不同压制负荷重塑煤体饱和渗透系数研究
Study on saturated permeability coefficient of remolded coal under different pressing loads
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摘要: 为研究不同压制负荷对煤体渗透特性的影响，采用不同压制负荷下形成的重塑煤样，通过自主设计的常水头渗透实验装置，对不同载荷下形成的重塑煤样的孔隙结构和渗透特性进行了探讨。研究结果表明：随着压制负荷的增大，重塑煤样的孔隙率逐渐减小，微孔和小孔占孔隙总体积的比例逐渐增加；各重塑煤样的含水率随时间先快速增加，后逐渐缓慢增加并趋于稳定，重塑煤样的饱和含水率随着压制负荷的增大而减小，饱和含水率和压制负荷之间符合单调递减有极值函数关系；重塑煤样的饱和渗透系数随着压制负荷的增大而逐渐减小。Abstract: In order to study the permeability characteristics of coal, remolded coal samples formed under different pressing loads were used. The saturated water content and saturated permeability coefficient of remolded coal samples were measured and analyzed by self-designed constant head permeability experimental device. The results show that: with the increase of pressing load, the total pore volume of remolded coal sample decreases gradually, and the proportion of micropores and small holes in the total pore volume increases gradually; the moisture content of each remolded coal sample first increases rapidly with time, then gradually increases slowly and tends to be stable. The saturated moisture content of remolded coal sample decreases with the increase of pressing load. The relationship between saturated moisture content and pressing load conforms to monotonic decline and has an extreme value function; the saturated permeability coefficient of remolded coal decreases with the increase of compaction load.
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