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Título del libro: From Fundamentals To Applications In Geotechnics
Título del capítulo: Comparison of Numerical Modeling and Measured Data for a Tunnel Built in Soft Rocks

Autores UNAM:

Autores externos:

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Año de publicación:
2015
Palabras clave:

Tunnel Numerical Modeling; Geotechnical Instrumentation; Stress State


Resumen:

A geotechnical numerical model of a section belonging to La Loma Tunnel located in the west zone of Mexico City is depicted in this paper. This road tunnel is placed in a hilly volcanic zone, composed essentially by pumice sand, tuff and lahar; it was dug in three stages using a roadheader machine and placing 30 cm thick permanent shotcrete lining. During the tunnel construction, instrumentation was carried out in a section, including the setup of strain-gauges and pressure cells in order to measure tangential strain in the lining and vertical stress under the strip foundation, respectively. Three numerical model variants, carried out by means of Finite Element Method using plane strain conditions, were developed considering different assumptions, the first one considers all the excavation stages and the evolution of mechanical properties of shotcrete, the second one takes into account also all the excavation stages but constant mechanical properties and the last one considers just one excavation stage and constant mechanical properties of shotcrete. The aim of this work was to compare the stress state in the shotcrete lining and foundation from modeling results with measured data obtained from instrumentation to be able to conclude about the most efficient model.


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