Nowadays high levels of experience have been acquired in the excavation of horizontal tunnels using TBM, especially as far as tunnels with small diameters (about 4 m wide) are concerned. Less experience has been acquired in the excavation of tunnels under difficult alignment conditions, as in the case of steeply inclined excavations (up-hill tunnels). This paper presents the results of studies which compare the production data collected for tunnels excavated with TBM in "normal" conditions (horizontal tunnel), with those derived from steeply inclined excavations (up-hill tunnels).
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