To deeply study the variation characteristics of the gas content in the process of gas adsorption for coal samples under different gas pressures and confining pressures, low-field nuclear magnetic resonance technology was used to carry out experimental research on the gas adsorption of coal. The relationship between the T₂ spectrum amplitude integral and the gas quantity was analyzed. The results show the following: (1) When the samples were inflated for 11 h at each gas pressure point (0.31, 0.74, 1.11, and 1.46 MPa), after ∼5 h of adsorption, the amount of adsorbed gas exceeded 85.0% of the total adsorption capacity; additionally, as the adsorption time increased, the amount of adsorbed gas gradually tended to stabilize. When the gas pressure was >1 MPa, the amount of adsorbed gas exceeded 90.0% of the total adsorption capacity; Higher the pressure of aerated gas, greater the gas pressure gradient or concentration gradient on the surface of the coal sample and the greater the driving force for gas molecules to seep or diffuse into the coal sample. (2) When the samples were inflated for 11 h at each confining pressure point (3, 4, 5, and 7 MPa), the adsorbed gas increased by ∼85.0% of the total adsorbed gas in the first 5 h. When the pressure was <5 MPa, the amount of adsorbed gas exceeded 85.0% of the total amount of adsorption; that is, the increase in adsorbed gas was the largest at ∼5 h in the adsorption process for the columnar coal sample under different confining pressures, and the increase was ∼5.0% from 7–11 h. When the large pores in the coal sample closed, the amount of gas that seeped into the deep part of the coal sample within the same aeration time was reduced.

为深入研究不同瓦斯压力和围压下煤样吸附瓦斯过程中瓦斯含量的变化特征，采用低场核磁共振技术开展煤吸附瓦斯实验研究。T ₂之间的关系谱幅度积分和气体量进行分析。结果表明： (1) 样品在每个气压点(0.31、0.74、1.11和1.46 MPa)充气11 h，吸附约5 h后，吸附气体量超过85.0%。总吸附量；此外，随着吸附时间的增加，吸附气体量逐渐趋于稳定。当气体压力>1 MPa时，吸附气体量超过总吸附量的90.0%；充气气体压力越高，煤样表面的气体压力梯度或浓度梯度越大，气体分子渗入或扩散到煤样中的驱动力越大。(2) 试样在各围压点（3、4、5、7 MPa）充气11 h时，在前 5 小时内，吸附气体增加了总吸附气体的 85.0%。当压力<5 MPa时，吸附气体量超过吸附总量的85.0%；即不同围压下柱状煤样在吸附过程中~5 h吸附气体增加量最大，7~11 h增加~5.0%。当煤样中的大孔隙闭合时，在相同曝气时间内渗入煤样深部的气体量减少。不同围压下柱状煤样在吸附过程中~5h吸附气体增加量最大,7~11h增加~5.0%。当煤样中的大孔隙闭合时，在相同曝气时间内渗入煤样深部的气体量减少。不同围压下柱状煤样在吸附过程中~5h吸附气体增加量最大,7~11h增加~5.0%。当煤样中的大孔隙闭合时，在相同曝气时间内渗入煤样深部的气体量减少。