An integrated geological, geotechnical and geophysical approach to identify predisposing factors for flowslide occurrence

Maio, Rosa Di; Paola, C. De; Forte, Giovanni; Piegari, E.; Pirone, Marianna; Santo, Antonio; Urciuoli, Gianfranco

doi:10.1016/j.enggeo.2019.105473

Cited by 32 publications

(24 citation statements)

References 37 publications

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“…Over the last two decades, many experimental studies have focused on the triggering mechanisms of flowslides and debris flows in the pyroclastic soils in Campania, southern Italy [7,59]. In particular, representative testing sites of different regional geological contexts were instrumented to monitor the weather conditions, soil matric suction, and soil water content to investigate the field hydraulic properties of pyroclastic soils [12,13,15,21,33,45,[48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic hysteresis of natural pyroclastic soils in partially saturated conditions: experimental investigation and modelling

et al. 2021

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In many geotechnical applications, especially in the study of weather-induced landslides, a reliable soil hydraulic characterization in unsaturated conditions is required. Currently, the experimental techniques that neglect the hydraulic hysteresis represent the greatest limitation to landslide forecasting. In this paper, a procedure to obtain an unsaturated soil hydraulic characterization on natural pyroclastic samples is proposed and verified. The approach enables the evaluation of the soil hydraulic properties along the main drying path and wetting/drying cycles to fully quantify the effects of the hydraulic hysteresis. Pyroclastic soil samples collected at a test site at Mount Faito in the Campania region (southern Italy) were tested. The experimental investigation consisted of a sequence of testing phases: a constant-head hydraulic conductivity test, a forced evaporation test followed by several wetting–drying cycles, and a drying test in a pressure plate apparatus. The hysteretic model proposed by Parker and Lenhard (1987) was adopted to fit the data, while inverse modelling of the forced evaporation tests allowed to derive the model parameters. Therefore, the main drying and wetting branches and the soil response to drying and wetting cycles from any reversal point were reproduced with the model, which suitably described the hysteretic behaviour of the pyroclastic soil under all conditions and along all paths.

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Section: Introductionmentioning

confidence: 99%

Hydraulic hysteresis of natural pyroclastic soils in partially saturated conditions: experimental investigation and modelling

et al. 2021

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“…Similarly, other authors focus on perched aquifer water level fluctuations (Greco et al 2018) that may play an important role in landslide triggering (Hong and Wan 2011;Yin et al 2016). Indeed, geophysical survey techniques have shown considerable amount of water stored in the upper part of the limestone bedrock underlying a pyroclastic-covered slope in Campania (Di Maio et al 2020). In addition to rainfall, other factors may influence triggering conditions, such as stratigraphic (Crosta and Dal Negro 2003) or geometrical discontinuities (Guadagno et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Prediction of shallow landslides in pyroclastic-covered slopes by coupled modeling of unsaturated and saturated groundwater flow

et al. 2020

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Slopes covered with unsaturated shallow pyroclastic deposits, lying upon fractured limestone bedrock, are widespread in the mountains around Naples (southern Italy). Rainfall infiltration, reducing soil suction, eventually triggers shallow landslides. While drastic reduction of suction is unanimously recognized as the triggering mechanism, there is still debate about the hydrological processes controlling slope drainage and causing the establishment of landslide predisposing conditions. Field observations at the slope of Cervinara suggested that temporary storage of water in a perched aquifer, in the upper part of the fractured bedrock, may affect the leakage through the soil-bedrock interface. Hence, a physically based model, coupling flows in the unsaturated soil cover and in the perched aquifer, has been applied to three large rainfall events which occurred in December 1999 (when a landslide was triggered), January 2009, and November 2012. The results highlight that the different responses of soil and aquifer to precipitations, related not only to rainfall event characteristics (i.e., duration and mean intensity) but also to the initial conditions of the slope, determined by antecedent precipitations, can play a prominent role in the triggering of landslides. In fact, further simulations with synthetic rainfall events and different initial conditions provide a possible interpretation of the triggering of the landslide of December 1999, indicating that a soil profile with dry conditions at the base and a low level in the perched aquifer, typical of late autumn, can impede the drainage of infiltrating water through the soil-bedrock interface, thus favoring the buildup of pore pressure within the soil cover.

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“…These joints were also identified in ERT profiles 1, 2, and 3 (Figures 4-6) by low resistivity values of <60 Ω•m towards the upstream, the right abutment, and downstream [53]. This low resistivity zone is (embedded between the lithologies with high resistivity values) often indicated by the geological and geotechnical parameters that is attributed to the leakage from highly fractured and loose lithology [54].…”

Section: Integration Of Electrical Resistivity Tomographymentioning

confidence: 76%

Integrated Geophysical and Geotechnical Approaches for Evaluating Dam Seepage in Lesser Himalayan Region of Pakistan

et al. 2023

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Dam leakage is a major problem in earth-filled reservoir dams. The present research is aimed at detecting the seepage zones in an earth-filled reservoir dam in the vicinity of Sarobi village, North Waziristan, Pakistan. The objective was achieved by integrating geological, geotechnical, and geophysical datasets. Geological survey was carried out in the area to identify the surface exposures. Geotechnical data involved was used to estimation of permeability and Lugeon values to identify network of joints/fractures whereas electrical resistivity tomography (ERT) technique (utilizing Wenner-Schlumberger configuration) was applied for the identification of the leakage zones. Geological data revealed highly deformed alluvium towards the right abutment underlain by compressed shale and highly fractured limestone beds. Geotechnical data indicated high permeability, Lugeon values, and concentration of sand and gravel towards the right abutment whereas low permeability, Lugeon values, and higher concentration of silt and clay were observed towards the left abutment. ERT data identified a conductive zone embedded between impermeable lithologies having resistivity between 10 and 60 Ω·m. This conductive zone was observed in parallel profiles acquired in upstream, dam crest, and downstream parts of the dam. The integration of all the datasets revealed a network of joints that are interconnected and provide a path for water at the upstream side to pass through right abutment of dam and leak towards the downstream.

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An integrated geological, geotechnical and geophysical approach to identify predisposing factors for flowslide occurrence

Cited by 32 publications

References 37 publications

Hydraulic hysteresis of natural pyroclastic soils in partially saturated conditions: experimental investigation and modelling

Hydraulic hysteresis of natural pyroclastic soils in partially saturated conditions: experimental investigation and modelling

Prediction of shallow landslides in pyroclastic-covered slopes by coupled modeling of unsaturated and saturated groundwater flow

Integrated Geophysical and Geotechnical Approaches for Evaluating Dam Seepage in Lesser Himalayan Region of Pakistan

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