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.
