Abstract：Research purposes :Railway tunnel secondary lining is the structure system to assure the safety of railway tunnel operations，once the severe cracking of secondary lining happens， safe hidden trouble of railway tunnel will be formed，and the processing of the secondary lining cracking has difficult construction， high security risk and big economic loss. Based on typical cases， this paper analyzed the cause and the treatment scheme of the three special railway tunnel under the condition of secondary lining cracks， in order to attaches great importance from design， construction and construction management，to avoid similar situation from happening again. Research conclusions ：( 1) In the special geological tunnel such as the high stress soft rock and gypsum karst breccia， the secondary lining crack has characteristics of 11 sever craze degree，wide range of paragraphs，long concealed period . (2 ) Avoid setting bell type tunnel in high stress soft rock tunnel，at the same time，should pay attention to the influence of horizontal hole，horizontal channel and shallow buried valley to the main tunnel structure，and during the design the primary support and secondary lining should be strengthened. ( 3 ) The high stress soft rock tunnel construction should strengthen the control of surrounding rock deformation，strengthen the radial grouting reinforcement，and improve the bearing capacity of the surrounding rock. Before the secondary lining should accord with standard of deformation rate control， and avoid premature bearing of secondary lining. ( 4 ) Gypsum karst breccia tunnel should give full consideration to the long - term softening effect of the groundwater seepage field distribution on surrounding rock and the expansion of the surrounding rock after tunnel runs through， and the secondary lining structure design should be strengthened. (5 ) The research results can be applied to the process of the similar tunnel.
2016, Vol. 33 
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