粒径损伤对原生煤和构造煤孔隙结构与分形特征的影响*

为了分析构造煤与原生煤因孔隙结构不同而导致的内部瓦斯存储和运移所存在的差异性。结合低温液氮实验，分析2种煤样的孔隙特征参数与分形维数之间的关系，发现破碎作用对原生煤和构造煤孔隙的破坏路径略有区别。对于原生煤，破碎作用先作用于较大孔隙，之后对微孔产生影响；而对于构造煤，破碎作用直接对较大孔隙和微孔隙产生影响。研究结果表明:原生煤孔隙表面越粗糙、微孔比表面积越大，吸附能力越强；构造煤孔隙结构越复杂、微孔孔容越大，吸附能力越强。研究结果可为构造煤与瓦斯突出的防治提供研究基础。

Influence of particle size damage on pore structure and fractal characteristics of intact coal and tectonic coal

In order to analyze the difference of gas storage and migration between tectonic coal and intact coal due to different pore structure,in this paper,combined with the low-temperature liquid nitrogen experiment,it is found that the damage paths of the pores of intact coal and tectonic coal are slightly different.Larger pores in intact coal are affected by fragmentation,and then micropores are affected.For the intact coal,the fragmentation firstly acted on larger pores,and then affected the micropores.For the tectonic coal,the fragmentation directly affected larger pores and micropores.According to the relationship between pore characteristic parameters and fractal dimensions of intact coal and tectonic coal,it was proposed that the coarser the pore surface of intact coal and the larger the specific surface area of micropore,the stronger the adsorption capacity.The more complex the pore structure of tectonic coal and the larger the micropore volume,the stronger the adsorption capacity.The research results provide research basis for the prevention and control of tectonic coal and gas outburst.