Multi-Rock Mass Classification Systems for the Assessment of Excavation Method and Support Design of Spillway Tunnel, Sidan Dam, Bali, IndonesiaBenny Arianto, I. Gde Budi Indrawan and I. Wayan WarmadaE3S Web Conf., 468 (2023) 02004DOI: https://doi.org/10.1051/e3sconf/202346802004