Abstract：Research purposes:Based on the analyses of stability control factors of shallow－buried tunnel adjacent to mountain and the disadvantage of traditional design scheme，a new type of tunnel structure，permeable tunnel with ribbed arch beam，is presented． Researching the way for knowing the deformation mechanism and mechanical characteristics of permeable tunnel with ribbed arch beam can make the development trend of rock－slope mass during excavating．It can provide the basis for taking the preventive measures．
Research conclusions: With practical engineering，the design principle and structural characteristics of this tunnel are expounded; and on the basis of the study of the rock － slope mass structure features and deformation failure characteristics during this tunnel excavation，the deformation failure mechanism of this tunnel is elaborated; the interaction mechanics characteristic of the surrounding rock－supporting structure is systematically studied by numerical simulation method．The result shows that the coordination effect of the both is good，and the supporting strength is improved on the stress concentration area．
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Yang Xiaoli，Li Liang，Liu Baochen． Evaluation on Structure Stability of Asymmetrically Loaded Tunnels Using Theory of Information Optimization Analysis［J］． Chinese Journal of Rock Mechanics and Engineering， 2002(4) : 484－488．
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Han Kang． Research on the Scheme of Geological Route Selection in Stream Valley Zone［J］．Journal of Railway Engineering Society，2008(10) : 6－10．
［5］ 何光坤． 新奥法在浅埋偏压洞口段的应用［J］．隧道建设，2004(2) :25－27．
He Guangkun． Application of New Austrian Tunneling Method to Shallow － buried Tunnel Entrance with Unsymmetrical Loadings［J］．Tunnel Construction，2004 (2) :25－27．
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2011, Vol. 28 
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