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Keywords: arriere
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Proceedings Papers
Spatial Distribution Patterns of Cracks In Longwall Roofs
Available to Purchase
Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-091
... types de fractures peut être partiellement utile, du moins, si elle reste dans des limites acceptables. La fracturation du toit facilite le foudroyage immediat en arrière du soutènement. Mais, generalement, elle n'a que des desavantages: elle augmente le risque de chutes, d'eboulements et de...