Abstract
The Torpa Power Plant one of the 2 power stations in the Dokka project, features an air cushion surge chamber. The total volume of this chamber is 12,000 m3 and the air volume 10,000 m3 In the surge chamber area the rock overburden is 225 m while the water head is 450 m. To prevent air leakages a water curtain above the chamber is planned. The water curtain pressure has to be higher than the chamber pressure. On the other hand the pressure must be less than the minimum principle stress in the rock in order not to cause hydraulic fracturing. Extensive hydraulic fracturing tests have been performed. Based on test results the water curtain pressure is set to 4.9 MPa which is 0.5 MPa higher than the air pressure in the chamber. The air cushion surge chamber has been given a doughnut shape. The water curtain holes were drilled from a “manifold” camber above the sure chamber. Installations for a research programme will be made in the surge chamber.
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