The Sierra de Valle Fertil is located in the west of Argentina (San Juan province). It is crossed by the National Road 150, that has 40 km in length including six bidirectional road tunnels with a total length of 2000 meters. The geological formations are various Carbonic-Permian (Paganzo Basin) and Triassic (Ischigualasto-Villa Union Basin) sedimentary rocks, in an area adjacent to the Ischigualasto Natural Park. The Sierra has been formed by the reactivation of the basin during the formation of the Andes (Pliocene-Pleistocene) with a thick-skinned tectonics. The trace of the route follows a creek that cuts anticlinal folds. The first three tunnels are developed through soft sandstones with siltstones and shales (middle Triassic). The two following slightly cemented sandstones and conglomerates (Lower Triassic) and the last is in rigid greywackes (upper Carbonic). The support provided by the design was estimated by using RMR and Q method. During construction geological surveys were conducted on the front as it was excavated, and expected support was adjusted according to them. Different failure modes observed in rigid and soft rock are analyzed together with the solutions provided during construction. The tunnels excavated in stiff rocks were less demanding than those provided for in the design. Instead, the tunnels in soft rocks required more supports than those stipulated in the design.
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ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014
September 9–13, 2014
Goiania, Brazil
Failure Modes in Road Tunnels of Sierra Valle Fertil. San Juan. Argentina Available to Purchase
Paula Aceituno Cieri;
Paula Aceituno Cieri
Direccion Nacional de Vialidad
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Roberto D. Martino;
Roberto D. Martino
Universidad Nacional de Cordoba
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Mauricio Giambastiani;
Mauricio Giambastiani
Universidad Nacional de Cordoba
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Ricardo J. Rocca
Ricardo J. Rocca
Universidad Nacional de Cordoba
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Paper presented at the ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014, Goiania, Brazil, September 2014.
Paper Number:
ISRM-SBMR-2014-015
Published:
September 09 2014
Citation
Cieri, Paula Aceituno, Martino , Roberto D., Giambastiani , Mauricio, and Ricardo J. Rocca. "Failure Modes in Road Tunnels of Sierra Valle Fertil. San Juan. Argentina." Paper presented at the ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014, Goiania, Brazil, September 2014.
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