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Title:	Austrian Tunnel Day
Abstract:	In the Frasers underground gold mine in New Zealand several previously mined areas had to be sealed off and secured against water ingress. To ensure that the bulkhead structures are effective, the surrounding highly fractured rock masse had to be reinforced. In cooperation with Mastermyne, DSI Underground Australia suggested pumping Mineral Bond urea silicate resin into the rock mass around the drive to consolidate the ground and eliminate the water passage around the bulkhead seal sites. Mineral Bond was chosen as it is a nonexpanding resin which is unaffected by water, remains flexible and develops a strength of 40 MPa (see page 738). Im neuseeländischen Goldbergwerk Frasers mussten alte Abbaubereiche abgedämmt und gegen Wassereinbruch gesichert werden. Damit die Schottbauwerke wirken, musste das umgebende gebräche Gebirge ertüchtigt werden. In Zusammenarbeit mit Mastermyne schlug DSI Underground Australien zur Konsolidierung und Abdichtung des Untergrunds vor, das Harnstoff-Silikatharz Mineral Bond in das Gebirge um den Stollen herum zu injizieren. Das Produkt Mineral Bond wurde ausgewählt, weil es sich um ein flexibles und nicht expandierendes Kunstharz handelt, auf das Wasser keine Auswirkungen hat und das eine Festigkeit von 40 MPa entwickelt (siehe Seite 738).
Source:	Geomechanics and Tunnelling 11 (2018), No. 6
Page/s:
Language of Publication:	English/German

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