Cracking Evolution and Failure Characteristics of Longmaxi Shale Under Uniaxial Compression Using Real-Time Computed Tomography Scanning

Duan, Yumin; Li, Xiao; Zheng, Bo; He, Jianming; Hao, Jinkai

doi:10.1007/s00603-019-01765-0

Cited by 59 publications

(7 citation statements)

References 21 publications

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“…In addition to the surface irregularities, defects such as joints and fissures also exist within rock masses [120][121][122]. Nondestructive CT identification can be used to obtain images of internal structures of rock mass under different environments without disturbance.…”

Section: Integration Of 3dp With 3d Scanning and Ct Scanningmentioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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In the engineering of underground construction, the discontinuous structures in rock mass have important influences on the mechanical behaviors of the subsurface of rock mass. The acquisition of mechanical parameters is the basis of rock mass engineering design, construction, safety, and stability evaluation. However, the mechanical parameters and failure characteristics of the same rock mass under different mechanical conditions cannot be obtained due to the limitations of specimen preparation techniques. In recent years, with the continuous development of 3D printing (3DP) technology, it has been successfully applied to the repetitive preparation of rock mass samples. The combinations of 3DP and other techniques, such as 3D scanning and CT scanning, provided a new approach to study the mechanical behavior of complex structural rock masses. In this study, through a comprehensive review of the technical progress, equipment situation, application fields, and challenges of the use of 3DP technology, the following conclusions were obtained: (1) 3DP technology has advantages over traditional rock mass specimen preparation techniques, and the verification of test results using 3D printed samples shows that the 3DP has broad application prospects in geotechnical engineering. (2) The combination of 3DP and other advanced techniques can be used to achieve the accurate reconstruction of complex structural rock masses and to obtain the mechanical and failure characteristics of the same rock mass structure under different mechanical boundary conditions. (3) The development of 3DP materials with high strength, high brittleness, and low ductility has become the major bottleneck in the application of 3DP in geotechnical engineering. (4) 3D printers need to meet the high precision and large size requirements while also having high strength and long-term printing ability. The development of 3D printers that can print different types of materials is also an important aspect of the application of 3DP in geotechnical engineering.

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Section: Integration Of 3dp With 3d Scanning and Ct Scanningmentioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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“…The change characteristics of the number, angles, and lengths of the cracks during the process of rock failure were obtained. Also, based on CT images and slices, Duan et al 8 qualitatively studied the crack evolution of Longmaxi shale in the horizontal and vertical direction, and the distributions patterns of crack areas during loading were revealed. In another related study, Li et al 9 examined the real-time crack evolution processes of fractured shale samples under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Crack Evolution Behaviors and Bursting Liability of Sandstone with Different Sizes: An Experimental Study

et al. 2023

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The size ranges of ore pillars play important roles in preventing the occurrences of rock burst phenomena. Due to the lack of research on the relationship between crack evolution behaviors and bursting liability of rocks with different sizes, uniaxial compression tests on sandstone with different height-todiameter ratios (H/D) were conducted. The results showed that the mechanical parameters of sandstone have obvious size effects, in which both the peak strength and peak strain decrease with increases in the H/D. Moreover, the brittle index modified value (BIM) decreased, but the impact energy index increased gradually, which indicated the increase of bursting liability. With the increases in the BIM, the overall crack strain parameters increased, thereby indicating a positive correlation. With the increase in the impact energy index, the crack strain decreased and the bursting liability became higher. Although the axial crack closure stress and axial crack damage stress increased with the increases in BIM (indicating a positive correlation), the bursting liability became increasingly smaller. The crack stress decreased with the increases in the impact energy index, and the bursting liability became stronger. The findings of this study will potentially provide experimental references for furthering the current understanding of the mechanism of rock bursts in underground coal mines in China.

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“…The rock texture and internal structure and the fracture progressive process of the soil-rock mixture can be traced and analyzed nondestructively by multiple scans during testing. A serious of studies have employed CT to study the failure mechanism, such as the fracturing behavior (including area, volume, and fractal) [14,15,18], strength behavior [16,[19][20][21], and pore structure [1,10,18,22]. Zhao et.al proposed a local threshold segmentation algorithm to describe the crack characteristics into five stages [23].…”

Section: Introductionmentioning

confidence: 99%

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

Zhang

et al. 2022

Front. Phys.

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Soil and rock mixture (SRM) consists of high-strength rock blocks and small-grained soils, which depend seriously on the rock size and the heterogeneity of structure. Because of inhomogeneous cementation between rock blocks, complex granulometric composition, and random distribution of rock blocks, these SRMs usually cause problems. Investigation of the localized deformation is critical for successful engineering designs, engineering safety assessment. In this work, uniaxial compression testing on the SRM with a rock block percentage of 40% (mass ratio) is performed under real-time computed tomography (CT) combined with digital image correlation (DIC) technology. Based on radial strain fields and shear fields, heterogeneity of strain fields and rock block motion is analyzed quantitatively by semi-variance. The results show that rock block is the main factor controlling the shear band geometry distribution. A localization strain band usually occurs along the soil and rock interfaces. From the experimental results by the DIC method, the damage factor is presented to describe the damage evolution of the SRM under uniaxial compression. The method proposed in this study can be used to quantitatively analyze the deformation characteristics of the SRM sample.

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Cracking Evolution and Failure Characteristics of Longmaxi Shale Under Uniaxial Compression Using Real-Time Computed Tomography Scanning

Cited by 59 publications

References 21 publications

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Crack Evolution Behaviors and Bursting Liability of Sandstone with Different Sizes: An Experimental Study

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

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