PSI - Issue 62

Nicola Perilli et al. / Procedia Structural Integrity 62 (2024) 538–545 543 6 Nicola Perilli, Stefano Stacul, Massimiliano Lombardi, Nicola Nenci, Nunziante Squeglia / Structural Integrity Procedia 00 (2019) 000 – 000

target area, (b) the physiographic unit and the morphology of the site have been swapped, (c) the characterization of the geological context includes also the description of the lithotechnical units, (d) the information from literature about the landslide that threaten the bridge (documented / mapped landslide) and/or the information collected during the Periodic Field Survey of the Relevant Area and the surrounding part of the Geomorphological Significative Area are collected in the section Documented Landslide and Field Survey , (e) the four options available for the Recognized Hazardous Area (see Tab. 3) have been slightly modified and two options (namely: Landslide modelled and monitored; Presence of mitigation measures against the landslide) have been moved to the Secondary Parameters sub-section (see Tab. 4).

Table 3. Current version of Field Sheet Form according to the Italian Guidelines on existing bridges (LLG). Current Version of the Field Sheet Form according to the LLG

S ECTION

C ONTENTS AND O PTIONS

Morphology of the site (options: plain, plain at the base of the slopes, gentle slope, moderate slope, steep slope, crest ) Physiographical unit (options: mountainous, hilly, intermontane plain, low plain ) Hazard Class according to the Italian Landslide Hazard Map classification ( moderate, medium, high, very high, area of attention ) Options: (3a) Recognized landslide, but not studied, (3b) Recognized landslide, and studied, (3c) Modelled and Monitored landslide, (3d) Presence of mitigation measures against the landslide

(1) Geomorphological context

(2) Landslide hazard

(3) Recognized hazardous area

Formations Units 1 Units 2

(4) Geological context

Recognized / Identified Landslide Potential Landslide

(5) Type of phenomenon

Options: rock fall, topple, rotational slide, translational slide, flows, complex, deep-seated gravitational slope deformation Options: constant, retrogressive, enlarging, advancing, diminishing, confined, multidirectional Options: urbanized area, mining area, arable land, crops, riparian vegetation, reforestation, coppice, tall forest, uncultivated, shrubs and bushes, pasture meadow

(6) Type of movement

(7) Distribution of the activity

(8) Land Use

(9) Landslide morphometry (location of the instability on the slope) (10a) Parameter of the state of activity for the quantification of P A (Recognized landslides) Parameter of the degree of criticality for the quantification of P C (Potential landslides)

Options: high, medium, low, valley bottom

Options P A : Active, Inactive, Stabilized Options P C : highly critical, critical, slightly critical

(10b) Parameter of the landslide velocity, P V

Options: extremely rapid, rapid, moderate, slow, very slow

(10c) Parameter of the landslide size (magnitude), P M

Options: extremely large, large, medium, small, very small

(11a) Extent of the interference

Options: Total, Partial, Approach Zone

(11b) Overall Reliability of the parameters assessment

Options: Good, Limited