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Keywords: widening
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-042
... cavern, which is also D-Shaped, is 20m wide, 25m high and 173m long and is in close proximity to powerhouse cavern. The arch portions of both the caverns were excavated by first excavating a central drift and then by widening this drift on both the sides. The sequence of excavation of arch portion...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-066
..., and have no covering. They only have a primary support in a few highly localised zones. Madeira Island sprayed concrete portal widening Encumeada tunnel levada Island canal execution intake structure Thickness localised zone marine transportation characteristic hydraulic exploitation...

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