Geotechnical problems in Sierra Valle Fertil road crossing
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Date
2015Author
Rocca, Ricardo J.
Zeballos, Marcelo E.
Cieri Aceituno, Paula
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National Road 150 passes through the central region of Argentina and is
part of a bi-oceanic corridor from Brazil to Chile. In Sierra de Valle Fertil it has
traversed sedimentary rock formations where they have built five bridges and six
tunnels. During construction, instabilities phenomena were seen in both tunnels
and surface works. In tunnels different behaviors were observed on hard rock and
soft rock. Slope instability processes include mass displacement and failures due to
decompression generated by excavation. Some reported cases occured during the
execution of the work, including various types of failures. In many sectors, rock
masses showed a high degree of weathering. Analyses for the design and
mitigation actions undertaken are described. Details emerged in the foundation of
the bridges that make the section also arise.