Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining

The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality effectiveness filling quarry. To study particles, continuous grading intermittent two different structures were designed to bulk particle size distribution. By conducting a side-limited uniaxial compression test on gangue, deformation parameters samples under axial pressure conditions calculated, interaction between was determined, compaction-re-crushing model established. following conclusions obtained, (1) displacement increment fractal dimension graded closely related structure skeletal particles; (2) stage can be divided into fast stage, slow stable stage—the is significantly elastic, more plastic, behavior approaches that original rock body; (3) degree crushing increases with an increase in stress, specimen mainly occurs stage; (4) compaction-crushing-fractal evolution lateral limit process established as line questioning. physical significance equation discussed this paper. provide theoretical support engineering guidance for precise quarry prevention later collapse.