中文摘要：

以大宁煤矿3#煤层的原生煤和构造煤为研究对象,以压汞实验结构为基础并结合分形维数理论,对原生煤和构造煤的孔隙结构特征进行了对比分析,研究发现：构造煤的进汞总量是原生煤的3倍左右;原生煤无滞后回线,孔隙形态主要以管状或者平板型孔为主;构造煤有明显滞后回线,孔隙形态以＂墨水瓶＂似的孔为主;原生煤只有一个突破压力,构造煤却有两个;原生煤分形维数特征关系曲线存在着一个突变点,而构造煤则存在两个突变点。综上可知,构造煤内孔隙结构更复杂、连通性更差,瓦斯更难运移,并且更容易遭受破坏。

英文摘要：

Based on pressure mercury method and fractal dimension theory, this research takes the primary coal and tectonically deformed coal of No.3 coal seam in Daning coal mine as the research objective. Pore structure characteristics of primary coal and tectonically deformed coal have been analyzed. The results showed that the injected mercury total amount of tectonically de- formed coal is 3 times than primary coal. The pressure mercury curve of primary coal does not have a hysteresis loop and the pore morphology mainly is tubular or flat hole. However, the pres- sure mercury curve of tectonically deformed coal has a hysteresis loop, and the pore morphology mainly is like that of an ＂ink bottle＂. Primary coal only has a breakthrough pressure, however, there are two breakthrough pressures in tectonically deformed coal. The fractal dimension feature relational curves of primary coal have a mutation point, and there are two mutation points in tec- tonically deformed coal. Therefore, the pore structure of tectonically deformed coal is more com- plex, with worsening connectivity. Gas migration in tectonically deformed coal is more difficult, and more vulnerable to be damaged.