Marão Tunnel - Instrumentation

Designation of the Works

A4/IP4 – Marão Tunnel – Execution of Marão Tunnel Eastern Section

Works Owner

Auto-Estrada do Marão, S.A.


Infratúnel – Construtores do Túnel do Marão, A.C.E.


Installation and monitoring of geotechnical and topographical instrumentation. About 16 surface marks, 11 targets, 2 piezometers, 6 extensometer gauges, 3 inclinometers and 113 convergence sections have been monitored. Preparaton of all geological cartography (mapping) and geotechnical characterization of the excavated surfaces. Preparation of daily and monthly follow-up reports.


Vila Real, Portugal

Start Date

May, 2009

Execution Period

25 months