Required strength for side exposed backfill in open stoping mining considering arching stress of backfill AITranslate

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Chinese Library Classification Number:TD803[矿业工程—矿山开采]

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A reasonable evaluation of the required strength of side-exposed backfill is essential for safe and economic mining in open stoping with subsequent backfill.The backfill stress distributions and contact properties between backfill and rock should be considered in the evaluation method.In this study,analytical models for arching stresses of uncemented backfill in secondary stopes and side-exposed cemented backfill in primary stopes have been proposed,respectively.Additionally,the lateral pressure exerted by uncemented backfill and the frictional resistance along the rock-backfill interfaces were investigated to reveal the contact mechanisms affecting the stability of side-exposed backfill.An analytical model was then proposed to evaluate the required strength of side-exposed backfill with a potential sliding plane.Numerical simulations across varying stope sizes and backfill parameters were conducted to validate the analytical solution.The results demonstrate a high level of consistency between the analytical solutions and numerical results when the direction angle of the sliding plane is α = 45° + ϕ_c/2 and the direction angle of frictional resistances is β = 45°-ϕ_c/2.The optimized three-dimensional analytical model effectively evaluates the strength requirements of side-exposed backfill subjected to lateral pressure from the adjacent uncemented backfill.At last,a method for translating theoretical strength requirements into practical design strengths of backfill using a floating factor of safety is discussed,which can provide a framework for cost-effective and safe backfill strength design in open stoping mining.