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The research performed in the mineyards of Sinni Mountain in Sardinia, offered the opportunity to study the behaviour of tunnels in terms of their mutual position and of the different conditions of the rock mass.

The conclusions of the research are summarised as follows:
in the plastic situation, and by installing the standard kind of reinforcing support, in the long term relevant deformations take place, especially and more so at the bottom of the gallery;
the curves of deformation in the plastic masses, or assimilable to them, become balanced with difficulty even in the long term;
the digging of tunnels close to existing tunnels puts the rock mass in motion even years later causing sudden variations of the deformation-time gradient;
the area where the rock mass is modelled, or put in motion, stretches deeply with regard to the tunnels, the order of extension being greater than three or four diameter equivalents;
in production, where the mass behaves essentially in a plastic way, the tunnels having a interaxis of 30 metres behave as one complex whose inner nucleus is barely stressed.

The aim of the research was therefore essentially achieved, having given the opportunity of verifying phenomena in conditions of rock masses on a modest scale, which were basically unknown. unknown.

Additional information

Authors: CARBOSULCIS SPA, Carbosulcis SpA, Miniera Monte Sinni, Cortoghiana (IT)
Bibliographic Reference: EUR 17182 EN (1997) 299pp., FS, ECU 51.50
Availability: Available from the (2)
ISBN: ISBN 92-827-9291-9
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