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Permeability of lined tunnel

Permeability of lined tunnel

Permeability of lined tunnel

(OP)
Dear all,

Any information on the permeability of segmental concrete lining that without gasket in the connections.

Thanks.

RE: Permeability of lined tunnel

It seems like without gaskets, the joints would be more permeable than the concrete cross section?

Remember: The Chinese ideogram for “crisis” is comprised of the characters for “danger” and “opportunity.”
-Steve

RE: Permeability of lined tunnel

It also depends on what type of joint is used (butt, knuckle, etc...). I have not had experience with an ungasketed tunnel lining that didn't have some sort of liner installed post-construction.

RE: Permeability of lined tunnel

(OP)
Dear lha,

You are right. The permeability of joint without gasket is much higher than the concretre section. Having such arrangement is to allow the liner behaving in "semi-drained" condition, in which water can be drained throught the joints.

In my case, dewatering is not a concern and the "rock" tunnel itself is stable even without lining, but the client would like to have lining. "Semi-drained" lining allows a more economic design than a "water-tighted" lining.

Any idea on estimating the permeability of the joints? so that water pressure on the semi-drained lining can be estimated.

Thanks!

 

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