Monitoring and survey for testing the stability of a hydraulic engineering

The paper describes the survey stages of a masonry bridle, located in the ravine Gennarini-Leucaspide near Statte (Ta), part of a group of three bridle for the protection of the railway line along the SS 7. The intent is to check the charge condition of stability of the structure as it is no longer included in the left bank, it is subject to phenomena of soil excavating, compromising the static and causing partial collapse. These collapses, probably linked to the erosion of a portion of land for the movement of water, occurred on the structure since the year 1996 as a result of flood. It was designed a monitoring plan for one year to determine the horizontal and vertical hanging of both upstream and downstream of the bridle, in order to define the parameters of variation of the safety factor over time, especially in the alternation of rain and dry periods. Were carried out meticulous topographical surveys with traditional techniques using the total station Leica TS30 supplemented by framing operations through local GPS measurements and modeling of the structure through terrestrial laser scanner survey.