Cbm sealed condition is bad under neutral plane at axial part where shows tensile stress in syncline structure 向斜中和面以下表现为拉张应力,向斜轴部中和面以下的煤层甲烷封存较差。
Cbm is easy to escape over the neutral plane where shows tensile stress in antiform ; cbm accumulates under the neutral plane 背斜构造中和面以上表现为拉张应力,煤层气容易逸散,中和面以下煤层甲烷聚集。
By means of stress - strain feature of upper and lower strata of fold neutral plane in the course of longitudinal fold formation , the differences between the upper coal bed and lower coal bed of fold neutral plane are analyzed from the coal thickness , coal structure , coal body structure , coalbed gas occurrence and diversities etc . , revealing the cause of these appearances 摘要利用纵弯褶皱变形中中和面上下岩层的不同应力与应变特点,分析了处于褶皱中和面上下各煤层在背斜与向斜部位煤层厚度、煤层构造、煤体结构及煤层瓦斯的赋存规律与差异性,揭示了这些现象产生的原因。