Application of Narrow Coal Pillar Roadway Protection Technology in Fully-mechanized Caving Face of Thick Coal Seam in Jingfang Coal Industry Co.,Ltd.
In order to achieve fine mining and improve production efficiency,Jingfang Coal Industry Co.,Ltd.intended to conduct an application test of narrow coal pillar excavation along the gob.With 3-509 fully-mechanized caving face as the engineering background,the study on coal pillar setting and roadway support scheme was carried out by means of numerical simulation and engineering analogy.The results showed that when the coal pillar width was 7 m,the surrounding rock stress of gob side roadway was conducive to its stability,and the surface deformation was generally small;the combined support scheme of"anchor bolt+anchor cable"designed according to the numerical simulation results had remarkable control effect on surrounding rock in the practical stage,and the supporting performance of anchor bolt was fully brought into play,which can ensure the overall stability of surrounding rock of gob side roadway.