Development Of Abandoned Mines To Utilize Gas Potential And Safety Evaluation

After the mine is shut down or abandoned,its internal gas resources are still relatively rich,and if the secondary development and utilization of gas is not carried out,it will cause huge waste of resources,and will also bring serious safety,environmental and social problems.Therefore,it is necessary to develop and utilize the gas resources in abandoned mines,and how to estimate the amount of resources and analyze the potential is the basic condition for development and utilization.Based on this,the research in this paper mainly includes:(1)Understand the characteristics of waste mine gas storage and the law of transportation,improve the previous gas resource estimation method,and combine this method to estimate the gas resource amount of an abandoned mine in the Huo xi coalfield.(2)The influencing factors of the development and utilization potential of waste mine gas resources are analyzed,and the analysis model of gas resource development and utilization potential of 4 primary indicators and 20 secondary indicators is constructed by using the hierarchical analysis method,of which the first-level indicators are gas resource quantity factors,storage factors,gas resource development factors and economic factors,and after quantitative assignment of index parameters,combined with the fuzzy comprehensive evaluation method,a one-factor fuzzy comprehensive evaluation matrix is established to construct a comment set.The gas resource development potential of an abandoned mine in the Hoshi coalfield was analyzed.(3)Taking geological factors,technical factors,empirical factors and safety management factors as the evaluation unit,the safety checklist method was used to evaluate the risks existing in the development and utilization of waste mine gas resources in the Hoshi Coalfield,and the corresponding safety precautions were proposed.Through the above research,it is found that the free state gas in the bottom plate fracture zone cannot be ignored,and the gas resources of an abandoned mine in the Huo Xi coalfield are estimated by a perfect method,and the total amount can reach 477.704million m~3;the gas resource quantity factor,storage factor,gas resource development factor and economic factor are used as the first-level indicators,and the analysis index model of the potential of the development and utilization of waste mine gas resources is constructed,and the gas resource development and utilization potential level is"good"based on an abandoned mine in the Huo Xi coalfield as an example.Large-scale development can be carried out;the gas resource quantity factor and its storage factor have a greater impact on the development and utilization potential of the abandoned mine gas resources,followed by economic factors;in the process of the development and utilization of the gas resources of an abandoned mine in the Huo Xi Coalfield,the risk level ranking is from strong to weak:technical factors>geological factors>safety management factors>economic factors.