Influence of filling–drawdown cycles of the Vajont reservoir on Mt. Toc slope stability

Paronuzzi, Paolo; Rigo, Elia; Bolla, Alberto

doi:10.1016/j.geomorph.2013.03.004

Cited by 189 publications

(76 citation statements)

References 28 publications

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“…A classic landslide that has been extensively studied is that of Vaiont; Hendron & Patton (1985), Müller (1964), Nonveiller (1987), Semenza (2001) and Paronuzzi et al (2013) provide detailed and informative contributions. Other large-scale catastrophic landslides associated with reservoir operations have been reported by Alcántara-Ayala & Domínguez-Morales (2008) (San Juan de Grijalva slide in Mexico, 2007); Wang et al (2004) and Dai et al (2004) (Qiangjianping slide in China, towards the reservoir of the Three Gorges Project, 2003); Chamot (1993), Plaza-Netos & Zevallos (1994), Schuster et al (2002) and Harden (2004) (La Josefina landslide, Ecuador, in 1993).…”

Section: Introductionmentioning

confidence: 99%

Thermo-poro-mechanical analysis of landslides: from creeping behaviour to catastrophic failure

2016

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The scope of the paper encompasses planar and compound sliding motions, which may exhibit creeping behaviour during a certain period but may evolve to a very rapid motion. Thermo-mechanical interactions, at the scale of the sliding surface, are accepted as a critical aspect to explain these motion phases and their relationship. The sliding kinetics and global equilibrium are described at a large scale and the evolving shearing strength at the sliding surface derives from the local analysis of the shearing band and its vicinity. Pore pressures, temperatures and related variables are calculated by resolving a set of balance equations. The paper describes the transition from creeping motions to a rapid event. Results are found in terms of dimensionless numbers. Calculation of the slide evolution requires special numerical techniques described in the paper. Band permeability is found to be the dominant property controlling the triggering of fast motions. The creeping stage and the eventual slide blow-up are intimately linked. This relationship is explored in the paper. The models presented can be readily used to back-analyse relevant case histories or, in principle, even to carry out predictive modelling, provided an adequate calibration is available for the material parameters.

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Section: Introductionmentioning

confidence: 99%

Thermo-poro-mechanical analysis of landslides: from creeping behaviour to catastrophic failure

2016

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“…Field investigations by Hendron and Patton (Hendron and Patton 1987) revealed that multiple clay layers with thickness between 0.5 and 10 cm exist close or along the sliding surface. Based on the geologic information, the strength characteristics and the available monitoring data, the rockslide has been studied by numerous investigators to reveal the controlling geologic constraints and the internal deformation (Belloni and Stefani 1987;Boon et al 1963;Paronuzzi et al 2013;Vacondio et al 2013;Chowdhury 1987;Corbyn 1982;Crosta and Agliardi 2003;Selli and Trevisan 1964;Rossi et al 1963;Müller-Salzburg 1964, 1987a. 2D analytical and numerical backcalculations estimated that the critical sliding friction angle is within a range of [17°, 23°] (Crosta et al 2007;Corbyn 1982;Mencl 1966;Nonveiller 1987), which is significantly higher than the measured residual friction angle of wet clay layer at the sliding surface [6°, 10°] (Hendron and Patton 1987).…”

Section: Introductionmentioning

confidence: 99%

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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This paper investigates the generation of hydrodynamic water waves due to rockslides plunging into a water reservoir. Quasi-3D DEM analyses in plane strain by a coupled DEM-CFD code are adopted to simulate the rockslide from its onset to the impact with the still water and the subsequent generation of the wave. The employed numerical tools and upscaling of hydraulic properties allow predicting a physical response in broad agreement with the observations notwithstanding the assumptions and characteristics of the adopted methods. The results obtained by the DEM-CFD coupled approach are compared to those published in the literature and those presented by Crosta et al. (Landslide spreading, impulse waves and modelling of the Vajont rockslide. Rock mechanics, 2014) in a companion paper obtained through an ALE-FEM method. Analyses performed along two cross sections are representative of the limit conditions of the eastern and western slope sectors. The max rockslide average velocity and the water wave velocity reach ca. 22 and 20 m/s, respectively. The maximum computed run up amounts to ca. 120 and 170 m for the eastern and western lobe cross sections, respectively. These values are reasonably similar to those recorded during the event (i.e. ca. 130 and 190 m, respectively). Therefore, the overall study lays out a possible DEM-CFD framework for the modelling of the generation of the hydrodynamic wave due to the impact of a rapid moving rockslide or rock-debris avalanche.

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“…The groundwater levels and pore water pressures in landslides are affected by the rates of variations in reservoir water levels [14] and by saturated permeability coefficients [15]. As a result, the landslide stability coefficient varies based on changes in the reservoir water level and saturated permeability coefficient [13,[16][17][18][19]. Notably, some studies have shown that the seepage fields and stability coefficients of reservoir landslides in the TGRA are affected by fluctuations in the reservoir water level [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Hydrodynamic Pressure Landslides with Different Permeability Coefficients Affected by Reservoir Water Level Fluctuations and Rainstorms

Huang

Luo

Liu

2017

Water

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Abstract:It is significant to study the variations in the stability coefficients of hydrodynamic pressure landslides with different permeability coefficients affected by reservoir water level fluctuations and rainstorms. The Sifangbei landslide in Three Gorges Reservoir area is used as case study. Its stability coefficients are simulated based on saturated-unsaturated seepage theory and finite element analysis. The operating conditions of stability coefficients calculation are reservoir water level variations between 175 m and 145 m, different rates of reservoir water level fluctuations, and a three-day continuous rainstorm. Results show that the stability coefficient of the hydrodynamic pressure landslide decreases with the drawdown of the reservoir water level, and a rapid drawdown rate leads to a small stability coefficient when the permeability coefficient ranges from 1.16 × 10 −6 m/s to 4.64 × 10 −5 m/s. Additionally, the landslide stability coefficient increases as the reservoir water level increases, and a rapid increase in the water level leads to a high stability coefficient when the permeability coefficient ranges from 1.16 × 10 −6 m/s to 4.64 × 10 −5 m/s. The landslide stability coefficient initially decreases and then increases as the reservoir water level declines when the permeability coefficient is greater than 4.64 × 10 −5 m/s. Moreover, for structures with the same landslide, the landslide stability coefficient is most sensitive to the change in the rate of reservoir water level drawdown when the permeability coefficient increases from 1.16 × 10 −6 m/s to 1.16 × 10 −4 m/s. Additionally, the rate of decrease in the stability coefficient increases as the permeability coefficient increases. Finally, the three-day rainstorm leads to a significant reduction in landslide stability, and the rate of decrease in the stability coefficient initially increases and then decreases as the permeability coefficient increases.

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Influence of filling–drawdown cycles of the Vajont reservoir on Mt. Toc slope stability

Cited by 189 publications

References 28 publications

Thermo-poro-mechanical analysis of landslides: from creeping behaviour to catastrophic failure

Thermo-poro-mechanical analysis of landslides: from creeping behaviour to catastrophic failure

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Stability Analysis of Hydrodynamic Pressure Landslides with Different Permeability Coefficients Affected by Reservoir Water Level Fluctuations and Rainstorms

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