A complex multi-sensor monitoring platform for the continuous control of an unstable slope affected by tunneling excavation, was realized between 2007 and 2008 after the first collapse of an already built tunnel entrance. The monitoring system was made of some inclinometric and piezometric sensors up to 70 m deep, a topographic system, a Terrestrial SAR Interferometer, a weather station, a photocamera and some load cells installed on bulkheads anchors. The continuous monitoring of the slope during different working phases (planning of stabilization works, realization of stabilizations works and tunneling excavation) allowed us to continuously control the slope behaviour, thus guaranteeing the operations in safety conditions. Data derived from the displacement monitoring, combined with geological and geomechanical information, allowed us to better define the complex engineering geological model of the slope, thus supporting the design of stabilization works. Furthermore, the real time control by TInSAR allowed us to stop the excavations of the tunnel for three times following the sudden increase of the slope displacement velocity. Stability thresholds of velocity and displacement have been also defined using semi-empirical models on the basis of the collected historical displacement data
