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Based on the method of finite element orthogonal test, this paper designs the experimental scheme and gives numerical model of top coal drawing with non chain pillar entry protection. 16.

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Breccia geologicterm rockconsisting angularfragments (interclasts) finerore matrix. Mining Methods extractedusing room pillarmining methods driftsranging from 28 32feet wide. havedimensions ranging from 25 30feet eachside totalextraction ratio approximately75%.

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