Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Quantitative Evaluation of the Fracturing State of Crystalline Rocks Using Infrared Thermography
https://orcid.org/0000-0002-1555-4706
Abstract The fracturing state of rocks is a fundamental control on their hydro-mechanical properties. It can be quantified in the laboratory by non-destructive geophysical techniques that are hardly applicable in situ, where biased mapping and statistical sampling strategies are usually exploited. We explore the suitabilty of infrared thermography (IRT) to develop a quantitative, physics-based approach to predict rock fracturing starting from laboratory scales and conditions. To this aim, we performed an experimental study on the cooling behaviour of pre-fractured gneiss and mica schist samples, whose 3D fracture networks were reconstructed using Micro-CT and quantified by unbiased fracture abundance measures. We carried out cooling experiments in both controlled (laboratory) and natural (outdoor) environmental conditions and monitored temperature with a thermal camera. We extracted multi-temporal thermograms to reconstruct the spatial patterns and time histories of temperature during cooling. Their synthetic description show statistically significant correlations with fracture abundance measures. More intensely fractured rocks cool at faster rates and outdoor experiments show that differences in thermal response can be detected even in natural environmental conditions. 3D FEM models reproducing laboratory experiments outline the fundamental control of fracture pattern and convective boundary conditions on cooling dynamics. Based on a lumped capacitance approach, we provided a synthetic description of cooling curves in terms of a Curve Shape Parameter, independent on absolute thermal boundary conditions and lithology. This provides a starting point toward the development of a quantitative methodology for the contactless in situ assessment of rock mass fracturing.
Highlights We use Infrared Thermography (IRT) to quantify the cooling behaviour of rocks with different fracturing states in the laboratory.Rock samples characterized by higher fracture intensity / porosity cool faster than less fractured rocks.We model experimental cooling curves with a lumped capacitance equation and derive a Curve Shape Parameter independent on boundary conditions and lithology.The Curve Shape Parameters shows clear correlations with fracture abundance measures.Results lay the foundations to develop an upscaled methodology to predict the fracturing state of rock masses.
Quantitative Evaluation of the Fracturing State of Crystalline Rocks Using Infrared Thermography
https://orcid.org/0000-0002-1555-4706
Abstract The fracturing state of rocks is a fundamental control on their hydro-mechanical properties. It can be quantified in the laboratory by non-destructive geophysical techniques that are hardly applicable in situ, where biased mapping and statistical sampling strategies are usually exploited. We explore the suitabilty of infrared thermography (IRT) to develop a quantitative, physics-based approach to predict rock fracturing starting from laboratory scales and conditions. To this aim, we performed an experimental study on the cooling behaviour of pre-fractured gneiss and mica schist samples, whose 3D fracture networks were reconstructed using Micro-CT and quantified by unbiased fracture abundance measures. We carried out cooling experiments in both controlled (laboratory) and natural (outdoor) environmental conditions and monitored temperature with a thermal camera. We extracted multi-temporal thermograms to reconstruct the spatial patterns and time histories of temperature during cooling. Their synthetic description show statistically significant correlations with fracture abundance measures. More intensely fractured rocks cool at faster rates and outdoor experiments show that differences in thermal response can be detected even in natural environmental conditions. 3D FEM models reproducing laboratory experiments outline the fundamental control of fracture pattern and convective boundary conditions on cooling dynamics. Based on a lumped capacitance approach, we provided a synthetic description of cooling curves in terms of a Curve Shape Parameter, independent on absolute thermal boundary conditions and lithology. This provides a starting point toward the development of a quantitative methodology for the contactless in situ assessment of rock mass fracturing.
Highlights We use Infrared Thermography (IRT) to quantify the cooling behaviour of rocks with different fracturing states in the laboratory.Rock samples characterized by higher fracture intensity / porosity cool faster than less fractured rocks.We model experimental cooling curves with a lumped capacitance equation and derive a Curve Shape Parameter independent on boundary conditions and lithology.The Curve Shape Parameters shows clear correlations with fracture abundance measures.Results lay the foundations to develop an upscaled methodology to predict the fracturing state of rock masses.
Quantitative Evaluation of the Fracturing State of Crystalline Rocks Using Infrared Thermography
https://orcid.org/0000-0002-1555-4706
Abstract The fracturing state of rocks is a fundamental control on their hydro-mechanical properties. It can be quantified in the laboratory by non-destructive geophysical techniques that are hardly applicable in situ, where biased mapping and statistical sampling strategies are usually exploited. We explore the suitabilty of infrared thermography (IRT) to develop a quantitative, physics-based approach to predict rock fracturing starting from laboratory scales and conditions. To this aim, we performed an experimental study on the cooling behaviour of pre-fractured gneiss and mica schist samples, whose 3D fracture networks were reconstructed using Micro-CT and quantified by unbiased fracture abundance measures. We carried out cooling experiments in both controlled (laboratory) and natural (outdoor) environmental conditions and monitored temperature with a thermal camera. We extracted multi-temporal thermograms to reconstruct the spatial patterns and time histories of temperature during cooling. Their synthetic description show statistically significant correlations with fracture abundance measures. More intensely fractured rocks cool at faster rates and outdoor experiments show that differences in thermal response can be detected even in natural environmental conditions. 3D FEM models reproducing laboratory experiments outline the fundamental control of fracture pattern and convective boundary conditions on cooling dynamics. Based on a lumped capacitance approach, we provided a synthetic description of cooling curves in terms of a Curve Shape Parameter, independent on absolute thermal boundary conditions and lithology. This provides a starting point toward the development of a quantitative methodology for the contactless in situ assessment of rock mass fracturing.
Highlights We use Infrared Thermography (IRT) to quantify the cooling behaviour of rocks with different fracturing states in the laboratory.Rock samples characterized by higher fracture intensity / porosity cool faster than less fractured rocks.We model experimental cooling curves with a lumped capacitance equation and derive a Curve Shape Parameter independent on boundary conditions and lithology.The Curve Shape Parameters shows clear correlations with fracture abundance measures.Results lay the foundations to develop an upscaled methodology to predict the fracturing state of rock masses.
Quantitative Evaluation of the Fracturing State of Crystalline Rocks Using Infrared Thermography
Franzosi, Federico (Autor:in) / Casiraghi, Stefano (Autor:in) / Colombo, Roberto (Autor:in) / Crippa, Chiara (Autor:in) / Agliardi, Federico (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Quantitative infrared thermography in buildings
| Online Contents | 1999
Using quantitative infrared thermography to determine indoor air temperature
| Online Contents | 2013
Evaluation of building materials using infrared thermography
| Online Contents | 2007
Evaluation of building materials using infrared thermography
| British Library Online Contents | 2007
Hydroimpulse fracturing of rocks
| Online Contents | 1974