Dynamic shear fracture behavior of rocks: insights from three-dimensional digital image correlation technique

Zhang, Chenxi; Li, Diyuan; Ma, Jinyin; Zhu, Quanqi; Luo, Pingkuang; Chen, Yuda; Han, Minggang

doi:10.1016/j.engfracmech.2022.109010

Cited by 37 publications

(4 citation statements)

References 49 publications

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“…Yao et al 31 pointed out that the maximum shear stress concentrates along the vertical bridge between two notch tips and it is maximized at these tips, the fracture initiates at lower and upper notch tips, and secondary shear cracks are required to calculate K II . Moreover, by using the digital image correlation technique on SCC samples of granite, Zhang et al 34 found that new cracks first initiate from two notch tips and then propagate toward the central area in the expected shear fracture band. To apply the traditional fracture mechanics theory to the SCC specimen, the secondary shear crack is necessary for accurately determining the stress intensity factor in the fracture process, and the K IIC can be further determined precisely when a crack tip exists along the shear bridge between tips of the two horizontal notches 35 , 36 .…”

Section: Methodsmentioning

confidence: 99%

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Alneasan

Alzo’ubi

2023

Sci Rep

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The coupling environment of temperature (T) and lateral pressure at great depths promotes intact rocks to shear failure, posing a serious threat to underground engineering. Temperature effect on shear behaviour is of particular importance due to the possible mineralogical alterations in mineral composition, especially in clay-rich rocks such as mudstone that has a great affinity for water. Accordingly, the effect of thermal treatment on the shear behaviour of intact mudstone was investigated, in this study, using the Short Core in Compression (SSC) method. Three temperatures of RT, 250 and 500 °C, and four lateral pressures of 0.0, 0.5, 2.0, and 4.0 MPa were adopted. Numerical and experimental observations showed that the resulting fractures in SCC samples are shear and by increasing the lateral pressure, shear failure is promoted. Compared with other rock types such as granite and sandstone, shear properties in mudstone have only one positive trend with temperature increase up to 500 °C, by increasing T from RT to 500 °C, mode II fracture toughness, peak friction angle, and the cohesion increased by about 15 to 47%, 4.9%, and 47.7%, respectively. The bilinear Mohr–Coulomb failure criterion can be used to model the peak shear strength behaviour of intact mudstone before and after thermal treatment.

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Section: Methodsmentioning

confidence: 99%

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Alneasan

Alzo’ubi

2023

Sci Rep

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“…IG fractures and TG fractures are related to the energy stored before the sample breaks. IG fractures are caused by less energy consumption during the fracture process, while TG fractures are caused by more energy consumption during the fracture process (Abdollahi et al 2012;Zhang et al 2023;Zhou et al 2022). TC-2 experienced no significant stress releases in the early stage, and large stress releases only occurred after the stress reached its peak, resulting in more energy consumption during the fracture process, which caused more TG fractures to occur, which is completely consistent with the trend of the stress-strain curves.…”

Section: Validation Of the Triaxial Testmentioning

confidence: 99%

Influence analysis of complex crack geometric parameters on mechanical properties of soft rock

Zhao,

He,

Jiang

et al. 2023

Int J Coal Sci Technol

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Soft rocks, such as coal, are affected by sedimentary effects, and the surrounding rock mass of underground coal mines is generally soft and rich in joints and cracks. A clear and deep understanding of the relationship between crack geometric parameters and rock mechanics properties in cracked rock is greatly important to the design of engineering rock mass structures. In this study, computed tomography (CT) scanning was used to extract the internal crack network of coal specimens. Based on the crack size and dominant crack number, the parameters of crack area, volume, length, width, and angle were statistically analyzed by different sampling thresholds. In addition, the Pearson correlation coefficients between the crack parameters and uniaxial compression rock mechanics properties (uniaxial compressive strength UCS, elasticity modulus E) were calculated to quantitatively analyze the impact of each parameter. Furthermore, a method based on Pearson coefficients was used to grade the correlation between crack geometric parameters and rock mechanical properties to determine threshold values. The results indicated that the UCS and E of the specimens changed with the varied internal crack structures of the specimens, the crack parameters of area, volume, length and width all showed negative correlations with UCS and E, and the dominant crack played an important role both in weakening strength and stiffness. The crack parameters of the angle are all positively correlated with the UCS and E. More crack statistics can significantly improve the correlation between the parameters of the crack angle and the rock mechanics properties, and the statistics of the geometric parameters of at least 16 cracks or the area larger than 5 mm2 are suggested for the analysis of complex cracked rock masses or physical reproduction using 3D printing. The results are validated and further analyzed with triaxial tests. The findings of this study have important reference value for future research regarding the accurate and efficient selection of a few cracks with a significant influence on the rock mechanical properties of surrounding rock mass structures in coal engineering.

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“…Many traditional methods struggle with the fuzzy boundaries and complex backgrounds in rock microscopic images, leading to inaccurate segmentation results that may affect subsequent predictions of mechanical properties [16][17][18][19]. Furthermore, the extraction of parameters of rock microstructures often lacks effective automation tools, limiting the capability for large-scale data processing and analysis, thereby affecting the construction and optimization of prediction models [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Predicting and Analyzing Rock Mechanical Properties Using Image Processing Techniques

Hao,

Wang,

Wang

et al. 2024

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Predicting the mechanical properties of rocks is a critical technical issue in the fields of geological engineering design, disaster prevention, and resource exploration. Traditional macroscopic physical experimental methods face many limitations in analyzing rock mechanical properties, struggling to meet the current demands for efficiency, low cost, and microscopic level analysis. This study is based on image processing technology, aiming to improve the accuracy and efficiency of predicting rock mechanical properties through the quantitative analysis of high-resolution microscopic images of rocks. Although the application of image processing technology in the field of rock mechanics has made some progress, existing methods still face challenges in accuracy and automation when segmenting microscopic images of rocks. Considering these shortcomings, this paper proposes a novel rock microscopic image segmentation strategy that combines the minimum threshold method, Laplacian histogram method, and maximum interclass variance method. Additionally, this study explores methods for extracting microscopic structural parameters of rocks and analyzes the relationship between these parameters and rock mechanical properties. The results indicate that the proposed methods effectively improve the accuracy of identifying microscopic structures of rocks, thereby enhancing the understanding of rock mechanical behavior, which has substantial significance for scientific decision-making in geological engineering.

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Dynamic shear fracture behavior of rocks: insights from three-dimensional digital image correlation technique

Cited by 37 publications

References 49 publications

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Extensive experimental investigation on the effect of thermal treatment and lateral pressure on the shear behavior of intact mudstone

Influence analysis of complex crack geometric parameters on mechanical properties of soft rock

Predicting and Analyzing Rock Mechanical Properties Using Image Processing Techniques

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