Abstract
In a pyrite mine extraction is being done by longwall and pillar mining leaving rectangular barrier pillars between panels. The barriers are alternately 30 m and 10 m wide. Because of complete extraction between barriers, the roof rock is assumed to have collapsed to a certain height leaving an intact rock beam elastically supported by barriers. The method of strain energy has been used to estimate barrier load, the configuration being likened to an infinitely long beam on alternately stiff and soft springs. The usual differential equations for beam deflection could not be used because of statical indeterminacy of this problem. The strength of pyrite and nether shale rock has been determined from compaction strength indices and safety factors for barriers have been given.
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