Deformation Characteristics of Surrounding Rock in a Large Underground Opening Under High In Situ Stress and Complex Rock Mass Structures: A Case Study of Yebatan Hydropower Station - Peiyang Yu; Xiuli Ding; Shuling Huang; Peng-Zhi Pan; Yuting Zhang; Jianhua He; Ju He; Gang Han (Rock Mechanics and Rock Engineering, 2026)