After a stop to completely change the entire cutterhead due to abrasive wear and impact damage, the TBM on the first tube of the Hallandsas rail project in a delicate wetland region of Sweden, has been relaunched on the last leg of its drive.The 10.53m diameter Mixshield (S-246) was launched in October 2005 from the south portal and has progressed 2.5km, or almost halfway, into its drive on first tunnel of the twin tube project. Geology along the alignment is gneiss, amphibolite and dolorite, a range of extremely abrasive rocks with UCS greater than 250MPa.
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