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  Evaluation of tunnel linings considering shapeand waterproofing interface

  The traditional construction method of the sprayed concrete lining (SCL) in soft ground tunnelling comprises a temporary primary lining of sprayed concrete, a permanent cast-in-situ or sprayed secondary lining and a sheet waterproofing membrane interface between them. This design philosophy has changed in the last two decades. It is wasteful in terms of material and financial resources considering the primary lining as sacrificial, thus a new design approach suggests the primary lining to be part of the long-term permanent structure. If the sheet synthetic waterproofing membrane is substituted with a sprayed one, some bond can also be assumed between the two linings leading to a composite action of the whole system. However, there is not enough research on how efficient this function becomes in relation to the tunnel geometry. The main purpose of this paper is to provide insights on the influence of the membrane properties in tunnel’s structural performance in conjunction with the composite system geometry and hence overall stiffness characteristics.

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