Designing excavation method and support system of Bintang Bano irrigation tunnel, Sumbawa Barat, Nusa Tenggara Barat based on Rock Mass Rating (RMR)Dinda W. Setiarini, Doni P.E. Putra and I. Gde B. IndrawanE3S Web Conf., 468 (2023) 02001DOI: https://doi.org/10.1051/e3sconf/202346802001