Thermomechanical behavior of Pravcicka Brana Rock Arch (Czech Republic)

Greif, Vladimír; Brcek, Martin; Vlčko, Ján; Vařilová, Zuzana; Zvelebil, Jiří

doi:10.1007/s10346-016-0784-5

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…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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“…The increasing interest in thermally-induced effects on jointed rock masses [17,[35][36][37][38][39][40][41] requires an improvement in the techniques for temperature field analysis to integrate traditional direct contact methods [14,42]. In this sense, IRT surveys support the quantitative study of surface temperature fields over rock slopes, deriving distributed maps at their external interface.…”

Section: Discussionmentioning

confidence: 99%

3D Thermal Monitoring of Jointed Rock Masses through Infrared Thermography and Photogrammetry

et al. 2021

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The study of strain effects in thermally-forced rock masses has gathered growing interest from engineering geology researchers in the last decade. In this framework, digital photogrammetry and infrared thermography have become two of the most exploited remote surveying techniques in engineering geology applications because they can provide useful information concerning geomechanical and thermal conditions of these complex natural systems where the mechanical role of joints cannot be neglected. In this paper, a methodology is proposed for generating point clouds of rock masses prone to failure, combining the high geometric accuracy of RGB optical images and the thermal information derived by infrared thermography surveys. Multiple 3D thermal point clouds and a high-resolution RGB point cloud were separately generated and co-registered by acquiring thermograms at different times of the day and in different seasons using commercial software for Structure from Motion and point cloud analysis. Temperature attributes of thermal point clouds were merged with the reference high-resolution optical point cloud to obtain a composite 3D model storing accurate geometric information and multitemporal surface temperature distributions. The quality of merged point clouds was evaluated by comparing temperature distributions derived by 2D thermograms and 3D thermal models, with a view to estimating their accuracy in describing surface thermal fields. Moreover, a preliminary attempt was made to test the feasibility of this approach in investigating the thermal behavior of complex natural systems such as jointed rock masses by analyzing the spatial distribution and temporal evolution of surface temperature ranges under different climatic conditions. The obtained results show that despite the low resolution of the IR sensor, the geometric accuracy and the correspondence between 2D and 3D temperature measurements are high enough to consider 3D thermal point clouds suitable to describe surface temperature distributions and adequate for monitoring purposes of jointed rock mass.

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“…The loss of stability, caused by repeated changes in the stress field inside the rock, eventually leads to a rockfall, one of the fastest and most dangerous forms of slope processes (Weber et al, 2017(Weber et al, , 2018Gunzburger et al, 2005). In the alpine environment, rockfalls are increasingly caused by permafrost degradation and frost cracking (Gruber et al, 2004;Ravanel et al, 2017), or temperature-related glacial retreat (Hoelzle et al, 2017). To address the influence of permafrost melting on the rock slope stability, several monitoring systems/campaigns were proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Rock slope monitoring is a common task in engineering geology and is often used at construction sites (Ma et al, 2020;Li et al, 2018;Scaoni et al, 2018), along roads or railways, or to protect settlements. Various approaches are used, with a background in geodesy (Gunzburger et al, 2005;Reiterer et al, 2010;Yavasoglu et al, 2020), geotechnics (Greif et al, 2017;Lazar et al, 2018), geophysics (Burjanek et al, 2010;Weber et al, 2017Weber et al, , 2018Coccia et al, 2016;Yan et al, 2019;Weigand et al, 2020;Warren et al, 2013), or remote sensing methods (Sarro et al, 2018;Matano et al, 2015). Most commonly, sensors such as thermometers, accelerometers, inclinometers, visible light or IR cameras, total stations, TLS (terrestrial laser scanner), GbSAR (ground-based synthetic-aperture radar), and seismographs are used to detect potential rockfall events (Burjanek et al, 2010(Burjanek et al, , 2018Tripolitsiotis et al, 2015;Matsuoka, 2019).…”

Section: Introductionmentioning

confidence: 99%

Observation of the rock slope thermal regime, coupled with crackmeter stability monitoring: initial results from three different sites in Czechia (central Europe)

Racek

Blahůt

Hartvich

2021

Geosci. Instrum. Method. Data Syst.

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Abstract. This paper describes a newly designed, experimental, and affordable rock slope monitoring system. This system is being used to monitor three rock slopes in Czechia for a period of up to 2 years. The instrumented rock slopes have different lithology (sandstone, limestone, and granite), aspect, and structural and mechanical properties. Induction crackmeters monitor the dynamic of joints, which separate unstable rock blocks from the rock face. This setup works with a repeatability of measurements of 0.05 mm. External destabilising factors (air temperature, precipitation, incoming and outgoing radiation, etc.) are measured by a weather station placed directly within the rock slope. Thermal behaviour in the rock slope surface zone is monitored using a compound temperature probe, placed inside a 3 m deep subhorizontal borehole, which is insulated from external air temperature. Additionally, one thermocouple is placed directly on the rock slope surface. From the time series measured to date (the longest since autumn 2018), we are able to distinguish differences between the annual and diurnal temperature cycles of the monitored sites. From the first data, a greater annual joint dynamic is measured in the case of larger blocks; however, smaller blocks are more responsive to short-term diurnal temperature cycles. Differences in the thermal regime between the sites are also recognisable and are caused mainly by different slope aspect, rock mass thermal conductivity, and colour. These differences will be explained by the statistical analysis of longer time series in the future.

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Thermomechanical behavior of Pravcicka Brana Rock Arch (Czech Republic)

Cited by 11 publications

References 34 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)

3D Thermal Monitoring of Jointed Rock Masses through Infrared Thermography and Photogrammetry

Observation of the rock slope thermal regime, coupled with crackmeter stability monitoring: initial results from three different sites in Czechia (central Europe)

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