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Abstract The physical and mechanical property of gangue was crucial for backfill mining. To study the physical and mechanical properties of gangue in Changzhi mining area, the gangue was classified into seven gradations. In a specially made gangue compression drum, the MTS815.02 electro-hydraulic servo rock mechanics test system was adopted to carry out compression experiment on gangue. As a result, the relations between stress and strain, compaction bulk density, deformation modulus and time strain relation of gangue were obtained as well as crushing system of gangue. The result showed that the evenly-proportioned test specimen had following properties: the minimum crushing coefficient was, the strain was the smallest under the same stress condition; under the same stress condition, if the compacted bulk density was the largest, the modulus of deformation was the largest as well; the strain was minimum in the same time under certain stress condition. Therefore, the uniform ratio should be selected when choosing the ratio of filling material.
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