关键词: 故障树分析法, LEC半定量评价方法, 矿房稳定性风险管控

Abstract: With the advancement of green mine construction，the stage and stope subsequent backfill mining method has been widely applied in large-scale mines. This method employs cemented tailings to backfill goafs，effectively reducing geotechnical hazards such as rock bursts. However，due to its two-phase extraction process（primary and secondary stoping），the stability of stope surrounding rock is influenced by various complex factors. This leads to significant risks of deformation，damage，or even collapse in the sur⁃ rounding rock during mining operations，posing a major threat to safe production in large mines. To enhance the stability of stope surrounding rock in subsequent backfill mining and ensure safety during ore extraction， Fault Tree Analysis（FTA）was adopted. Starting from potential accident types caused by unstable stope rock mass，FTA enables a backward deduction of root causes. Evaluation units were categorized based on geological conditions，mining technology，and management factors to identify potential risk sources. Subse⁃ quently，the LEC semi-quantitative risk assessment method was used to determine risk levels. Targeted con⁃ trol measures were formulated and implemented to prevent risks from evolving into hazards or accidents. Fi⁃ nally，dynamic inspections were conducted to verify the implementation of these risk controls，enabling timely identification of emerging hazards due to control failures，followed by closed-loop corrective actions to prevent hazard-induced accidents. Practical application demonstrates that by using Fault Tree Analysis （FTA）to identify risks in stope stability control at their source and eliminating hazards through process man⁃agement，the safety management of stope production has successfully shifted from post-incident response to proactive，pre-emptive risk control in the stage and stope subsequent backfill mining method.

Key words: Fault Tree Analysis, LEC semi-quantitative evaluation method, stope stability risk man? agement and control