PSI - Issue 64

Annalisa Mele et al. / Procedia Structural Integrity 64 (2024) 1295–1302 A. Mele et al./ Structural Integrity Procedia 00 (2023) 000 – 000

1301

7

for how structures are designed, reinforced, and retrofitted to withstand such movements. For instance, foundations may require additional lateral support, and buildings may need flexible joints to accommodate these shifts. The concurrence between predictive displacement models and the observed differential displacements validates the effectiveness of the DInSAR technique in capturing the nuanced behaviors of ground movement. This agreement is essential for trust in predictive modeling as a tool for planning and risk assessment. Finally, the cumulative displacement profiles at the building foundations for each year provide a view of how these ground movements are evolving over time. These profiles are indispensable for structural engineers, as they highlight potential zones of stress concentration and areas where the integrity of the building may be compromised.

Fig.6. Cumulative displacement profiles affecting foundations at the end of each year in the period 2012-2022.

6. Conclusions The findings of this research underscore the necessity of a combined approach to landslide monitoring and structural analysis. The study covers a densely populated urban area covering approximately 3 km², in which the areas of Moio and Pellare are specifically affected by significant ground movement. This movement has been quantified through precise satellite radar measurements that indicate substantial displacement rates. During the period 2019 2022, the cumulative displacements recorded along the horizontal planes east-west and north-south and the vertical plane have reached notable magnitudes. With horizontal displacements up to 7,5 cm, the lateral earth movement is pronounced. On the other hand, the vertical movements, peaking at 3,9 cm, while lower than the horizontal shifts, are still significant, particularly if they represent either a consistent uplift or subsidence of the ground. The observed trend over the years shows an increasing pattern in horizontal displacements until 2019 and a decreasing pattern until 2022. The structural health of the building's infills, as evidenced by the presence of millimeter-wide cracks, calls attention to the gradual yet persistent deformation forces exerted by the landslide. The infills have proven to be critical indicators of the early stages of deformation and potential points of failure. Moreover, the consistency between the predicted and observed displacement rates validates the predictive models used in the study. This concurrence is encouraging for the field, as it demonstrates the potential of DInSAR data in detecting, measuring and also anticipating ground movements with good accuracy. In conclusion, the research has illuminated the importance of remote sensing techniques in the prevention and mitigation of landslide risks. By calculating the displacements and constructing a damage model for the affected infills, the study provides a foundation for the management of structural safety in landslide-prone areas. The success of this approach paves the way for monitoring and mitigating the risks. It also calls for continued research in the field of remote sensing to improve the predictive capabilities of technologies in safeguarding human life and property against the threat of natural hazards.