Abstract
ABSTRACT The largest sewage treatment plant in Norway is being constructed underground at Bjerkas, 30 km south of Oslo. The plant will serve 300 000 persons and is designed to treat a dry weather flow of 3.0 m3/s. The main reason for the subsurface location is environmental. The plant is being placed in 11 parallel caverns of 16 m span with 12 m wide pillars between. The rocks in the area are Cambro-Silurian shale and nodular limestone. The conditions revealed by excavation were very similar to those predicted from the combined results of surface mapping, drill core analyses and seismic measurements The support is systematic bolting and shotcrete, partly mesh reinforced. Some injection work has been undertaken to prevent inflow of water. The rock mass underlying an industrial area nearby is fed by water through several bore-holes to prevent lowering of the ground water table in the overlying clay.
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