... good qualityrock mass4,1 4,2 4 ,3 4,44 ,5 4,6 5, 1 5, 2 5, 3 5, 4 5, 5 5, 66,1 6,2 6 ,3 6,4 6 ,5 6,6Larger caverns maybe created in betterquality rock massesFig. 13. 2a Interaction of rock parameters ... at depth mayinduce less disconti-nuities movementτδ2,12,22 ,3 2,4 2 ,5 2,61,11,2 1 ,3 1,4 1 ,5 1,6 3, 1 3, 2 3, 3 3, 4 3 ,5 3, 6Larger cavern needmore supportExcavationsMethodsTunnel BoringMachinesBlasting, ... swellex.ContinuedTunnel instrumentation 231 P2P2P1P 3 2 13 P 3 P1P2P2PP 3 P 3 P1P1Load cell2 13 P2P2P4P 3 P 3 P1P1Load cell2P4 13 4a. Circular support in 3 pieces, jointsat 120deg.,...