刘大刚(LIU Dagang),doctor of engineering, associate professor and master supervisor of Southwest Jiaotong Uruversity, mainly engaged in the research of tunnel and underground engineering. In recent years, he has presided over more than 50 scientific research projects, won more than 20 scientific and technological awards, published more than 80 papers,participated in the compilation of 3 norms / regulations and 5 academic monographs.姜柏宇(JIANG Baiyu),bornin Neijiang, Sichuan Province in 1991,graduated from Environment and Civil Engineering School, Chengdu Uruversity of Technology, China in 2018, is a Ph.D. student at the Rutgers University, and participated in NSFC project "The nucro-parameter calculation method of the discrete element method of the surrounding rock of the tunnel sand.