A novel numerical analysis method for the stability of sediment void-type energy storage salt cavern and its application in Tai’an, China - Xiaopeng Liang; Xiuli Ding; Wanrui Hu; Hongling Ma; Shuling Huang; Xilin Shi; Rui Cai; Zhen Zeng; Xuan Wang (Tunnelling and Underground Space Technology, 2026)