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Using the way of driving and filling by solid wastes to replace parts of coal is an important technical path for solving protective coal pillar of "under three" coal mining and industry square in our coal mine, and the key depends on whether the new bearing structure formed by backfill and residual pillars can effectively substitute for the original large coal pillars or not. We obtained the influencing factors from stable dual bearing structure by the establishing mathematical model anddoi:10.1016/j.proeps.2009.09.047 fatcat:cb4vcyj2gfhshoxv22hcgwlbmy