Tunnels: Luzzone Chamber

Case study: SOFO System

Tunnel Monitoring
Rock deformation Measurements
Multi-point Extensometers

Project Description

Summary: Tunnel construction by blasting, multi-point sensors, convergence monitoring during successive construction phases

Clients: OFIMA SA

Place: Ticino Canton (Switzerland)

Period: 1997 - N/A

Installation: IMM SA

Structure's short description: The tunnel is used as compensation chamber for the Luzzone hydropower plant. Due the dam raising it was necessary to enlarge this chamber.

Aim of monitoring: The SOFO sensors were installed radialy in order to measure the rock deformations during the different phases of construction.

Number of sensor: 8

Main Results: The recorded deformations were used to optimize the thickness of the shotcrete lining.

Installation of the connection box.

Bibliography:

SOFO?: Monitoraggio di opere del genio civile tramite sensori a fibre ottiche, G. Ballerini, D. Inaudi, S. Vurpillot, ARCHI, architettura e ingegneria, ed. Casagrande, Nr. 1, p 74 -80, 1998

Verformungsmessungen mit optischen Glasfasersensoren , N. Casanova, Messen in der Geotechnik 98, IGB-TUBS Braunschweig - Institut f? Grundbau und Bodenmechanik Fachseminar, Germany, p 1-14, 1998

SOFO?: Tunnel monitoring with fiber optic sensors , D. Inaudi, N. Casanova, G. Steinmann, J-F. Mathier, G. Martinola, Reducing Risk in Tunnel Design and Construction, ITC publisher, p 25-36, 1998

Fibre Optic Methods for Structural Health Monitoring , Branko Glisic and Daniele Inaudi, Johh Wiley & Sons, Ltd, 2007