Study on reasonable grouting parameters based on UDEC numerical simulation Fengfeng Yang, Liping Bai, Ruiqing Su, Jufeng Zhang, Tai Xu, Chao Zheng, Xiulan Zhu and Jing Chen E3S Web Conf., 118 (2019) 02013 Published online: 04 October 2019 DOI: 10.1051/e3sconf/201911802013