Abstract:
The concept of green mining in coal mines has been proposed for 20 years,and significant innovative pro⁃gress has been made in theoretical research and technical practice.However,there is still a gap between accurate quantitative prediction,efficiency improvement,cost reduction control,and actual production needs.This article elabo⁃rates on the technical framework for green mining of coal mines life cycle,and proposes several directions and sugges⁃tions for in⁃depth research on green mining.In terms of basic theory,we should follow the academic idea of“whole strata”in the key strata theory,conduct in⁃depth research on the cumulative effect of unloading and expansion of min⁃ing overlying strata and its impact on strata movement,establish a spatiotemporal dynamic model of the entire stra⁃ta movement from bottom to the surface,achieve quantitative prediction of mining stress,fractures,and subsidence,and ultimately form a digital twin model of strata movement under different geological mining conditions.In terms of tech⁃nology,it is necessary to fully utilize the laws of strata movement and research and develop low⁃cost green mining tech⁃nologies that are suitable for efficient production in coal mines.Specifically,one of the key research directions is the “one injection and five reductions”green mining solution.In response to the problem of insufficient coal mine fill⁃ing materials and the“dual carbon”goal,the“coal gangue+fly ash+CO 2”overburden isolated grout injection green mining technology is developed,Realize the“five reductions”of green mining effects,including reducing subsid⁃ence,reducing water leakage,reducing stress concentration and mining tremors,reducing solid waste emissions,and reducing CO 2 emissions.Another key direction that needs to be focused on is the restoration technology for min⁃ing damaged aquifers,especially in ecologically fragile mining areas in the western region(especially shallow coal seams),which needs to be given full attention.It is recommended to learn from post mining land reclamation and make aquifer restoration a necessary link through relevant technology and standard research,further implementing green mining of coal mine life cycle.