废弃煤矿采空区瓦斯抽采可行性评价模型构建及应用

Construction and application of feasibility evaluation model for gas extraction in goafs of abandoned coal mines

在碳达峰碳中和的政策背景下,开发废弃煤矿瓦斯资源可产生较高的资源、经济与环境三重效益。通过调研及文献查阅,从技术可行性和经济合理性2个角度建立废弃煤矿采空区瓦斯抽采可行性评价指标体系,将博弈论组合赋权方法与模糊综合评价法结合,构建了博弈论−模糊综合评价模型,以晋城矿区废弃矿井古书院矿为例进行瓦斯抽采可行性评价。结果表明:一级指标中瓦斯资源条件及瓦斯保存条件的权重较高,分别为0.4391和0.3836,说明煤矿瓦斯赋存量和煤矿密闭性是影响废弃煤矿采空区瓦斯抽采可行性的决定因素;二级指标中,地面钻孔甲烷浓度和矿井涌水量权重较高,分别为0.091、0.087,说明废弃煤矿采空区瓦斯富集区的甲烷纯度及煤矿水害严重程度是影响废弃煤矿采空区瓦斯抽采可行性的关键因素;建立的评价模型修正了单一赋权评价法导致的权重失真问题,兼容了主客观定权重方法的优点;验证了博弈论−模糊综合评价模型应用于废弃煤矿采空区瓦斯抽采可行性评价的合理性。

Against the background of carbon neutrality and carbon peaking policy,the development of gas resources in abandoned coal mines can generate high resource,economic and environmental benefits.The evaluation index system is established through field research and literature review from technical feasibility and economic rationality aspects.The game theory-fuzzy comprehensive evaluation model is established by combining the weighting method of game theory with the fuzzy comprehensive evaluation method.The abandoned Gushuyuan Mine is used as an example to verify the rationality of the evaluation model.The weights of gas resource conditions and gas preservation conditions in the first-level indicators are as high as 0.4391 and 0.3836,indicating that coal mine gas storage and air tightness are the decisive factors influencing the feasibility of gas drainage in the goaf of abandoned coal mines.Among the secondary indicators,the weights of methane concentration of the ground borehole and the water inflow of the mine are as high as 0.091 and 0.087,indicating that the gas purity and the severity of water damage in the gas-rich areas of the abandoned coal mine goaf are the key factors affecting the feasibility of gas drainage.The established evaluation model corrects the weight distortion caused by the single weighting evaluation method,and it has the advantages of subjective and objective weight determination methods.The rationality of the game theory-fuzzy comprehensive evaluation model is proved.