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Keywords: support recommendation lie
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Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-503
... collapse if excavated without installing support. From unsupported span vs Q relationship chart by [11], Factor of Safety = 0.87. 4.2. Support recommendations for the metro station roof From Figure 3 the support recommendations lie in Block 19. SPAN/ESR = (17 / 1) m < 20 m (ESR = 1, since excavation...
