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Analysis on Construction Security and Lining Structure of Multi-arch Tunnel in Weak Surrounding Rock Section

Chen Fubin,Ding Maorui  
With the engineering background of a highway tunnel in Shenzhen,the finite element program is used to numerically simulate the construction process of multi-arch tunnel,and achieves the deforming rule and stress distribution characteristic of tunnel surrounding rock,and the rule of surrounding rock displacement with the time change.The load-structure method is used to check the secondary lining inner force and the sectional reinforcement of tunnel.The checking result shows that the strength of lining structure can be upgraded by increasing the local sectional thickness and the reinforcing bars so as to guarantee the safe construction of tunnel at the maximum extent.
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