Intense rockburst impacts in deep underground construction and their prevention

0447883 - ÚGN 2016 RIV CA eng J - Článek v odborném periodiku
Mazaira, Alejandro - Koníček, Petr
Intense rockburst impacts in deep underground construction and their prevention.
Canadian Geotechnical Journal. Roč. 52, č. 10 (2015), s. 1426-1439. ISSN 0008-3674. E-ISSN 1208-6010.
[International Colloquium on Geomechanics and Geophysics /5./. Karolinka, 25.06.2014-27.06.2014]
Grant CEP: GA MŠMT ED2.1.00/03.0082; GA MŠMT(CZ) LO1406
Institucionální podpora: RVO:68145535
Klíčová slova: rockburst * in situ stress * induced stress * destress blasting * yielding support
Kód oboru RIV: DH - Báňský průmysl vč. těžby a zpracování uhlí
Impakt faktor: 1.877, rok: 2015
http://www.nrcresearchpress.com/doi/full/10.1139/cgj-2014-0359#.VgqBTZc70ms

In the last few decades, in both mining and civil engineering projects, deeper excavations have been carried out than in the past. With this increase in depth, rocks may overstress and rock failures can occur during excavation. When competent rock strata are encountered under high stress conditions, these failures can vary from superficial spalling to explosive rockburst. Intense rockbursts may cause fatal injuries to workers and significant loss of equipment and time. The occurrence of rockbursts is always difficult to predict and special steps and measures must be taken to control them. First, burst-prone zones must be predicted by an early exhaustive geological study and by the assessment of in situ stress level and orientation. Second, basic design parameters, e.g., shape, size, and excavation method, should be modified and adapted to the expected conditions to minimize rockburst risk. Third, in situ pre-conditioning methods, e.g., destress blasting, can be applied to decrease the capacity of the rock mass to store energy. Finally, special rock support and reinforcement systems, i.e., yielding systems, must be installed after excavation to ensure total stability of the opening.
Trvalý link: http://hdl.handle.net/11104/0249631