InfraRed Thermography proposed for the estimation of the Cooling Rate Index in the remote survey of rock masses

Pappalardo, G.; Mineo, Simone; Zampelli, Sebastiano Perriello; Cubito, A.; Calcaterra, Domenico

doi:10.1016/j.ijrmms.2016.01.010

Cited by 87 publications

(81 citation statements)

References 27 publications

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“…In recent years IRT has undergone a significant increase of applications in the field of geosciences (Spampinato et al 2011), nevertheless in the study of slope instability processes it is still experimentally used, except for a few interesting experimental studies (Wu et al, 2005;Baroň et al 2012;Frodella et al, 2014b). In particular, IRT (often coupled with laser scanning) is applied with the following purposes: i) obtain information about the rock mass fracturing (Squarzoni et al 2008); ii) detect shallow surface weakness in rock walls (Teza et al 2012); iii) perform rockfall/slide susceptibility assessment (Gigli et al 2014a, c;Teza et al 2015); iv) map ephemeral drainage patterns ; v) integrate traditional geo-structural and geomechanical surveys (Mineo et al, 2015;Mineo and Pappalardo 2016;Pappalardo et al, 2016).…”

Section: Irtmentioning

confidence: 99%

Spaceborne, UAV and ground-based remote sensing techniques for landslide mapping, monitoring and early warning

Casagli

Frodella

Morelli

et al. 2017

Geoenviron Disasters

267

146

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Background: The current availability of advanced remote sensing technologies in the field of landslide analysis allows for rapid and easily updatable data acquisitions, improving the traditional capabilities of detection, mapping and monitoring, as well as optimizing fieldwork and investigating hazardous or inaccessible areas, while granting at the same time the safety of the operators. Among Earth Observation (EO) techniques in the last decades optical Very High Resolution (VHR) and Synthetic Aperture Radar (SAR) imagery represent very effective tools for these implementations, since very high spatial resolution can be obtained by means of optical systems, and by the new generations of sensors designed for interferometric applications. Although these spaceborne platforms have revisiting times of few days they still cannot match the spatial detail or time resolution achievable by means of Unmanned Aerial Vehicles (UAV) Digital Photogrammetry (DP), and ground-based devices, such as Ground-Based Interferometric SAR (GB-InSAR), Terrestrial Laser Scanning (TLS) and InfraRed Thermography (IRT), which in the recent years have undergone a significant increase of usage, thanks to their technological development and data quality improvement, fast measurement and processing times, portability and cost-effectiveness. In this paper the potential of the abovementioned techniques and the effectiveness of their synergic use is explored in the field of landslide analysis by analyzing various case studies, characterized by different slope instability processes, spatial scales and risk management phases. Results: Spaceborne optical Very High Resolution (VHR) and SAR data were applied at a basin scale for analysing shallow rapid-moving and slow-moving landslides in the emergency management and post-disaster phases, demonstrating their effectiveness for post-disaster damage assessment, landslide detection and rapid mapping, the definition of states of activity and updating of landslide inventory maps. The potential of UAV-DP for very high resolution periodical checks of instability phenomena was explored at a slope-scale in a selected test site; two shallow landslides were detected and characterized, in terms of areal extension, volume and temporal evolution. The combined use of GB-InSAR, TLS and IRT ground based methods, was applied for the surveying, monitoring and characterization of rock slides, unstable cliffs and translational slides. These applications were evaluated in the framework of successful rapid risk scenario evaluation, long term monitoring and emergency management activities. All of the results were validated by means of field surveying activities.

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Section: Irtmentioning

confidence: 99%

Spaceborne, UAV and ground-based remote sensing techniques for landslide mapping, monitoring and early warning

Casagli

Frodella

Morelli

et al. 2017

Geoenviron Disasters

267

146

View full text Add to dashboard Cite

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“…Mineo et al (2015a) carried out IRT surveys for the detection of potentially unstable areas along a rock slope in Sicily, proving the suitability of this technique for such purposes. Preliminary information on the applicability of IRT to rock mechanics were inferred also by Mineo et al (2015b), who studied and compared thermograms of two rock masses at different times, and Pappalardo et al (2016b), who found a relationship between the thermal behavior of rock masses and their fracturing, demonstrating that the higher the degree of fracturing the faster the rock mass cooling. Starting from a similar assumption, with reference to hand scale rock samples, we believe that the thermal behavior of a rock is likely to be related to its porosity.…”

Section: Application Of Infrared Thermography In Rock Mechanicsmentioning

confidence: 97%

The Use of Infrared Thermography for Porosity Assessment of Intact Rock

Mineo

Pappalardo

2016

Rock Mech Rock Eng

Self Cite

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Preliminary results on a new test for the indirect assessment of porosity through infrared thermography are presented. The study of the cooling behavior of rock samples in laboratory, through the analysis of thermograms, proved an innovative tool for the estimation of such an important property, which is one of the main features affecting the mechanical behavior of rocks. A detailed experimentation was performed on artificially heated volcanic rock samples characterized by different porosity values. The cooling trend was described both graphically and numerically, with the help of cooling curves and Cooling Rate Index. The latter, which proved strictly linked to porosity, was employed to find reliable equations for its indirect estimation. Simple and multiple regression analyses returned satisfactory outcomes, highlighting the great match between predicted and measured porosity values, thus confirming the goodness of the proposed model. This study brings a novelty in rock mechanics, laying the foundation for future researches aimed at refining achieved results for the validation of the model in a larger scale.

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“…The most open discontinuities are sometimes filled with hard or soft material, indicating a certain rate of water circulation within the rock mass. This is a key element supporting instability features, since water circulation favors weathering and worsening of the mechanical attitude of rocks (e.g., [5,12,43,44]). Persistence of discontinuities is a hard parameter to evaluate, and it affects the slope modeling.…”

Section: Geomechanical and Kinematic Analysis Of Rock Massesmentioning

confidence: 99%

“…This set is cut by orthogonal systems with unfavorable geometries from the stability point of view. Such setting is in accordance with the geomechanical condition of neighboring outcrops, recently studied for stability purposes also through innovative remote survey methodologies [44][45][46][47]. All of the geomechanical parameters surveyed in the field were employed to classify rock masses according to the Rock Mass Rating classification system [48].…”

Section: Geomechanical and Kinematic Analysis Of Rock Massesmentioning

confidence: 99%

Rockfall Analysis for Preliminary Hazard Assessment of the Cliff of Taormina Saracen Castle (Sicily)

et al. 2018

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Abstract:A rockfall analysis at one of the most relevant cultural heritage sites of northeastern Sicily (Italy) is presented herein with the aim of assessing the hazard arising from the unstable conditions of the rock cliff of Taormina city, upon which the Saracen Castle is perched on its top. Several rockfalls affected this area in the latest years, representing a serious threat for the safety of inhabitants and tourists. Therefore, the qualitative Evolving Rockfall Hazard Assessment (ERHA) was applied for the hazard zonation, supported by rock mass surveys and Terrestrial Laser Scanner prospecting. Kinematic analysis revealed that the unstable rock failure patterns are represented by planar/wedge sliding and toppling, while simulation of potential rockfalls allowed studying the impact of future events in terms of trajectory and energy. This is higher at the foot of scarps and in steeper sectors, where the application of ERHA identified a critical zone close to the inhabited center, which is one of the main elements at risk, along with a pedestrian tourist path. Achieved results represent a starting point for the definition of risk management strategies and provide a scientific contribution to the study of hazard and risk arising from rockfall occurrence.

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InfraRed Thermography proposed for the estimation of the Cooling Rate Index in the remote survey of rock masses

Cited by 87 publications

References 27 publications

Spaceborne, UAV and ground-based remote sensing techniques for landslide mapping, monitoring and early warning

Spaceborne, UAV and ground-based remote sensing techniques for landslide mapping, monitoring and early warning

The Use of Infrared Thermography for Porosity Assessment of Intact Rock

Rockfall Analysis for Preliminary Hazard Assessment of the Cliff of Taormina Saracen Castle (Sicily)

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