Deformations Dynamics in Response to Seasonal Temperature Oscillations: An Example from Pravcicka Brana Rock Arch (Czech Republic)

Vlčko, Ján; Brcek, Martin; Greif, Vladimír

doi:10.1007/978-3-319-04996-0_55

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…It was demonstrated that across discontinuous jointed media, primary porosity and crack density can influence the heat propagation within a rock mass and particularly affecting the surficial cooling rate at its interface [ 34 , 50 ]. Natural diurnal or annual temperature oscillations can induce long-term thermo-mechanical effects on rock masses able to influence the integrity of natural [ 51 ] or cultural heritage [ 52 , 53 ]. Moreover, numerical models of temperature distribution are useful for detecting the existence of thermally driven deformation comprising both quasi-cyclical (reversible) and irreversible (plastic) strains [ 54 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Fiorucci

Marmoni

Martino

2018

Sensors

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The Mediterranean region is affected by considerable daily and seasonal temperature variations due to intense solar radiation. In mid-seasons, thermal excursions can exceed tens of degrees thus influencing the long-term behaviour of jointed rock masses acting as a preparatory factor for rock slope instabilities. In order to evaluate the thermal response of a densely jointed rock-block, monitoring has been in operation since 2016 by direct and remote sensing techniques in an abandoned quarry in Acuto (central Italy). Monthly InfraRed Thermographic (IRT) surveys were carried out on its exposed faces and along sections of interest across monitored main joints. The results highlight the daily and seasonal cyclical behaviour, constraining amplitudes and rates of heating and cooling phases. The temperature time-series revealed the effect of sun radiation and exposure on thermal response of the rock-block, which mainly depends on the seasonal conditions. The influence of opened joints in the heat propagation is revealed by the differential heating experienced across it, which was verified under 1D and 2D analysis. IRT has proved to be a valid monitoring technique in supporting traditional approaches, for the definition of the surficial temperature distribution on rock masses or stone building materials.

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Section: Introductionmentioning

confidence: 99%

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Fiorucci

Marmoni

Martino

2018

Sensors

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“…Par leurs effets thermomécaniques, les variations de température momentanées, diurnes et saisonnières sont de nature à dégrader les sites remarquables naturels et historiques constitués ou portés par des massifs rocheux. Quelques cas d'études ont été publiés dans la littérature, concernant des sites naturels (Vlcko et al, 2014 ;Greif et al, 2017) ou des sites historiques (Greif et al, 2006 ;Vlcko et al, 2009 ;Bakun-Mazor et al, 2013 ;Delmonaco et al, 2017). En France, le site de La Roque-Gageac donne un exemple de l'auscultation d'une falaise et du toit d'une grotte située en hauteur, où les instabilités rocheuses constituent une menace forte sur les constructions établies en aval.…”

Section: Sites Remarquablesunclassified

Suivi des déformations du massif rocheux sous la fondation de la pile VII du Pont du Gard

Serratrice

2020

Rev. Fr. Geotech.

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Le Pont du Gard est un pont-aqueduc romain construit vers 50 après JC pour assurer le franchissement des gorges du Gardon par un aqueduc d’alimentation de la ville de Nîmes (France). Le pont-aqueduc et le pont routier attenant sont édifiés sur un entablement calcaire urgonien, karstifié et fracturé. Les ouvrages enjambent le lit mineur du Gardon par une voûte qui relie les piles VII et VIII. D’un point de vue géologique, ce chenal profond constitue une incision fracturée majeure dans ce paysage rocheux. Depuis près d’un siècle, les craintes d’une déstabilisation des flancs subverticaux de ce chenal ont motivé la mise en place de protections et de dispositifs de renforcement du massif rocheux. Un appareillage constitué par deux boulons instrumentés au moyen de capteurs extensométriques et une sonde de température a été mis en place dans l’appui rocheux de la pile VII et a fait l’objet d’un suivi pendant plusieurs années. Cette auscultation révèle des déformations de la roche qui évoluent avec le régime saisonnier des températures atmosphériques. Parmi les fluctuations journalières, des petits évènements semblent pouvoir être attribués à la variation de la température de l’eau pendant certaines crues du Gardon. Un calcul approximatif de ces variations saisonnières et momentanées a été effectué au moyen d’une formulation analytique. Un premier paragraphe présente une revue bibliographique des effets thermiques dans les massifs rocheux sous l’influence des conditions climatiques. Le paragraphe suivant est consacré à la présentation du site, de ses conditions environnementales et des travaux de renforcement. Les principales caractéristiques du dispositif d’auscultation sont présentées ensuite, puis les données recueillies. Une simulation des effets de la température est proposée enfin. Les résultats permettent d’expliquer effectivement l’ordre de grandeur des déformations observées dans la roche.

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“…Among the physical phenomena to consider, thermo‐acousto‐elasticity (TAE) is of primary interest as it relates changes to the rock's surface temperature to its internal state of stress (Guillemot et al., 2022). Indeed, thermal cycles (solar radiation and atmospheric convection at annual and daily time scales) induce additional stress within the external, exposed part of the rock body, through differential thermal dilation (Gasc‐Barbier et al., 2021; Gischig et al., 2011; Grechi et al., 2021; Richter et al., 2014; Vlcko et al., 2014). Furthermore, laboratory experiments on rocks reveal stress‐dependent acoustic wave velocities related to non‐linear elasticity (Guyer & Johnson, 2009).…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Seismic Monitoring of the Pillar Threatening the World Cultural Heritage Site Chauvet‐Pont d'Arc Cave, Toward Rock Damage Assessment

Guillemot,

Audin,

Larose

et al. 2024

Earth and Space Science

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Fragile geological features must undergo frequent structural health assessments to prevent catastrophic failure events. The mechanical behavior of natural sites is largely guided by vibrations of the earth and environmental exposure, but damage is rarely assessed, except empirically. The Chauvet‐Pont d’Arc cave, a UNESCO World Heritage Site, represents a shining example of fragility that would benefit from monitoring. It is overhung by a rock column known as Abraham's pillar that extends out from the cliff like a natural tuning fork. For this study, we monitored dancing movements of this pillar for over 2 years to analyze its elastic response to weather conditions. Using ambient‐seismic‐noise‐based methods, we identified the pillar's first two natural resonance modes. Through extensive monitoring of the site, we observed the striking temporal evolution of these two resonance frequencies on hourly, daily, seasonal, and pluriannual scales in response to changes in air temperature and insolation. Based on thermo‐acousto‐elastic modeling with a simplified 3D geometric structure, we determined how thermally‐induced stress stiffening affects the rock material, by applying convective and radiative heat fluxes to the model. From the results obtained, we suggest a novel quantitative method based on daily observations that can estimate the level of damage within the rock material. Our work provides a foundation for distinguishing between reversible processes and damage for hazard studies in the frame of climate change. Such knowledge is crucial not only for the preservation of heritage sites but also for enhancing risk assessment protocols and informing conservation efforts worldwide.

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Deformations Dynamics in Response to Seasonal Temperature Oscillations: An Example from Pravcicka Brana Rock Arch (Czech Republic)

Cited by 5 publications

References 16 publications

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Thermal Response of Jointed Rock Masses Inferred from Infrared Thermographic Surveying (Acuto Test-Site, Italy)

Suivi des déformations du massif rocheux sous la fondation de la pile VII du Pont du Gard

A Comprehensive Seismic Monitoring of the Pillar Threatening the World Cultural Heritage Site Chauvet‐Pont d'Arc Cave, Toward Rock Damage Assessment

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