Presentation of Technical Guide: Instrumentation and Auscultation in the Design and Construction of Urban Tunnels

Diego Martínez Sánchez, Civil Engineer of INECO, and member of WG 11-20 about Urban Problems. Underground Solutions was in charge of presenting the Technical Guide on Instrumentation and Auscultation in the Design and Construction of Urban Tunnels at the AETOS 40th Anniversary Commemorative Conference.

During his presentation, which can be downloaded through the following link, Diego insisted on the purposes, importance and stages of the auscultation projects that are included in this Technical Guide, which has permanently had among its objectives the usefulness and practical approach within the characteristics that a technical document such as the one we are dealing with must have.

Purpose of the Technical Guide

- To outline the techniques available for instrumentation and monitoring of tunnel works and affected ground.
- Show the problems of measurement, calibration and use of the different types of sensors.
- Give examples of the most common monitoring plans for underground works and typical sections.
- Point out the possibilities of using point and automated measurements and the management of the latter.
- Comment that the instrumentation does not end when the construction work does, but must be designed (at least in part) to know the behaviour of the construction work in
in service.

Auscultation-of-Tunnels-AETOS_EDITED_v1Importance of auscultation:

- Nowadays, auscultation has become a powerful tool at the service of engineering, responding to the need to know and adequately control the behaviour of our works.
the behaviour of our works.
- In tunnels, auscultation takes on particular importance, since their design is generally based on empirical methods or theoretical calculations, according to complex and somewhat uncertain models. There are also large uncertainties in the properties and behaviour of the ground.
- Auscultation provides information of great value (excavation and conditions), being of greater relevance in urban environments. This will enable decision making and the design and implementation of corrective measures if necessary.

Stages of monitoring projects:

- Definition of the magnitudes to be measured, specifying the parameters of the phenomenon to be controlled, such as its range or the necessary precision in the measurements.
- Definition of the most suitable devices to be installed, not only to fulfil the mission entrusted in the previous section, but also to do so in the most appropriate way possible in terms of robustness, durability, instrument reading system, etc.
reading system, etc.
- Installation of the devices on site. This phase must be carried out by specialists in the field, in close contact with the Contractor.
- Monitoring of the auscultation system implemented, in accordance with the established reading frequency criteria.
- Engineering interpretation of the results.

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Comunicamos la triste noticia del fallecimiento el pasado día 1 de diciembre de D. Rolando Justa Cámara, Ingeniero de Caminos, Canales y Puertos y miembro activo de AETOS, con una participación destacada en varios Grupos de Trabajo y como profesor del Máster en Túneles y Obras Subterráneas.

Lo echaremos de menos. D.E.P.