Analysis of the Effects of Seasonal Pore Pressure Variations on the Slope Stability Through Advanced Numerical Modelling

Elia, Gaetano; Falcone, Gaetano; Cotecchia, Federica; Rouainia, Mohamed

doi:10.1007/978-3-030-21359-6_20

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…However, the stability of a dam slope is determined by numerous factors, in addition to internal factors such as the physical parameters of the soil body. During normal operation of embankment dams, the reservoir level is often in a state of flux due to water storage or discharge, and the mutual replenishment of water inside and outside the waterfront of the dam slope causes the internal seepage field of the dam to constantly change which, in turn, affects the overall or local stability of the dam [10][11][12]. Hence, slope stability is often determined by a combination of internal and external factors.…”

Section: Introductionmentioning

confidence: 99%

Global Sensitivity Analysis Method for Embankment Dam Slope Stability Considering Seepage–Stress Coupling under Changing Reservoir Water Levels

Zhou

Shen

et al. 2023

Mathematics

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Ensuring the long-term, efficient, and safe operation of reservoir dams relies on the slope stability of embankment dams. Periodic fluctuations of the reservoir water level due to reservoir scheduling operations make the slope of the reservoir bank vulnerable to instability. To investigate the influence of various factors and their interactions with embankment dam slope stability under changing reservoir water levels, a global sensitivity analysis method is proposed that accounts for seepage–stress coupling. An embankment dam in Shaanxi Province, China, is studied as an example, with COMSOL Multiphysics software simulating the seepage and slope stability of the dam under fluctuating reservoir water level conditions and seepage–stress coupling. The global sensitivity analysis of factors affecting dam slope stability is accomplished by combining Plackett–Burman and Box–Behnken experimental designs, with ANOVA determining the sensitivity of each factor and interaction term. The results demonstrate that during the impoundment period of the reservoir, the saturation line is concave, and the overall stability safety of the dam slope increases first and then tends to be stable, according to the coefficient. The internal friction angle φ, cohesion c, and soil density ρs represent the three most sensitive factors affecting the stability and safety of the dam slope, while c × ρs is a second-order interaction term with significant sensitivity to the stability and safety coefficient of the dam slope. The reservoir drainage period infiltration line is convex, and dam slope stability first reduced and then increased. The magnitude of water level change H, internal friction angle φ, cohesion c, and soil density ρs are the four most sensitive factors for the coefficient of safety of dam slope stability, while c × ρs, H × ρs, and φ × ρs are the second-order interaction terms with significant sensitivity to the coefficient of safety of dam slope stability. These research findings and methods can offer valuable technical support and reference for the investigation and evaluation of the stability of embankment dam slopes.

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Section: Introductionmentioning

confidence: 99%

Global Sensitivity Analysis Method for Embankment Dam Slope Stability Considering Seepage–Stress Coupling under Changing Reservoir Water Levels

Zhou

Shen

et al. 2023

Mathematics

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“…Information on precipitation is typically accounted for because precipitation is a recognized trigger and predisposing factor of landslides. Climatic trends also are considered via changes in precipitation and evapotranspiration [12][13][14][15] , while temperature oscillations and trends are not accounted for explicitly (as model covariates) 16,17 . That is, current LSM approaches do not consider temperature as a possible direct driver of slope instability, even under climate change scenarios, except when discriminating between liquid and solid precipitation 18 or evaluating the depth of the active layer in cold climates.This picture contrasts with experimental results and field evidence of a direct role of temperature in the hydro-mechanical behavior of geomaterials, also in typical ranges for the ground surface and near subsurface.…”

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confidence: 99%

Surface temperature controls the pattern of post-earthquake landslide activity

Loche

Scaringi

Yunus

et al. 2022

Sci Rep

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The patterns and controls of the transient enhanced landsliding that follows strong earthquakes remain elusive. Geostatistical models can provide clues on the underlying processes by identifying relationships with a number of physical variables. These models do not typically consider thermal information, even though temperature is known to affect the hydro-mechanical behavior of geomaterials, which, in turn, controls slope stability. Here, we develop a slope unit-based multitemporal susceptibility model for the epicentral region of the 2008 Wenchuan earthquake to explore how land surface temperature (LST) relates to landslide patterns over time. We find that LST can explain post-earthquake landsliding while it has no visible effect on the coseismic scene, which is dominated by the strong shaking. Specifically, as the landscape progressively recovers and landslide rates decay to pre-earthquake levels, a positive relationship between LST and landslide persistence emerges. This seems consistent with the action of healing processes, capable of restoring the thermal sensitivity of the slope material after the seismic disturbance. Although analyses in other contexts (not necessarily seismic) are warranted, we advocate for the inclusion of thermal information in geostatistical modeling as it can help form a more physically consistent picture of slope stability controls.

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Numerical investigation on slope stability influenced by seismic load and discontinuity with a continuous-discontinuous method

Cai

Wang

et al. 2023

Bull Eng Geol Environ

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Analysis of the Effects of Seasonal Pore Pressure Variations on the Slope Stability Through Advanced Numerical Modelling

Cited by 8 publications

References 5 publications

Global Sensitivity Analysis Method for Embankment Dam Slope Stability Considering Seepage–Stress Coupling under Changing Reservoir Water Levels

Global Sensitivity Analysis Method for Embankment Dam Slope Stability Considering Seepage–Stress Coupling under Changing Reservoir Water Levels

Surface temperature controls the pattern of post-earthquake landslide activity

Numerical investigation on slope stability influenced by seismic load and discontinuity with a continuous-discontinuous method

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