废弃煤矿瓦斯资源量预测模型的构建与应用

准确预测废弃煤矿的瓦斯资源量及瓦斯资源类型，可以为其抽采可行性评价和抽采方案设计提供重要依据。以沈北煤田废弃的清水二矿为研究对象，针对矿井不同位置的煤炭剩余量、孔隙率、受采动影响程度和内部瓦斯赋存状态的差异，将矿井瓦斯资源划分成采空区、冒落带、裂隙带等裂隙空间中的游离态瓦斯和采动影响区、遗煤、邻近层、未采区的吸附态瓦斯7类，并分别建立了相应的瓦斯资源量预测数学模型。将清水二矿研究区划分为不同块段，分析各块段瓦斯资源的构成类型，并使用所建立的数学模型进行计算，得到了研究区整体的瓦斯资源量。结果表明，清水二矿的瓦斯资源总量为276×10⁶ m³，未采区的吸附态瓦斯含量最多，占比达到76.98%，邻近层卸压区域的吸附态瓦斯含量最少，占比不足1%；游离态瓦斯资源总量占比整体不超过10%，其中游离态瓦斯资源量占比裂隙带＞冒落带＞采空区。研究为废弃矿井瓦斯资源量的准确计算提供了一种方法。

Establishment and application of prediction model for gas resources in abandoned coal mines

Accurately predicting the amount of gas resources and the types of gas resources in abandoned coal mines can provide an important basis for the feasibility evaluation of their extraction and the design of extraction schemes.It was took the abandoned Qingshui No.2 Mine in the Shenbei Coalfield as the research object，the mine gas resources were divided into mined-out areas and gas-flooding areas according to the difference in coal remaining amount，porosity，degree of influence by mining and internal gas occurrence status at different locations of the mine.There were seven types of free gas in the fractured space such as the falling zone and the fracture zone and the adsorbed gas in the mining-affected area，remnant coal，adjacent layers，and unmined areas，and the corresponding mathematical models for prediction of gas resources had been established respectively.The study area of Qingshui No.2 Mine was divided into different sections，the composition types of gas resources in each section were analyzed，and the mathematical model established was used to calculate，and the overall gas resources of the study area were obtained.The results showed that the total amount of gas resources in Qingshui No.2 Mine was 276×10⁶ m³.The unmined area had the most adsorbed gas content，accounting for 76.98%，and the adjacent layer pressure relief area had the least adsorbed gas content，accounting for less than 1%；the total free gas resources accounted for no more than 10% of the total，of which the free gas resources accounted for the fracture zone＞caving zone＞goaf.The research provides a method for the accurate calculation of gas resources in abandoned mines.