Dynamic three-dimensional imaging and digital volume correlation analysis to quantify shear bands in grus

Li, Chengsheng; Kong, Lingwei; Shu, Rongjun; An, Ran; Jia, Hongbiao

doi:10.1016/j.mechmat.2020.103646

Cited by 24 publications

(5 citation statements)

References 31 publications

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“…Gylland et al [21] analyzed the inner structure of shear bands in sensitive clays using the computed tomography (CT) measurements. Among the testing methods mentioned above, the most effective testing methods for investigating shear bands are the DIC technique and CT measurements [22,23]. Compared with DIC, which can only measure the surface deformation of specimens, CT can measure the inner deformation of specimens non-destructively, rendering its superior over DIC.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Shear Band in Plane Strain Compression of Naturally Structured Clay with a High Sensitivity

Liu

Kong

et al. 2022

Applied Sciences

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The formation of the shear band is associated with the failure of soil. However, there has been relatively little investigation on the evolution of shear bands in naturally structured clay with a high sensitivity. In this study, undrained plane strain compression tests, digital image correlation (DIC) analyses, and scanning electron microscopy (SEM) tests were performed to investigate the characteristics of shear bands in naturally structured clay. The basic mechanical properties and stress–strain relationships show that naturally structured clay exhibits a strong structure and high sensitivity. Compared with plane strain compression tests under low confining pressure, more localized shear bands emerge in the specimens during the tests under high confining pressures; however, when the specimens fail, only one shear band is fully developed, and the local deformation in the developed shear band is much larger than those in other localized shear bands. Moreover, the local stress–strain relationships inside and outside the shear band show distinct discrepancies. The SEM results show distinct micro-structures of clays inside and outside the shear band, which are caused by the development of the shear band. The findings in this work provide new insight into the failure of structured clay.

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Section: Introductionmentioning

confidence: 99%

Evolution of Shear Band in Plane Strain Compression of Naturally Structured Clay with a High Sensitivity

Liu

Kong

et al. 2022

Applied Sciences

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“…Lee and Ji [20] analysed the experimental data of polymer material under tensile loading using DVC technique. Li et al employed the DVC algorithm in the mechanical test of soil [21] [22]. DVC-based deformation measurement has been reported to be applied on the magnetic resonance imaging (MRI) of intervertebral discs both ex vivo [23] and in vivo [24].…”

Section: Introductionmentioning

confidence: 99%

Impact of Speckle Deformability on Digital Imaging Correlation

Wang,

Wu,

Zhu

et al. 2024

IEEE Access

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Digital Image Correlation (DIC) has been widely used as a non-contact deformation measurement technique. Nevertheless, its accuracy is greatly affected by the speckle pattern on the specimen. To systematically evaluate how speckle deformability affects the precision of DIC algorithms. In this study, a test dataset of 2D speckle patterns with various prescribed deformation fields was numerically generated, containing two categories of speckles, i.e., the deformable and the non-deformable (rigid) ones. This dataset was used to evaluate the performance of inverse compositional Gauss-Newton (ICGN)-based DIC algorithms with two types of shape function (first-order and second-order), in the different scenarios of the deformation field. The results showed that imaging noise had a significant influence on the DIC algorithm. The first-order shape function (ICGN-1) performed better when tracking the simple linear deformation field. While the second-order shape function (ICGN-2) was proved to perform better on nonlinear deformations. Moreover, the deformability of the speckle was found to have an obvious impact on the performance of the DIC algorithm. ICGN-2 could effectively reduce so-called speckle rigidity induced (SRI) error. Conclusively, ICGN-2 should be chosen as priority, because of its feasibility on non-linear deformation fields and speckle rigidity. While in the linear deformation scenarios, ICGN-1 was still a robust and efficient method.

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“…To study the particular property of weathered granite, many studies have been carried out since the 1960s (Lee, 1965). The research emphasis developed from the engineering qualitative classification (Irfan and Dearman, 1978), the basic physical properties (Lee, 1965), and the deformation/strength characteristics (Lee and Coop, 1995) to the hydraulic/mechanical properties of unsaturated weathered granite (Xiong et al, 2022), the microstructure distribution of the intact weathered granite (Shang et al, 2015) and the relationship between the microstructure and deformation of weathered granite (Li et al, 2020). In addition, the properties of weathered granites were compared with other geomaterials and any fruitful research results provide important new insights for reference.…”

Section: Introductionmentioning

confidence: 99%

The Small Strain Stiffness Properties of Undisturbed Weathered Granite With Different Weathering Degrees

Wang

Kong²,

Li³

et al. 2022

Front. Earth Sci.

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To evaluate the small strain stiffness properties of undisturbed weathered granite, the circular computer numerical control (CNC) abrasive wire sawing technology was applied to weathered granite sample processing and a series of resonance column tests were carried out to study the effects of weathering degree and effective consolidation pressure on dynamic shear modulus of undisturbed weathered granite. The results show that the degree of weathering and effective consolidation pressure have significant effects on the small strain stiffness properties of weathered granite. The samples with lower weathering degrees have higher dynamic shear modulus under the same effective consolidation pressure. The maximum dynamic shear modulus of samples with higher weathering degrees is more sensitive to effective consolidation pressure. Besides, a comparison between the experimental results with the previous results from other researchers indicates that the dynamic shear modulus ratio of weathered granite in the study area exceeds the parameter range obtained from others. According to the experimental results, a mathematical model of the relation between corrected standard penetration test (SPT) N’ value and dynamic shear modulus was established, and besides, the variation range of dynamic shear modulus ratio of weathered granite in the study area was given, which may provide a reference for dynamic stability analysis of engineering in the study area.

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Dynamic three-dimensional imaging and digital volume correlation analysis to quantify shear bands in grus

Cited by 24 publications

References 31 publications

Evolution of Shear Band in Plane Strain Compression of Naturally Structured Clay with a High Sensitivity

Evolution of Shear Band in Plane Strain Compression of Naturally Structured Clay with a High Sensitivity

Impact of Speckle Deformability on Digital Imaging Correlation

The Small Strain Stiffness Properties of Undisturbed Weathered Granite With Different Weathering Degrees

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