为了研究相似材料中煤粉粒径的选取对水力压裂效果的影响,运用室内水力压裂试验系统,以不同粒径煤粉成型的试样为压裂对象,在同应力同压裂液排量的条件下,开展了水力压裂试验。研究结果表明,煤粉粒径越大,成型的试样的破裂压力越大,破裂区域越大,水力裂缝扩展路径越平直。煤粉粒径越小,试样压裂时水力裂缝的扩展易受到煤粉的作用,扩展路径变得复杂。 In order to study the effect of coal particle size selection on the hydraulic fracturing effect in similar materials, an indoor hydraulic fracturing test system was used. Specimens with different particle sizes pulverized coal were used as fracturing targets. Hydraulic fracturing test was carried out. The results show that the larger the particle size of pulverized coal is, the larger the fracture pressure of the formed sample is. The larger the cracked area is, the more flat the hydraulic crack propagation path is. The smaller the coal particle size is, the more the hydraulic fractures expand when the sample is fractured, and the expanded path becomes more complicated.