• Explosives and Blasting
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• v.34 no.4
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• pp.35-39
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• 2016

Influence of rock fall from upper-level roofs to lower-level roofs and pillars at a multi layered room and pillar mine was numerically simulated by using AUTODYN. The analysis results showed that the maximum displacement and stress in the roof of the lower-level stope are respectively 0.001 mm and 36 MPa, and those in the pillars of the lower-level stope are 0.0003 mm and 3 MPa. The maximum damage levels in the roof and pillar of the lower-level stope were evaluated to be about 0.03 when a half of the roof rock of the upper-level stope was assumed to be fallen to the floor.