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  Initial proposal and discussion on performance based waterproofing design for mountain tunnels

  There is a saying: nine in ten tunnels seepage in tunnel and underground engineering in China. It’s not much exaggerated as severe leakage and repeat maintenance. For a long time, we put the problem mainly due to the traditional waterproofing sheets. As to the mountain tunnels of composite tunnel lining the waterproofing sheet membrane is sandwiched between temporary sprayed concrete lining and permanent cast in situ concrete lining. Temporary sprayed concrete lining is uneven and often exists anchor and bolt head (as shown in Fig.1). In the process of binding rebar (as shown in Fig.2), the traditional waterproofing sheet membranes are easily destroyed. Obviously, this kind of waterproofing material is not the best choice, and all over the world are looking for a new waterproofing material.

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