Seite - 1271 - in Book of Full Papers - Symposium Hydro Engineering

 Topographic and bathymetric survey (sections, reports, photos)  Under water structure inspection (videos, photos, reports)  Dewatering inspection (videos, photos, reports)  Structural stability and safety Analysis (reports) 5.1.2. Inspection of current conditions Inspection of existing structures took place to provide any missing or doubtful data collected and integrated in the Database. Apart from data collection, the main purpose of this activity was to inspect the current situation of the existing structures indicating level of deterioration or inefficiency. The inspection covered the structural and the mechanical elements of the structure. The inspection programme included different types of inspection as follows: 1. Site visual inspection, collection of missing data for 153 structures. 2. Topographic and bathymetric survey for 150 structures summing a total survey area of 4.264.000 m2. 3. Underwater inspections for 192 vents in 48 structures. 4. Dewatering inspections for 19 vents in 15 structures. 5.1.3. Structural and Geotechnical investigations This is to estimate the current material strength after the age passed since construction in order to perform different technical analyses to check safety and stability of the structures. The decided tool to get this data was to take core samples from the piers and foundations of the existing structure. Structural and Geotechnical in-site investigations and lab tests for 94 structures have been executed by cores and boreholes summing 4877 m-long. 5.1.4. Analyses for Safety and Stability Calculations of factors of safety (FOS), for different stability checks, were done to assess the current safety level of the structures. The calculations were based on the material recent properties assessed by the structural and geotechnical investigations. After fulfillment of parameters requests from the site exploration programme, and the operation data of each regulator, numerical 3D modeling for each structure was carried out to explore the regions of stress concentrations. Implementing the concepts of soil structural interaction (Winckler Assumptions); and the variation of loading within the annual cycle and/or the lock operation was inducted into the model for analysis. 1271