Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

Tang, Yang; Zhang, Hailong; Ren, Ting

doi:10.1177/10567895221089660

Cited by 11 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prior to the creep tests, the cameras of the three acquisition units need to be calibrated through the customized triangular prism standard target to establish a unified spatial coordinate system. More importantly, in order to calibrate and eliminate errors caused by the chamber and confining oil, a small cubic custom calibration plate was placed in the transparent chamber filled with oil to calibrate each of the three acquisition units (Tang et al., 2022). The 3 D-DIC system could calculate the displacement and strain of point, line, and plane elements on the rock surface with a precision of 0.01 pixel.…”

Section: Test Methodsmentioning

confidence: 99%

Creep behavior of sandstone under the coupling action of stress and pore water pressure using three-dimensional digital image correlation

Chen,

Xie,

et al. 2023

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Understanding the damage evolution and time-dependent property of rock creep is of great significance for predicting geohazards and evaluating the long-term stability of geotechnical structures. In this study, a three-dimensional digital image correlation system was adopted to investigate the creep behavior of sandstone under the coupling action of stress and pore water pressure. The apparent strain fields, deformation characteristics of the localization zone, and micromorphology of the fracture surface were analyzed. The results demonstrated that when the applied deviatoric stress level was above σci (crack initial stress) or σcd (crack damage stress), the increase in pore water pressure promoted creep deformation evidently, improved the creep rate significantly and shortened the time-to-failure of the rock obviously. In the radial strain field, the localized development of substantial microcracks on the rock surface was concentrated in the steady-state creep, while the microcracks interconnected to form macroscopic shear cracks that dominated the accelerating creep, and this damage evolution characteristic can be used as a precursor and early warning of rock creep failure. Besides, increasing the pore water pressure also would cause the divergence point of strain curves inside and outside the localization zone to appear earlier at the secondary creep, and produce a wider localization zone at the tertiary creep. The creep fracture surface of the rock was dominated by intergranular microcracks. Increasing the pore water pressure would result in the deterioration of the cemented structure and breakage of the cemented matrix more seriously, thus stimulating the generation of more microcracks.

show abstract

Section: Test Methodsmentioning

confidence: 99%

Creep behavior of sandstone under the coupling action of stress and pore water pressure using three-dimensional digital image correlation

Chen,

Xie,

et al. 2023

International Journal of Damage Mechanics

View full text Add to dashboard Cite

show abstract

“…The stereo-digital image correlation (stereo-DIC) technique relies on stereo vision and DIC theory [1,2] and is widely known for deformation measurements. The stereo-DIC technique has gained popularity in various fields and it has been used to investigate the mechanical properties of materials [3], analyze the damage characteristics of structures [4], control industrial processes [5], and even monitor human pulse [6]. The popularity of the stereo-DIC technique can be attributed to its advantages, which include full-field and noncontact measurement capabilities, reduced equipment acquisition costs, and exceptional precision.…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation investigation of stereo-DIC via a deep learning algorithm based on initial speckle positioning technology

Dai,

Wei,

Gao

et al. 2024

Appl. Opt.

View full text Add to dashboard Cite

For the deep-learning-based stereo-digital image correlation technique, the initial speckle position is crucial as it influences the accuracy of the generated dataset and deformation fields. To ensure measurement accuracy, an optimized extrinsic parameter estimation algorithm is proposed in this study to determine the rotation and translation matrix of the plane in which the speckle is located between the world coordinate system and the left camera coordinate system. First, the accuracy of different extrinsic parameter estimation algorithms was studied by simulations. Subsequently, the dataset of stereo speckle images was generated using the optimized extrinsic parameters. Finally, the improved dual-branch CNN deconvolution architecture was proposed to output displacements and strains simultaneously. Simulation results indicate that DAS-Net exhibits enhanced expressive capabilities, as evidenced by a reduction in displacement errors compared to previous research. The experimental results reveal that the mean absolute percentage error between the stereo-DIC results and the generated dataset is less than 2%, suggesting that the initial speckle positioning technology effectively minimizes the discrepancy between the images in the dataset and those obtained experimentally. Furthermore, the DAS-Net algorithm accurately measures the displacement and strain fields as well as their morphological characteristics.

show abstract

“…Based on wave velocity, the authors established a damage evolution model to define the damage degree of rock mass (Zhang et al., 2015). In addition, wave velocity imaging technology(Zhang et al., 2021) and Digital-image correlation (Moazzami et al., 2020, Tang et al., 2022) have been applied in deep rock engineering, where these technologies during the fracture process are used to capture and predict the growth trend of damaged areas and fracture zones. Therefore, It’s an effective method to study the damage evolution trend of tunnel surrounding rock by wave velocity during the blasting process, which is measured by physical model test.…”

Section: Introductionmentioning

confidence: 99%

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

Huang

Chen

Liu

et al. 2022

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Cyclic blasting excavation of a deep tunnel frequently disturbs the surrounding rock, and cumulative damage effect will occur in cases multiple blasts are applied. To study the damage evolution trend of tunnel surrounding rock under multiple cyclic blasting load, a self-made physical model test system was used to test cyclic blasting excavation of a tunnel under high in-situ stress. Meanwhile, according to the characteristic that the damage of rock under frequent disturbance will appear cumulative superposition, an improved Bingham creep damage constitutive model was established. The constitutive model was applied to the numerical simulation of tunnel cyclic blasting excavation, and the numerical simulation reproduced the physical model test to study the rock damage evolution laws. The results from the physical model test and the numerical simulation revealed that the process of damage evolution of rock in in-situ stress state under the impact of multiple blasting disturbances had a non-linear cumulative characteristic. In addition, the results also shed light on the relationship between the damage zone expansion and the number of cyclic blast. This paper can provide a reference for studies of the damage evolution in deep rock under blasting impact.

show abstract

Literature survey and application of a full-field 3D-DIC technique to determine the damage characteristic of rock under triaxial compression

Cited by 11 publications

References 33 publications

Creep behavior of sandstone under the coupling action of stress and pore water pressure using three-dimensional digital image correlation

Creep behavior of sandstone under the coupling action of stress and pore water pressure using three-dimensional digital image correlation

Experimental and simulation investigation of stereo-DIC via a deep learning algorithm based on initial speckle positioning technology

Physical model test and numerical simulation study of cumulative damage to deep tunnel surrounding rock under cyclic blasting load

Contact Info

Product

Resources

About