Research and application of dynamic sectionalized supporting in deep roadway under overhead mining

摘要

In this paper, the FLAC3D software was applied to analyze the dynamic sectionalized supporting technology and its application in deep roadway under overhead mining influenced by multi mining pressure.The conclusions are drawn as follows.The relative displacements between the roof, floor and ribs are affected apparently by the coal seam interval;The larger the coal seam interval is, the weaker the influence of dynamic pressure is, the smaller the deformation of surrounding rock and floor heave are, and the influence is increasing with the overlapping effects of the multi working faces mining;Plastic failure zones of surrounding rock are symmetrical distribution, and the plastic failure depth of roof is larger than that of floor;As the dynamic sectionalized supporting was adopted, the influences from different coal spacing are not significant,when mining at the same working face.Practice verified that dynamic sectionalized supporting can not only guarantee the stability of roadway, but also provide good supporting effect and greater economic benefit.