Full Scale Testing Develops Efficient Preloaded Concrete Pllars
John J. Reed and C. David Mann
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Describes an effort to develop stronger, more effective concrete pillars for underground mine support. Experience indicated that pillars that were not preloaded do not carry appreciable loading until roof rock and adjacent rock pillars have begun to fail. An analysis is presented of data collected during construction, testing, and preloading of 10 large prestressed concrete mine pillars.