Control of backfill ratio in a short-wall green-intelligent mining working face to prevent pollution from coal-based solid waste: experimental and design studies on the relationship between two-dimensional images and volume of gangue - Yun Zhang; Yixuan Yang; Xingping Lai; Shenggen Cao; Yongzi Liu; Mingbo Chi; Defu Zhu; Baiyi Li; Di Wang; Jifeng Li (Journal of Cleaner Production, 2025)