老采空区瓦斯储量预测方法研究

以采动上覆瓦斯卸压运移的“三带”理论为基础确定了老采空区瓦斯的赋存范围，给出了考虑覆岩关键层结构的导气裂隙带和卸压解吸带高度计算方法。根据老采空区瓦斯来源，利用分源法建立了基于瓦斯卸压运移“三带”理论的老采空区瓦斯储量预测模型。结合阳泉三矿K8108综放工作面的生产地质条件，对K8108综放工作面覆岩导气裂隙带和卸压解吸带高度进行了计算，其覆岩导气裂隙带和卸压解吸带高度分别为115.3和157.7 m。利用老采空区瓦斯储量预测模型对K8108综放工作面老采空区瓦斯储量进行预测，该工作面老采空区瓦斯储量预计为3 078万m3。同时，利用物质平衡法对模型预测结果进行了验证，结果表明，两种方法的计算结果相差较小。

Study on computing method of old goaf methane reserves

Based on the “three zone” theory of relieved methane delivery the existing scope of old goaf methane was obtained.The height of methane conductive zone and the methane pressure relief zone were given by considering key strata structure.According to the sources of old goaf methane，reservation calculation model of methane in old goaf was built.The height of methane conductive fracture zone and methane pressure relief zone were calculated based on geological condition of K8108 working face.The results illustrate that the height of methane conductive zone and methane pressure relief zone of K8108 workface are 115.3 m and 157.7 m respectively.Methane reservation in old goaf of K8108 working face is predicted by reservation calculation model.And finally，the predicted methane reservation is 30.78 million m3 which is validated by material balance method.