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煤岩超微孔隙结构对煤的吸附和强度性能起到非常重要的决定作用.为了对其进行精确测定,采用了高精度压汞仪对来自8种不同硬度的煤样进行压汞法实验,测定得出超微孔隙结构的所有特征参数.根据压汞法基本原理和分形几何学理论建立了切合实际的煤孔隙分形维数计算模型,利用孔隙特征参数计算出各硬度的孔隙结构分形维数.研究发现:煤孔隙结构具有很好的分形特征,煤体越松软,分形性越好,用分形规律研究煤岩孔隙结构越精确;随着煤体硬度的增加,孔隙分形维数不断降低,煤体抗压强度不断增大;建立硬度与孔隙分形维数之间的定量关系式,可以用硬度定量描述煤的吸附性和抗压强度.研究结论对于煤层瓦斯的运移、瓦斯抽放以及瓦斯突出均有着极为重要的意义.
The microporous structure of coal and rock plays an important role in the adsorption and strength of coal.In order to measure the coal accurately, mercury intrusion porosimetry was used to test the coal samples from eight different hardness, All the characteristic parameters of the micropore structure were determined.A practical computational model of pore fractal dimension of coal was established according to the mercury porosimetry principle and the fractal geometry theory.The pore structure fractal dimension of each hardness It is found that the pore structure of coal has a good fractal characteristic, the softer the coal, the better the fractal property, the more accurate the pore structure of coal and rock is studied by the fractal rule. With the increase of the hardness of coal, the fractal dimension of the pore decreases, The compressive strength of coal is increasing, and the quantitative relationship between hardness and pore fractal dimension can be established, and the hardness can be used to describe the adsorption and compressive strength of coal quantitatively.Research conclusions are of great significance for the research on gas migration, gas drainage, Gas outburst has a very important significance.