Abstract：Research purposes: Taking the Dabieshan Tunnel of the Hefei － Wuhan Railway as the background，the study is done on the contact mechanical characteristics and the load bearing characteristics of single － layer lining in the different construction stages as well as on the stability of surrounding rocks for the purpose of clarifying the mechanical characteristics of single － layer lining to provide the reference to the design and construction of similar tunnels．
Research conclusions: ( 1) Compared with the composite lining structure，the contact pressure of single － layer lining structure is obviously bigger，and the maximum pressure is easy to occur at arch foot while the minimum prssure is easy to occur on inverted arch． The internal force of the secondary single － layer lining is obviously smaller than the composite lining． ( 2) The inner force in single － layer lining is firstly distributed following the supporting time and then distributed following the rigidity． ( 3) The YAI values of the surrounding rocks on the left and right arch web sides and arch foot are relatively small，and where is easy to destabilize，so the relative measure should be taken．
吴建军. 破碎围岩条件下铁路隧道单层衬砌结构力学特征研究[J]. 铁道工程学报, 2011, 28(4): 53-57.
WU Jian － jun. Study on Mechanical Characteristics of Single － layer Lining of Railway Tunnel Under Condition of Fractured Surrounding Rock. 铁道工程学报, 2011, 28(4): 53-57.
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2011, Vol. 28 
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