Study on tensile strength and energy dissipation characteristics of waste rock−tailings backfill based on Brazilian splitting test AITranslate

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

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To address the massive waste rock and tailings generated during ore mining processes,this study conducted Brazilian splitting tests on waste rock-tailings backfill specimens to achieve efficient utilization of general solid waste in mines and gain insights into the influence mechanisms of tensile strength and energy dissipation characteristics in waste rock−tailings backfill.Response surface methodology was employed to analyze experimental results regarding tensile strength and energy dissipation.The research systematically investigated the effects of varying waste rock addition rates,ash-sand ratios,slurry concentrations,and curing ages on the backfill’s tensile strength and energy dissipation.Results demonstrate that stress–strain curves of waste rock-tailings backfill exhibit distinct four-phase features including compaction,elastic deformation,yielding,and fracture.Under identical slurry concentrations,tensile strength increases with rising ash-sand ratios,waste rock addition rates,and prolonged curing ages,with the ash-sand ratio at 1∶4 showing the most significant impact under controlled conditions.The response surface-based tensile strength prediction model of the backfill achieves a multiple correlation coefficient of 0.9687,revealing the influence hierarchy:curing age>ash-sand ratio>waste rock addition rate.Elastic strain energy density accounts for over 98%of total energy during backfill fracture,indicating that abrupt release of internal elastic strain energy constitutes the primary failure mechanism in Brazilian splitting tests.The research results can provide a theoretical basis for the optimization of waste rock−tailings backfill ratio in underground mines and for maintaining the stability of underground goafs and stopes.