Engineering geological characteristics based on rock mass rating (RMR) and geological strength index (GSI) in Tunnel Number 1 of the Sigli-Aceh toll roadJabnes Satria, I Gde Budi Indrawan and Nugroho Imam SetiawanE3S Web Conf., 325 (2021) 01014DOI: https://doi.org/10.1051/e3sconf/202132501014