Effects of Landslide Sliding Surface Characteristics on the Impact Force on Rigid Structures
Publication: Geo-Congress 2024
ABSTRACT
Understanding the deformation mechanisms and the impact forces generated by landslides is important for risk assessment and for implementing adequate mitigation measures. This work studies the effects of the basal surface characteristics on the impact forces exerted by a compound landslide mass on a rigid vertical wall. A generic model of a biplanar compound landslide is numerically analyzed using the material point method (MPM). MPM allows the study of the entire instability process, that is, failure initiation, propagation, and impact on the wall. In the present study, different curvatures of the slope transition along the basal surface are considered, including a sharp transition (i.e., kink). Different geometries develop different internal shearing mechanisms. Impact forces on a vertical rigid wall are compared for the different geometries, and that impact forces decrease as the curvature of the transition increases. Ultimately, the biplanar geometry with a sharp transition presents the lowest impact forces on the wall. This is consistent with the fact that a higher amount of energy is internally dissipated during the sliding process in a sharp biplanar transition compared to a curved one. The presence of friction on the sliding surface is also evaluated. The results show that the higher the basal friction resistance, the lower the maximum impact forces for all the slope geometries, but the differences between rounded vs. sharp transitions are more prominent.
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Information & Authors
Information
Published In
Geo-Congress 2024
Pages: 224 - 234
History
Published online: Feb 22, 2024
ASCE Technical Topics:
- Continuum mechanics
- Curvature
- Deformation (mechanics)
- Design (by type)
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Forces (type)
- Friction
- Geohazards
- Geomechanics
- Geometrics
- Geometry
- Geotechnical engineering
- Highway and road design
- Impact forces
- Landslides
- Mathematics
- Sliding effects
- Slopes
- Solid mechanics
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Walls
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