Engineering geological characterisation of rock masses for design of excavation method and support system of Tanju Tunnel, West Nusa Tenggara, Indonesia
نویسندگان
چکیده
This paper presents experiences with design and construction process of the Tanju Tunnel, West Nusa Tenggara. The objective this research was to characterize volcanic intrusive rock masses for designs tunnel excavation method support system. Engineering geological investigations were carried out, upon which stand-up time estimated system determined based on mass classifications RMR (Bieniawski, 1989). investigation results showed that area consisted colluvium, andesite, tuff breccia. dominated by had UCS intact ranging from 200 300 MPa classified as strong rock. Based value, andesite a good quality mass. unsupported roof approximately 20.000 hours 3 m span. recommended full face, 1.0-1.5 advance, complete 20 while systems locally bolt in crown long 2.5 spacing, occasional wire mesh, 50 mm thick shotcrete where required.
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ژورنال
عنوان ژورنال: E3S web of conferences
سال: 2021
ISSN: ['2555-0403', '2267-1242']
DOI: https://doi.org/10.1051/e3sconf/202132501004