-wall have changed greatly during excavation.The thicker the curved middle-wall,the smaller the maximum compressive stress of surrounding rock,so does the plastic zone of surrounding rock mass.With thicker curved middle-wall,the compressive stress of curved intermediate-wall becomes smaller.Comparison between the numerical results and field measurements shows that,the variation of deformation and stress of rock mass and support obtained by simulation was in good agreement with that by field monitoing.
【Fund】: 国家自然科学基金(No.90510019 No.50579087);; 科技部863项目(2007AA11Z108)资助课题
【CateGory Index】: U451.2
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