Study on unloading energy characteristics of limestone in different crossing sections Yilin Liao, Jianfeng Liu, Qiangxing Zhang, Zhicheng Li, Deng Xu and Anqi Zhu E3S Web Conf., 165 (2020) 03015 Published online: 01 May 2020 DOI: 10.1051/e3sconf/202016503015