FIG Peer Review Journal


Drilling a 25 km Tunnel for High Speed Railway in Spain (4542)

Jesus Velasco, Juan Prieto, Tomas Herrero and Jose Fabrega (Spain)
Prof. Jesus Velasco
Technical University of Madrid
Department of Engineering Surveying and Cartograph
Carretera de Valencia, km 7
Corresponding author Prof. Jesus Velasco (email: je_vel[at], tel.: + 34 91 336 7927)

[ abstract ] [ paper ] [ handouts ]

Published on the web 2010-01-14
Received 2009-11-19 / Accepted 2010-01-14
This paper is one of selection of papers published for the FIG Congress 2010 in Sydney, Australia and has undergone the FIG Peer Review Process.

FIG Congress 2010
ISBN 978-87-90907-87-7 ISSN 2308-3441


During last years some large high-speed railway tunnels have been built in Spain. To solve those projects, technical and scientific problems have been solved from the geodetic and surveying point of view. Those studies have allowed us to set a methodology that optimizes the performance of this kind of works in the world of Civil Engineering. We have applied our studies to the Tunnels of Pajares that are the second longest ones in Spain with a total longitude about 25 km. The studies summarizes the design of the geodetic networks to support the guidance of the TBMs used as well as the election of the observations to be done, the instrumental to be used and the observation and computation procedures to be followed. A special emphasis has been taken into account for the treatment of the uncertainty of the coordinates, displacements and breakthrough obtained during the drilling tasks. The article shows the results obtained and the conclusions that can be followed in order to successfully complete a similar project.
Keywords: Tunnel surveying; TBM; tunnel breakthrough; underground network; surface network; accuracy; gyrotheodolite azimuth