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  Geotechnical Characteristics in Road Tunnels of Sierra Valle Fertil. San Juan, Argentina

  Sierra de Valle Fertil is a mountain range located in the west of Argentina (San Juan province). It is crossed by the National Road 150 by a length of 40 km that includes six bidirectional tunnels with a total length of 2000 meters. All tunnels have the same horseshoe shape cross section with an area of 70 m2. They were designed following criteria given by "Cross Section Design of Bidirectional Road Tunnels" (PIARC Report, 2004). The first three tunnels are excavated through soft sandstones with siltstones and shale (Middle Triassic). The next two are in slightly cemented sandstones and conglomerates (Lower Triassic) and the last is in rigid greywacke (Upper Carbonic). The support provided by the design was estimated by using RMR and Q method.

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