Emergency response and critical technologies for large-diameter boreholes in mine rescue through surface drilling
[Objective]Large-diameter lifesaving holes have been successfully applied multiple times in mine rescue through surface drilling.However,they show limitations in emergency response like quick dispatch and cross-regional rescue,and their technological adaptability is insufficient to cope with complex strata.[Methods]From the perspective of overall emergency rescue,with rescue timeliness as an indicator,this study summarized the critical technologies like response capability enhancement and borehole-forming technology for complex strata.It constructed an emergency handling process for mine rescue through surface drilling,specified the improvements in contingency plan activation,re-sponse actions,and response speeds,and established the hierarchical cross-regional rescue dispatch mechanism and the pre-drilling technical support response mechanism.Based on the analysis of the drilling process characteristics of large-diameter lifesaving holes in unconsolidated strata and bedrock layers,this study proposed solutions to construction chal-lenges in complex strata characterized by fragmentation and high water inflow,and typical problems in the rescue lifting process.[Results and Conclusions]Key findings are as follows:(1)A scientific emergency response mechanism for mine rescue through surface drilling is a significant approach for improving rescue efficiency.The emergency response efficiency can be effectively increased by 2.3 times by employing the hierarchical cross-regional rescue dispatch mech-anism and the pre-drilling technical support response mechanism.(2)An efficient borehole-forming solution for large-diameter lifesaving holes under complex formation conditions is developed in this study.The solution is applied to the experimental project of the Jiudingshan mine in Jining City,completing a large-diameter lifesaving hole with a final drilling depth of 403.2 m,a diameter of 580 mm at the end location,and an average penetration rate of 2.5 m/h.The total duration from emergency response to rescue lifting takes 311.95 h,improving the overall rescue timeliness by 47%.(3)In terms of rescue timeliness,the efficiency improvement of the rescue preparation phase is superior to that of the im-plementation phase,with more achievable enhancement in the emergency response capability.Therefore,mine rescue teams are recommended to enhance emergency preparedness and rapid response capabilities in the case of limited en-hancement in drilling technology and equipment.The results of this study can be referenced for supplying surface emer-gency rescue for mines with mining depths shallower than 400 m,guiding mine rescue teams to establish emergency re-sponse mechanisms,and conducting construction design for large-diameter lifesaving holes,thus holding significant guiding implications for mine emergency rescue through surface drilling.
万方数据
维普
