为了识别覆岩应力及颗粒粒径对破碎煤体渗透的影响效应,通过承压破碎遗煤的渗流实验,得到了应力逐级加载过程中渗透率与加载应力、粒径、渗流梯度间的关系.结果表明:1)承压破碎颗粒煤的应力-应变曲线具有明显的阶段特征,在0~6 MPa区间快速压实,在6~12 MPa区间缓慢压实,12 MPa后压实效应微弱.2)测试过程中煤样的空隙率、渗透率随应力增大逐渐降低;而偏达西因子始终为负值,其绝对值随应力增加而增加.3)在相同轴向应力加载下,空隙率、渗透率随颗粒粒径的增加而降低,而其衰减系数随颗粒粒径的增加而增加.4)在应力加载过程中煤样内部物理结构发生变化,造成煤样的粒级构成变化,致使破碎分形维数增加,颗粒煤出现再次破碎,进而影响其渗透行为.5)通过承压破碎煤体渗流实验,说明采空区应力的逐渐恢复,将造成遗煤堆积区的空隙率、渗透率不断下降;通过降低煤体的破碎度、减少小颗粒比重有助于降低空隙率及渗透率,进而有利于煤自燃防治. In order to identify the effect of overlying strata stress and particle size on the permeability of broken coal, the relationship between permeability and loading stress, particle size and seepage gradient was obtained through the seepage experiment of pressure-bearing and crushing coal residue. The results show that: 1) The stress-strain curve of the coal with pressure-fractured particles has obvious stage features, compacted rapidly in the range of 0-6 MPa and slowly compacted in the range of 6-12 MPa, with a weak compaction effect after 12 MPa. 2) During the test, the porosity and permeability of the coal sample gradually decrease with increasing stress, while the partial Darcy factor is always negative, and its absolute value increases with the increase of stress.3) Under the same axial stress, Rate and permeability decrease with the increase of particle size, while the attenuation coefficient increases with the increase of particle size.4) The internal physical structure of coal sample changes during stress loading, resulting in the change of particle size composition of coal sample, Which leads to the increase of fractal dimension and the breakage of coal particles, which in turn will affect their infiltration.5) Through the seepage test of the coal by pressure-bearing fracturing, the gradual recovery of stress in the mined-out area will result in the increase of porosity and permeability Declining rate; passed A low degree of coal fragmentation body, help to reduce the proportion of small particles to reduce porosity and permeability, thereby facilitating prevention of spontaneous combustion of coal.