Assessing the influence of the hydraulic boundary conditions on clay slope stability: The Fontana Monte case study

Lernia, A. di; Cotecchia, Federica; Elia, Gaetano; Tagarelli, Vito; Santaloia, F.; Palladino, Giuseppe

doi:10.1016/j.enggeo.2021.106509

Cited by 13 publications

(7 citation statements)

References 44 publications

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“…Wayllace et al (2019) showed how estimating rainfall and snowmelt infiltration over a large upstream catchment helped to explain the seasonally varying stability conditions of a landslide in an embankment of Interstate-70 (Colorado, USA), highlighted by piezometer and inclinometer measurements. di Lernia et al (2022) modeled the stability conditions of the Fontana Monte landslide (Italy). They found that the piezometric regime at large depths was influenced by the contact with an underground aquifer fed by a large upstream recharge area, a recurrent feature of several slopes in the South-Eastern Apennines.…”

Section: The Hydrology Perspective In Landslide Researchmentioning

confidence: 99%

Recent advancements of landslide hydrology

2023

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Occurrence of rainfall‐induced landslides is increasing worldwide, owing to land use and climate changes. Although the connection between hydrology and rainfall‐induced landslides might seem obvious, hydrological processes have been only marginally considered in landslide research for decades. In 2016, an advanced review paper published in WIREs Water [Bogaard and Greco (2016), WIREs Water, 3(3), 439–459] pointed out several challenging issues for landslide hydrology research: considering large‐scale hydrological processes in the assessment of slope water balance; including antecedent hydrological information in landslide hazard assessment; understanding and quantifying the feedbacks between deformation and infiltration/drainage processes; overcoming the conceptual mismatch of soil mechanics models and hydrological models. While little progress has been made on the latter two issues, a variety of studies have been published, focusing on the role of hydrological processes in landslide initiation and prediction. The importance of the identification of the origin of water to understand the processes leading to landslide activation is largely acknowledged. Techniques and methodologies for the definition of landslide catchments and for the assessment of landslide water balance are progressing fast, often considering the hydraulic effect of vegetation. The use of hydrological information in landslide prediction models has also progressed enormously. Empirical predictive tools, to be implemented in early warning systems for shallow landslides, benefit from the inclusion of antecedent soil moisture, extracted from different sources depending on the scale of the prediction, leading to significant improvement of their predictive skill. However, this kind of information is generally still missing in operational LEWS.This article is categorized under: Science of Water > Hydrological Processes

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Section: The Hydrology Perspective In Landslide Researchmentioning

confidence: 99%

Recent advancements of landslide hydrology

2023

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“…The choice of thickness should be governed by the geometrical extension and inclination of the slope, considering that in gentle natural slopes in soft soils (i.e., Case I), the band associated with a pre-existing roto-translation failure mechanism can be thicker, while in steep natural cuttings (i.e., Case II), the shear strains should be proportionally more localised in a thinner zone. Indeed, previous works have shown that the thickness of the weakened zone may range between centimetres and a few metres (e.g., [47][48][49][60][61][62][63]), and several contributions can be found in the literature where this feature has been specifically implemented in the numerical model of the slope [59,[64][65][66][67][68]. It is interesting to note that Griffiths and Lane [59] introduced a weaker layer with a thickness equal to 20% of the slope height in the stability analysis of a clay slope in undrained conditions.…”

Section: Site Conditionsmentioning

confidence: 99%

Investigating the Influence of a Pre-Existing Shear Band on the Seismic Response of Ideal Step-like Slopes Subjected to Weak Motions: Preliminary Results

2023

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The assessment of slope susceptibility to seismically-induced displacements receives wide attention in the geotechnical earthquake engineering field, but the alteration of the seismic wave inside the slope and at the ground surface due to the presence of a shear band confining a quiescent landslide body is rarely investigated. This paper describes the preliminary results of the numerical analysis of two step-like FE models, reproducing a gentle slope and steep cutting subjected to weak earthquakes, thus focusing on seismic wave amplification processes only. The results show that the higher the thickness of the weakened zone, the higher the maximum value of the amplification factors predicted at the ground surface. For gentle slopes affected by a landslide body confined by a thick shear band, the highest amplification factors are expected in the longer period range of 0.7–1.1 s, while the highest level of amplification is achieved in the intermediate period interval of 0.4–0.8 s in the case of steep slopes. In addition, the parasitic vertical component of acceleration can be considerably amplified beyond the crest and at the toe of the slope for increasing band thickness, especially in the case of steep topography, for which the effects of the shear band morphology enhance those related to the topographic profile. Finally, the fundamental frequency of the sloping deposit is not particularly affected by the presence of the shear band, while the amplitude of the amplification function at the fundamental frequency is clearly related to its thickness.

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“…In some circumstances, the existence of an underground aquifer supplied by an upstream hydraulic recharge area may be a risk issue for such activity, as it is responsible for deep piezometric heads that can fluctuate seasonally [17]. Many researches have examined the mechanism of the influence of temperature and saturation on unsaturated clay slope stability in light of clay slope instability induced by ambient temperature and rainfall infiltration in summer and autumn [18,19].…”

Section: Slope Stabilitymentioning

confidence: 99%

Slope Reinforcement Model Scale Test With X-Block

et al. 2022

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This study aims to determine the material composition and dimensions of X-block, develop a slope reinforcement model using X-block, evaluate the mechanical behavior of slopes that are reinforced with rock-bound by X-block, and analyze the performance of slope reinforcement using X-block. This research was conducted at Hasanuddin University's soil mechanics and civil engineering structure laboratory. The model scale test was employed in this study. The geometrical speciation of the test box is 150 cm in length, 60 cm in width, and 100 cm in height. The X-block model was produced using concrete with a FC of 25 MPa. The X-block was divided into two types: X-block type 1 and X-block type 2. Tensile strength testing is performed on the X-block. The slopes are made of clay soil and have a slope angle of 70 degrees. The loading test was conducted in three stages: without block, with X-block type 1, and with X-block type 2. The loading test uses a hydraulic pump equipped with a load cell and LVDT. The tensile strength of X-block type 1 is 2.56 MPa, whereas X-block type 2 has a tensile strength of 4.35 MPa. The development of the type X-block design, which is used as a retaining wall material, has shown that it can effectively withstand landslides on the slopes under consideration. The slope safety factor rose dramatically after being reinforced with type X-blocks, reaching 2.73 for both X-block type 1 and X-block type 2. Doi: 10.28991/CEJ-2022-08-03-014 Full Text: PDF

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Assessing the influence of the hydraulic boundary conditions on clay slope stability: The Fontana Monte case study

Cited by 13 publications

References 44 publications

Recent advancements of landslide hydrology

Recent advancements of landslide hydrology

Investigating the Influence of a Pre-Existing Shear Band on the Seismic Response of Ideal Step-like Slopes Subjected to Weak Motions: Preliminary Results

Slope Reinforcement Model Scale Test With X-Block

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