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  Empirical Basis for the Design of Tunnel Linings in Swelling Rock containing Anhydrite

  Due to the great complexity of swelling processes in rock containing anhydrite, fre-quently encountered highly variable geological conditions and the changeable hydraulic conditions, a theoretically based estimate of swelling pressure is not possible. As an orientation up till now the results of laboratory swelling tests were frequently used. These, however, can lead to unrealistically high swelling pressures. The aim of this paper is to determine numerically the possible design values of swelling pressures for five tunnels that have existed for a relatively long time and to use the data as the basis for determining the swelling pressures acting on new tunnel structures.

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