中文摘要：

为研究冲击载荷作用下煤微观结构变化规律,采用低温液氮吸附实验对不同冲击荷载作用下王河煤矿煤样进行了试验研究,分析受不同冲击载荷作用下煤样的微观孔隙结构变化规律。结果表明：不同冲击载荷作用下煤样的微观孔隙结构会发生显著变化。当冲击载荷为68.21 MPa时,煤样部分中孔遭到破坏,煤样总孔容减小,微孔比表面积增加显著;当冲击荷载增加到120.64 MPa时,由于细颈瓶形状的微孔在冲击载荷作用下破坏,微孔比表面积所占比例明显减小,煤样孔容呈进一步减小趋势;可以认为在冲击载荷作用下,煤样微观结构从微孔向小孔、小孔向中孔及大孔转化,液氮吸附量持续减小。研究成果表明煤受外界冲击载荷作用会由于煤微观结构的变化进而影响煤瓦斯的赋存,煤开放孔的增加有利于煤矿瓦斯的抽放,对煤矿石门揭煤和煤松动爆破参数设计具有实用参考意义。

英文摘要：

In order to study the change law of coal microstructure under impact load,taking the low-temperature liquid nitrogen adsorption experiment on coal samples of Wanghe coal mine,a study was made on the micropore structure variation regularities of coal samples under different impact loads. Results show that there are significant differences in the microscopic pore structures of coal samples under different impact loads. The coal sample was destroyed in the hole,the total pore volume of coal sample decreased,and the specific surface area increased significantly under the impact load was 68. 21 MPa; when the impact load came to 120. 64 MPa,the specific surface area and pore volume of coal sample were both decreased because the impact load led to the destruction of micro flask shape. Therefore,it turns out that under the function of impact load on coal sample,the adsorption quantity of liquid nitrogen decreases continuously when the micro structure experienced a transformation from a micro pore to a small hole,a small hole to a middle hole and a large hole. The results state clearly that the occurrence of coal gas can be influenced when the external impact load brings changes in the micro structure of coal body,and the study results also have a practical reference on the design of rock crosscut coal uncovering and coal body loose blasting parameters.