Abstract
Monitoring surface deformation on dams is commonly carried out by in situ geodetic surveying, which is time consuming and characterized by some limitations in space coverage and frequency. More recently microwave satellite-based technologies, such as advanced-DInSAR (Differential Synthetic Aperture Radar Interferometry), have allowed the integration and improvement of the observation capabilities of ground-based methods thanks to their effectiveness in collecting displacement measurements on many non-destructive control points, corresponding to radar reflecting targets. The availability of such a large number of points of measurement, which are distributed along the whole structure and are characterized by millimetric accuracy on displacement rates, can be profitably adopted for the calibration of numerical models. These models are implemented to simulate the structural behaviour of a dam under conditions of stress thus improving the ability to maintain safety standards. In this work, after having analysed how advanced DInSAR can effectively enhance the results from traditional monitoring systems that provide comparable accuracy measurements on a limited number of points, an FEM model of the Genzano di Lucania earth dam is developed and calibrated. This work is concentrated on the advanced DInSAR technique referred to as Small BAseline Subset (SBAS) approach, benefiting from its capability to generate deformation time series at full spatial resolution and from multi-sensor SAR data, to measure the vertical consolidation displacement of the Genzano di Lucania earth dam.
Highlights
The safety of large civil structures is assured by reliable design and construction approaches and through the constant control of its behaviour at different operational stages.it is important to measure the real values of the displacements to be compared with those expected and estimated during the design stage
The comparison between the results provided by the DInSAR technique and out the ones from data analyses, covering a period of 15 years was carried on the Genzano traditional methodologies usually applied for the dam monitoring is discussed in the following dam
A comparison was made between the historical displacement series measured from the extensometers columns 1-3-4 and the DinSAR displacements for the period 1992–2007 (Figure 15); the results show a good correspondence between the different measurement techniques
Summary
The safety of large civil structures is assured by reliable design and construction approaches and through the constant control of its behaviour at different operational stages. The lack of a Nowadays, many civil structures are monitored only superficially or even not monitored at all proper monitoring system increases the risk connected critical events and itThe does notofpermit (i.e., in some cases only visual inspection is adoptedto topotential control structure behaviour). Lack a an adequate level of knowledge of the the structural behaviour over time This absence information proper monitoring system increases risk connected to potential critical events and of it does not often permit leads to to be out of only an emergency phase well This as the difficulty an operations adequate level of carried knowledge theinstructural behaviour overastime. By adopting a systematic and of integrated monitoring approach (Figure 1), based both on ground.
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