Crack Detection in Frozen Soils Using Infrared Thermographic Camera

Zhao, Yatong; Han, Yufan; Chen, Cheng; Seo, Hyungjoon

doi:10.3390/s22030885

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…The method of freeze sinking has been widely used in China to improve the soil strength and shaft wall stability during excavation (e.g. Wang et al [ 25 ]; Liu and Wang [ 26 ]; Zhao et al [ 27 ]). Systematic studies on the mechanical properties of frozen soils have been reported, which investigate the influences of temperature, stress condition, and the moisture content [ 28 – 32 ].…”

Section: Resultsmentioning

confidence: 99%

An elastic-plastic solution for the optimal thickness of a frozen soil wall considering an interaction with the surrounding rock

Kuang

Wang

et al. 2022

PLoS ONE

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The technology of artificial ground freezing has been widely applied in geotechnical engineering to support underground spaces, whereas the effects of excavation-induced large deformation and frictional and dilatant behavior of geomaterials are neglected in the current design. In this paper, a rigorous elastic-plastic solution of cavity contraction is proposed using a non-associated Mohr-Coulomb failure criterion to provide the optimal thickness of the frozen soil wall for excavation using artificial ground freezing technology, considering an interaction between the frozen soil wall and the surrounding soil/rock. After validation of a case study on a deep mine shaft against a numerical simulation, a thorough parametric study investigates the variation in the optimal thickness with the soil properties and initial stress conditions, as well as the effects of interaction and the critical condition. Compared to the existing solution, the proposed optimal thickness of the frozen soil wall is shown to contribute to both the design and cost-effectiveness in practical engineering, including tunneling and mine shaft construction.

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Section: Resultsmentioning

confidence: 99%

An elastic-plastic solution for the optimal thickness of a frozen soil wall considering an interaction with the surrounding rock

Kuang

Wang

et al. 2022

PLoS ONE

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“…The strength of frozen ground depends on temperature, porosity, water content, loading rate, and other factors, as shown in [11,[25][26][27][28]. All these factors inevitably affected the values of F peak and u peak in our model (14), so this model can be applied or adapted to other mechanical systems.…”

Section: Discussionmentioning

confidence: 99%

Analytical Model for the Load-Bearing Capacity Analysis of Winter Forest Roads: Experiment and Estimation

Katarov

Syunev

Kolesnikov

2022

Forests

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In northern forests, winter is the preferred time for logging operations, since, when wet soils freeze, their strength increases, which ensures a high load-bearing capacity of winter forest roads and reduces the cost of forestry work by increasing the load on forestry equipment, including when driving through frozen lowlands. The present article analyzes frozen loamy–sandy soil, which, at subzero temperatures, behaves like a brittle material with a sufficiently high, but limited, strength. Well-known models commonly use empirical parameters, correlations, and numerical methods to estimate the strength of such materials. An analytical model of the full load–displacement curve would reduce the number of necessary calculations and increase the ability to predict the bearing capacity of winter forest roads. However, there are few of these models. Such models were developed, as a rule, to study stress–strain in concrete and rocks, meaning that researchers have to recalculate the load into stress and displacement into deformation, which is not always simple. This work aimed at theoretically justifying a new analytical model for quantifying the bearing capacity of winter forest roads and assessing the adequacy of the model by comparing it with experimental data. To achieve this purpose, the concepts of fracture mechanics and methods of mathematical modeling were used. The model was verified using experimental data, and model examples for determining the peak load were provided. Prospects for development of the research topic were also considered, taking into account new developments in forest road monitoring for logging management.

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“…Digital cameras may not be able to capture micro-cracks in red brick due to pixel resolution. However, infrared thermal images can detect cracks through micro-cracks and the temperature difference between cracks and red bricks [38,39]. Therefore, in this paper, a thermal infrared camera was used to detect not only cracks, but also various objects present in the heritage building.…”

Section: Infrared Thermal Imagingmentioning

confidence: 99%

Multi-Label Classification and Automatic Damage Detection of Masonry Heritage Building through CNN Analysis of Infrared Thermal Imaging

et al. 2023

Self Cite

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In the era of the first Industrial Revolution, many buildings were built with red bricks, and the heritage buildings built at that time are more than 100 years old. In these old heritage buildings, damage is bound to occur due to chemical and physical effects. Technologies such as automatic damage detection can effectively manage damage, but they can be affected by other categories present in heritage buildings. Therefore, this paper proposes a CNN algorithm that can automatically detect cracks and damage that occur in heritage buildings, as well as multi-label classification, such as doors, windows, arches, artwork, brick walls, stonewalls, and vents. A total of 2400 thermal infrared images are collected for 8 categories and automatic classification was performed using the CNN algorithm. The average precision and average sensitivity for the eight categories of heritage buildings are 97.72% and 97.43%, respectively. This paper defines the causes of misclassification as the following two causes: misclassification by multiple objects and misclassification by the perception of the CNN algorithm.

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Crack Detection in Frozen Soils Using Infrared Thermographic Camera

Cited by 8 publications

References 20 publications

An elastic-plastic solution for the optimal thickness of a frozen soil wall considering an interaction with the surrounding rock

An elastic-plastic solution for the optimal thickness of a frozen soil wall considering an interaction with the surrounding rock

Analytical Model for the Load-Bearing Capacity Analysis of Winter Forest Roads: Experiment and Estimation

Multi-Label Classification and Automatic Damage Detection of Masonry Heritage Building through CNN Analysis of Infrared Thermal Imaging

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