THE EFFECT OF SLIDING GAPS ON THE LINING OF TUNNELS
Tunneling in squeezing rocks presents some special challenges to the geotechnical engineer because in these rocks it is often necessary to install support as close as possible to the tunnel face to ensure the safety of the workers. If linings are installed before much deformation has occurred, these supports will be subjected to very large stresses as the tunnel deforms and the supports may fail. The sliding gaps can be added to the steel sets. These gaps allow the lining to easily deform and an amount of deformation occurs and therefore is not subjected to very high stresses.
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