PSI - Issue 64

Lorenzo Brezzi et al. / Procedia Structural Integrity 64 (2024) 1589–1596 Author name / Structural Integrity Procedia 00 (2019) 000–000

1595

7

A1 - Deformation w.r.t. 14/12/2023

A1 - Deformation w.r.t. 05/10/2023

0

0

5

5

10

10

15

15

20

20

Depth [m]

Depth [m]

25

25

a)

b)

30

-450 -300 -150 0 150 300 450 Strain 30

-450 -300 -150 0 150 300 450 Strain

14/12/2023 Up-Down 18/01/2024 Up-Down 07/02/2024 Up-Down 21/03/2024 Up-Down

14/12/2023 Down-Up 18/01/2024 Down-Up 07/02/2024 Down-Up 21/03/2024 Down-Up

Fig. 5. Strain measured in anchor A1 with different reference measurements: (a) 05/10/2023, (b) 14/12/2023. The plots use a solid line for the fiber portion from top to bottom ( up-down ) and a dashed line for the portion from bottom to top ( down-up ).

A2 - Deformation w.r.t. 14/12/2023

A3 - Deformation w.r.t. 18/01/2024

0

0

5

5

10

10

15

15

20

20

Depth [m]

Depth [m]

25

25

a)

b)

30

-450 -300 -150 0 150 300 450 Strain 30

-450 -300 -150 0 150 300 450 Strain

18/01/2024 Up-Down 07/02/2024 Up-Down 21/03/2024 Up-Down

18/01/2024 Down-Up 07/02/2024 Down-Up 21/03/2024 Down-Up

Fig. 6. Strain measured in anchors (a) A2 and (b) A3 with time (dd/mm/yyyy). The plots use a solid line for the fiber portion from top to bottom ( up-down ) and a dashed line for the portion from bottom to top ( down-up )

Finally, concerning A3 (Fig. 6b), a slight relaxation of the strain is visible in the external 15 m, related to the period 27/10/2023 and 07/02/2024. After this reading, the measurement of March 2024 underlines a slight activation of the anchor in the external 20 m of bar. Again, the strain rate is quite small, around 150 μ ε . It is important to note that the results presented are preliminary, therefore no definitive conclusions can be drawn. Nevertheless, the strain levels remain sufficiently low to confirm the continued operational conditions of the stabilization system. Additionally, based on the experience of the Fantoni landslide, it is evident that the strain level in anchor groups is influenced by stress redistribution among the reinforcements, suggesting a group effect. Unfortunately, this aspect cannot be thoroughly investigated in the case of the Paradisi landslide, as not all anchors are instrumented. However, as a general