保德煤矿8号未开采煤层瓦斯涌出的地质因素分析

Geologic factors analysis of gas inrush of 8#unmined coal seam in Baode Coal Mine

保德煤矿3盘区8号煤层逐渐向深部区开采,瓦斯含量逐渐增大,为解决深部区8号未开采煤层的安全开采问题,系统分析影响瓦斯赋存的地质因素,基于现场实测基础数据,采用灰色关联方法,对各影响因素(埋深、煤厚、变质程度、顶板砂泥比、底板砂泥比、地质构造、冲刷情况)进行预测分析,建立灰色关联模型,并计算出各项因素的关联度,得到影响瓦斯赋存的主控因素。研究结果表明,影响8号煤层瓦斯赋存的主要地质因素为地质构造、冲刷等因素。利用多元回归方法建立瓦斯含量预测模型方程y=3.2429+0.0047x_(1)+0.0079x_(2)-0.0180x_(3)+0.0016x_(4)-0.0215x_(5)+0.4641x_(6)+0.2001x_(7),预测模型具有较高的拟合度。

With 8#coal gradually mining to deep area in the 3 Panqu of Baode coal mine,the content of gas is gradually increased.In order to solve the problem of safe mining of 8#unmined coal seam in deep area,the geological factors affecting gas occurrence are systematically analyzed.Based on the field measured basic data,the grey correlation method is used.The influential factors(buried depth,coal thickness,metamorphic degree,roof sand mud ratio,floor sand mud ratio,geological structure,erosion condition)are predicted and analyzed,the grey relational model is established,the correlation degree of each factor is calculated,and the main controlling factors of gas occurrence are obtained,The results show that:The main geological factors affecting gas occurrence in 8#coal seam are geological structure and erosion.Multiple regression method is used to establish gas content prediction model equation y=3.2429+0.0047x_(1)+0.0079x_(2)-0.0180x_(3)+0.0016x_(4)-0.0215x_(5)+0.4641x_(6)+0.2001x_(7).The model has a high degree of fitting.