In-situ rock tests for fault gouge zone:A case in Fengman hydropower station, China Xinchuan Xu, Zhaoyue Yu, Fangfang Xue, Xiaogang Long, Xinyu Mao, Changyan Ke, Yuefei Wang and Huanyu Meng E3S Web Conf., 293 (2021) 03008 Published online: 23 July 2021 DOI: 10.1051/e3sconf/202129303008