Velocity weakening and long-runout landslides: laboratory experiments and modelling approaches
| Název práce v češtině: | Velocity weakening and long-runout landslides: laboratory experiments and modelling approaches |
|---|---|
| Název v anglickém jazyce: | Velocity weakening and long-runout landslides: laboratory experiments and modelling approaches |
| Klíčová slova: | landslide, soil rheology |
| Klíčová slova anglicky: | landslide, soil rheology |
| Akademický rok vypsání: | 2025/2026 |
| Typ práce: | bakalářská práce |
| Jazyk práce: | angličtina |
| Ústav: | Ústav hydrogeologie, inženýrské geologie a užité geofyziky (31-450) |
| Vedoucí / školitel: | Gianvito Scaringi, Dr., Ph.D. |
| Řešitel: |
| Předběžná náplň práce |
| The shear resistance available at the base of a landslide body exerts a fundamental control on the evolution of its movement. This resistance can vary in time and along the basal surface (or shear zone) of the landslide body according to the nature of the sheared material, its stress-strain state and porosity, the amount of moisture, and the pressure of fluids in the pores. In addition, changes of temperature, chemistry, and shear velocity (or strain rate) can give rise to feedback mechanisms that can be responsible for long and slow shear creep phases or runaway, long-runout sliding. A transition between these two modes is also possible under certain mechanisms controlled by external constraints. In this thesis, the candidate will focus on two or more of the following tasks: - compile a state-of-the-art review on velocity-dependent and other feedback mechanisms on landslide movement, with a focus on experimental and field evidence of velocity weakening mechanisms associated with catastrophic sliding. - compile a state-of-the-art review on modeling approaches for long-runout landslides that account for velocity-weakening. - perform ring-shear experiments at various rates of shearing to identify velocity-weakening and/or -strengthening behaviors according to soil compositions. - develop or improve empirically-based friction laws and apply them to simulate a long-runout landslide. |
| Předběžná náplň práce v anglickém jazyce |
| The shear resistance available at the base of a landslide body exerts a fundamental control on the evolution of its movement. This resistance can vary in time and along the basal surface (or shear zone) of the landslide body according to the nature of the sheared material, its stress-strain state and porosity, the amount of moisture, and the pressure of fluids in the pores. In addition, changes of temperature, chemistry, and shear velocity (or strain rate) can give rise to feedback mechanisms that can be responsible for long and slow shear creep phases or runaway, long-runout sliding. A transition between these two modes is also possible under certain mechanisms controlled by external constraints. In this thesis, the candidate will focus on two or more of the following tasks: - compile a state-of-the-art review on velocity-dependent and other feedback mechanisms on landslide movement, with a focus on experimental and field evidence of velocity weakening mechanisms associated with catastrophic sliding. - compile a state-of-the-art review on modeling approaches for long-runout landslides that account for velocity-weakening. - perform ring-shear experiments at various rates of shearing to identify velocity-weakening and/or -strengthening behaviors according to soil compositions. - develop or improve empirically-based friction laws and apply them to simulate a long-runout landslide. |