Mechanical characteristics and damage evolution of rock-backfill composites under impact loading AITranslate

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

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In open-stope subsequent filling mining,the impact load from second-step orebody blasting threatens the stability of the first-step backfill,and rock thickness(RT) is a key factor regulating the mechanical behavior of rock-backfill composites(RBC).However,existing damage constitutive models fail to accurately capture the three-stage damage evolution of RBC under impact loading,especially the post-peak softening characteristics,which limits the scientific design of pillar thickness and the safety of mining operations.To address this engineering and academic gap,this study adopted the split Hopkinson pressure bar(SHPB) system to conduct impact tests on RBC specimens with four RT levels.A novel three-stage damage constitutive model(TS model) was established,with innovative consideration of residual strength in boundary conditions to improve prediction accuracy.Additionally,the TS model was systematically compared with the Weibull distribution-based model(WD model) and energy-based model(EM model) via error analysis and regression analysis.This study clarifies the regulatory effect of RT on the anti-impact performance of RBC and provides a reliable constitutive model for predicting its damage behavior,offering a theoretical basis and engineering reference for the stability control of filling mining systems.