Affected by the superposition of working face mining. strong rock pressure phenomena such as rock burst and large deformation easily occur in the gob-side entry when mining extra-thick coal seams. Taking the extra-thick coal seam mining of Caojiatan Coal Mine in Yushen Mining Area as the engineering background. the appearance mechanism of strong mine pressure in gob-side entry is anal... https://pipingrockers.shop/product-category/black-walnut/