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《Journal of Highway and Transportation Research and Development》 2011-04
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Analysis of Tunnel Stability Based on Strength Reduction Method

AN Yonglin1,2,HUANG Kan2,3,PENG Limin3,PENG Jianguo2,DING Guohua2 (1.Key Laboratory of Civil Engineering Construction Process & Quality and Safety Control of Ordinary College in Hunan Province,Hunan University of Science and Technology,Xiangtan Hunan 411201,China; 2.Hunan Provincal Communication Planning Survey and Design Institute,Changsha Hunan 410008,China; 3.School of Civil Engineering and Architecture,Central South University,Changsha Hunan 410075,China)  
In order to determine the transverse stability of surrounding rock of DIIK1563+340~DIIK1563+410 section of Liuyang River Tunnel in the Wuhan-Guangzhou passenger line,strength reduction method and finite element software were used to build the simulation models with different strength reduction factors.The relations between strength reduction factor and vault settlement,ground subsidence,principal stress and plastic zones were analyzed,and failure shape of the tunnel section was analyzed as well.The results show that(1) safety factor of the tunnel is 2.3,plastic zones firstly appear on both sides near the arch foot,and then extend to the hance,then to the ground surface;(2) vault settlement,surface subsidence and plastic zone are more sensitive to the strength reduction factor.Therefore,the quality of foot anchors installation and I-beam should be ensured,vault settlement or ground subsidence should be as a major criterion for instability of the tunnel for it is easier to monitor deformation than plastic zone.
【Fund】： 中国博士后科学基金资助项目(20090461021);; 湖南省研究生创新基金资助项目(3340-74236000004);; 湖南科技大学博士启动基金资助项目(E51095)
【CateGory Index】： U451
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