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Research on Indoor Model Test About Effect of Combined Reinforcing on Structure Bearing Capacity of Defect and Disease Tunnel

HE Chuan1,LI Zu-wei1,2,SHE Jian2,WANG Bo1 (1.Department of Tunnel and Underground Engineering,Southwest Jiaotong University,Chengdu 610031,China;2.Chongqing Expressway Development Co.,Ltd.,Chongqing 400010,China)  
Taking the Bijia Mountain Tunnel under construction in Chongqing City as in-situ sample and geometric similarity ratio of 1∶25 is adopted in model test.The loads are applied to the structure till they produce the diseases,and then loads applied again while the structure is destroyed after taking different combined reinforce in different rock mass, crustal stress and defect tunnel,in order to research on the destroyed form and bearing capacity of structure in different conditions after reinforcing.And the concludes show that surface and bolts reinforce should be taken according to the structure are compress and tension in defect tunnel;when cavity and thinning exist,backfilling pressure casting should be the first selection,and then combined inner lining,arch centering and bolts reinforcing or inner surface and bolts reinforce;as to the tunnel without invert diseases the two springs should be strengthened while reinforcing,and foundation should be built when taking inner lining and arch centering reinforcing,otherwise grouting and locked bolts should be taken to reinforce.
【Fund】: 重庆市科技计划项目(200209034)
【CateGory Index】: U451.5
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