Mechanical properties and fracture evolution process of Beishan granite under tensile state

Wang, Chaosheng; Liu, J. F.; Zhao, Yanxiu; Han, Song

doi:10.1007/s10064-022-02765-1

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…This rate is determined to be 0.05 mm/min, which is approximately 10 N/s. Similar to the direct tensile tests reported in [24,59,67], abrupt brittle fracture was the predominant failure mode. The fracture appeared at the cross-section close to the taper outside the gripping device (Figure 4e).…”

Section: Wedge-type Gripsupporting

confidence: 76%

Characterizing Tensile Strength of Building Sandstone via Uniaxial Tensile, Compressive, and Flexural Bending Tests

Guan

Huang

et al. 2023

Materials

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Sandstone is widely used a construction and building material. However, its uniaxial tensile strength (UTS) is not adequately understood. To characterize the uniaxial tensile strength of natural sandstone, three groups of specimens were fabricated for four-point bending, uniaxial compressive, and tensile tests. To characterize the evolution of the stress–strain profiles obtained via these tests, representative expressions were developed in terms of normalized strain and strength. The magnitude of the uniaxial tensile strength exceeded that of the four-point bending strength, indicating that the uniaxial tensile strength cannot be represented by the four-point bending strength. The experimental ratio of uniaxial tensile and compression strength (33–41) was underestimated by the empirical expressions reported in the literature. The suggested correction coefficient for the FBS is 0.25. The compressive modulus (Ec) was generally identical to the experimental results published in the literature, whereas the tensile modulus (Et) was overestimated. The experimental modular ratio, Et/Ec, ranged from 0.12 to 0.14; it was not sensitive to Poisson’s ratio, but it increased slightly with the compressive modulus. This work can serve as a reference for computing the load-bearing capacity of sandstone components under tension.

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Section: Wedge-type Gripsupporting

confidence: 76%

Characterizing Tensile Strength of Building Sandstone via Uniaxial Tensile, Compressive, and Flexural Bending Tests

Guan

Huang

et al. 2023

Materials

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“…After more than 30 years of repeated evaluations and demonstrations, the Beishan area in Gansu Province was eventually designated as one of the pre-selected sites for the high-level radioactive waste repository in China [17]. Many scholars have conducted research on the mechanical characteristics of Beishan granite, and have achieved rich results through analysis of spatiotemporal features, waveform, energy, amplitude and b-value (b is a parameters of magnitude and frequency) based on AE [18][19][20][21]. Those researches have mostly focused on the characteristics of acoustic emissions during the failure process of granite, but there is less research on the development process of the internal fracture cluster of Beishan granite.…”

Section: Introductionmentioning

confidence: 99%

Identification and Evolutionary Characteristics of Major Fractures in Beishan Granite

Wang,

Wan,

Ren

et al. 2023

Applied Sciences

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Identification of major fractures is a common problem in underground engineering. Research on the identification and evolutionary characteristics of major fractures are mainly based on high-level waste underground repositories. In this paper, a triaxial acoustic emission (AE) experiment was carried out, and methods such as fractal theory and machine learning were utilized to analyze the AE characteristics during rock failure. The evolution of fracture clusters within the rock was studied, and the AE characteristics of different fracture clusters were analyzed. The results show that as the confining pressure increases, fracture categories reduce, the proportions of major and non-major fractures decrease, and the proportion of outlier fractures increases. During the initial phase of AE, the proportion of major fractures significantly fluctuates, while during the active phase of AE, the proportion of major fracture acoustic emissions generally increases. The proportion of major fracture acoustic emissions remains relatively constant during the calm phase, and in the destructive phase, the proportion of major fractures slightly decreases. The variations in the b-value can be divided into three stages: increase, decrease, and secondary increase. A rock major fracture identification model was established based on BP neural network, and the model’s accuracy rate of major fracture identification was 87.22%.

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Effects of particle shape on mechanical responses of rock materials using bonded-particle model

Bai,

Zhang,

Konietzky

2024

Computers and Geotechnics

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Mechanical properties and fracture evolution process of Beishan granite under tensile state

Cited by 7 publications

References 39 publications

Characterizing Tensile Strength of Building Sandstone via Uniaxial Tensile, Compressive, and Flexural Bending Tests

Characterizing Tensile Strength of Building Sandstone via Uniaxial Tensile, Compressive, and Flexural Bending Tests

Identification and Evolutionary Characteristics of Major Fractures in Beishan Granite

Effects of particle shape on mechanical responses of rock materials using bonded-particle model

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