煤田地质与勘探2025，Vol.53Issue(6)：143-155,13.DOI:10.12363/issn.1001-1986.25.02.0109
煤矿采空区间隔条带充填CO2矿化封存及其关键技术
Backfill-strip mining and CO2 mineralization sequestration in coal mine goaves:A synergetic method and its key technologies
摘要
Abstract
[Objective]Coals serve as both the cornerstone of China's energy security and important industrial raw ma-terials.However,their mining and utilization tend to cause ecological and environmental problems such as CO2 emis-sions,the generation of solid wastes,and land subsidence.This necessitates reforming coal mining methods to promote the green,low-carbon,and sustainable development of China's coal industry.[Methods]Through the comparative ana-lysis of the conditions of CO2 sequestration in goaves corresponding to the caving,room-and-pillar(also known as knife-pillar),and backfill mining methods,this study developed a synergetic method for backfill-strip mining and CO2 miner-alization sequestration in goaves by combining the current status of technologies for geologic CO2 sequestration and coal mine backfill mining.With a typical coal mine in Shaanxi Province as a case study,this study conducted numerical sim-ulation experiments on damage to the overlying low-permeability,thick mudstone layer during backfill-strip mining.Based on the continuous and the foundation beam models,this study established a mechanical model of the cap rocks and a model for the mining-induced fracture heights.Additionally,key technologies for the synergetic method were pro-posed.[Results and Conclusions]Goaves formed under the caving and room-and-pillar mining are characterized by poor reservoir and cap rock conditions for CO2 storage,which tend to pose high leakage risks.In contrast,the backfill mining method can effectively protect cap rock integrity.However,it is necessary to reserve storage spaces if this meth-od is applied.The numerical simulation results indicated that the maximum subsidence of the upper boundary of the low-permeability,thick mudstone layer No.3 above the goaf were determined at 1 230 mm,520 mm,and 105 mm,respect-ively under backfilling rates of 0,50％,and 80％.As the backfilling rate increased,the low-permeability,thick mud-stone layer exhibited decreased subsidence amplitude and substantially reduced plastic deformation areas.Therefore,the integrity of the cap rocks can be ensured by optimizing the process and parameters of the strip-backfill mining.The mechanical model of a non-horizontal continuous beam with six spans under the condition of three mining-backfilling cycles was established,and the expressions for reaction forces and bending moments at pivot points were derived.Addi-tionally,the model for the mining-induced fracture heights was constructed.To achieve the practical application of the synergetic method,it is necessary to make breakthroughs in key technologies including geological siting,the building and stability-orientated regulation of underground gas storage(UGS)facilities for CO2 sequestration,CO2 mineraliza-tion combined with desulfurization/denitrification for backfilling material preparation,and CO2 charging simulation and optimization,followed by the development of comprehensive schemes.This will offer new approaches for the green,low-carbon development of China's coal industry.关键词
煤矿采空区/CO2矿化/充填开采/盖层岩组/采动裂隙Key words
coal mine goaf/CO2 mineralization/backfill mining/cap rock/mining-induced fracture分类
矿业与冶金引用本文复制引用
朱梦博,刘浪,王双明,蔚保宁,荣若愚,张文忠,庄登登,贾奇锋..煤矿采空区间隔条带充填CO2矿化封存及其关键技术[J].煤田地质与勘探,2025,53(6):143-155,13.基金项目
国家自然科学基金项目(52204175,52378264) （52204175,52378264）
中国工程院战略研究与咨询项目(2024-XZ-24) （2024-XZ-24）
陕西省重点研发计划-"两链"融合重点专项(2023-LL-QY-07) （2023-LL-QY-07）
