Abstract: It is important to study the synergistic stress mechanism and its influencing factors of primary and secondary lining with sprayapplied waterproofing and provide reasonable parameters for lining structure design. A loadstructure calculation model is established based on uniaxial tensile, bonding tensile and shear tests of sprayapplied waterproofing lining, and the influence factors and action rules of the mechanical properties of sprayapplied waterproofing lining structure are studied. In the numerical model, according to the measured data, tunnel lining structure are simulated with different thickness of waterproof film, different interface parameters and thickness of secondary lining. The results show that: (1)The thickness of waterproof film has little effect on the mechanical properties of lining structure. (2)Different interface parameters have significant effect on the stress and displacement of lining structure, i.e.〖KG-*3〗, with the increase of interface parameters, the primary stress decreases while the stress of the secondary lining increases, the stress difference between the two decreases, and the synergistic force capacity of the lining structure increases. (3)Thickness decrease of secondary lining will reduce its safety factors, but is still within the limit value of the specification. 

 Therefore, the structural design of secondary lining can be further optimized.

Key words: tunnel engineering, lining structure, sprayapplied waterproofing, waterproof film, parameters of interface, optimization of secondary lining