Modelling of Coke Layer Collapse during Ore Charging in Ironmaking Blast Furnace by DEM Yoichi Narita, Hiroshi Mio, Takashi Orimoto and Seiji Nomura EPJ Web Conf., 140 (2017) 02018 Published online: 30 June 2017 DOI: 10.1051/epjconf/201714002018