ABSTRACT
The section analysed in this paper is situated in garden “Alexandre I” in the west side of Toulon at chainage PM 882.
2.1 Instrumentation
The instruments set up from the surface in the section are (see Fig. 2.1):
− 2 inclinometers, 52 m deep, on both sides of the tunnel and 13 m from the axis;
− 1 vertical extensometer on the tunnel axis, 20 m long;
− 3 target prisms close to the previous instruments. The instruments set up from the tunnel are: − 4 radial extensometers, 13 m long; − 6 vibrating strain gauges placed on the steel rib; − 5 pressure cells; − Convergence targets.
