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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
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Remote thermal detection of exfoliation sheet deformation
Antoine Guerin1, Michel Jaboyedoff1, Brian D Collins2
1Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland.
Landslides
|March 22, 2021
Summary
Daily temperature cycles cause rock deformations, leading to rock slope failures. New research uses terrestrial laser scanning (TLS) and infrared thermography (IRT) to monitor these rock deformations and identify potential rockfall sources.
Area of Science:
- Geosciences
- Rock Mechanics
- Remote Sensing
Background:
- Rock slope failures are linked to daily temperature-induced rock deformations.
- Previous studies lacked comprehensive 3D monitoring of these deformations and temperature changes.
Purpose of the Study:
- To investigate daily rock deformations in granitic exfoliating cliffs using integrated TLS and IRT.
- To confirm previously documented thermal behavior and identify new exfoliation sheets prone to deformation.
Main Methods:
- Integrated terrestrial laser scanning (TLS) and infrared thermography (IRT) for high-frequency monitoring.
- In situ instrumentation to validate remote sensing data.
- Remote detection and confirmation of exfoliation sheet deformations.
Main Results:
- Confirmed daily closing/opening of exfoliation fractures due to temperature fluctuations.
- Identified a correlation between fracture aperture, temperature variation, and deformation magnitude.
- Remotely detected 11 exfoliation sheets using IRT, with TLS confirming their deformation patterns.
Conclusions:
- Coupled TLS and IRT enable remote detection of thermally induced rock deformations.
- IRT alone can identify partially detached exfoliation sheets capable of significant deformation.
- This approach offers an efficient method for assessing rockfall hazards on exfoliating cliffs.
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