Study on damage evolution of intact and jointed marble subjected to cyclic true triaxial loading

Gao, Yaohui; Feng, Xia‐Ting

doi:10.1016/j.engfracmech.2019.05.011

Cited by 56 publications

(27 citation statements)

References 21 publications

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“…As point (e pc , 1) is also on the D versus e p curve, these material constants (a, b, and c) have a close relationship with the parameter e pc , which is Fig. 7 Relationships between the damage variables represented by irreversible strains for the intact marble in the three principal stress directions and the equivalent irreversible strains (Gao and Feng 2019) defined as the critical equivalent irreversible strain at the residual stage. Consequently, e pc may also be defined by…”

Section: Irreversible Strain Characteristicsmentioning

confidence: 85%

“…8 Relationships between the strain energy of the intact marble and equivalent irreversible strain: (a) elastic energy and (b) dissipated energy. (Gao and Feng 2019)…”

Section: Strain Energy Characteristicsmentioning

confidence: 99%

“…Typical stress-strain curve from the true triaxial cyclic loading test under σ 2 ¼ 150 MPa and σ 3 ¼ 30 MPa (Gao and Feng 2019). …”

mentioning

confidence: 99%

“…Relationships between the damage variables represented by the dissipated energy of the intact marble and equivalent irreversible strain(Gao and Feng 2019) …”

mentioning

confidence: 99%

“…The predefined stress states and material constants fitted to the relationships between the damage variables and equivalent irreversible strains for intact marble(Gao and Feng 2019) …”

mentioning

confidence: 99%

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Damage and Failure of Hard Rocks Under True Triaxial Compression

Kong

Gao

Zhang

2020

Handbook of Damage Mechanics

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To reveal the effect of intermediate principal stress on the damage and failure of hard rocks, the failure evolution of hard rocks under true triaxial compression is reviewed, based on the previous study. From the viewpoint of crack growth under true triaxial compression, different fracture evolution stages of hard rocks, including the elastic stage, stable growth stage, and unstable growth stage, are introduced. Additionally, the effect of the intermediate principal stress on the crack stress thresholds is summarized. It is found that as the intermediate principal stress increases, its effect will first restrict and then promote crack propagation. The energy evolution of the rock cracking process under true triaxial compression is also analyzed. The damage evolution is quantified by damage

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Section: Irreversible Strain Characteristicsmentioning

confidence: 85%

“…8 Relationships between the strain energy of the intact marble and equivalent irreversible strain: (a) elastic energy and (b) dissipated energy. (Gao and Feng 2019)…”

Section: Strain Energy Characteristicsmentioning

confidence: 99%

“…Typical stress-strain curve from the true triaxial cyclic loading test under σ 2 ¼ 150 MPa and σ 3 ¼ 30 MPa (Gao and Feng 2019). …”

mentioning

confidence: 99%

“…Relationships between the damage variables represented by the dissipated energy of the intact marble and equivalent irreversible strain(Gao and Feng 2019) …”

mentioning

confidence: 99%

“…The predefined stress states and material constants fitted to the relationships between the damage variables and equivalent irreversible strains for intact marble(Gao and Feng 2019) …”

mentioning

confidence: 99%

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Damage and Failure of Hard Rocks Under True Triaxial Compression

Kong

Gao

Zhang

2020

Handbook of Damage Mechanics

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Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Xia

et al. 2022

Energy Science & Engineering

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In underground engineering such as mining and tunnel excavation, the rock mass is often subjected to repeated loading and unloading stress environments. Herein, true triaxial cyclic loading and unloading tests are carried out on fine sandstone and medium-fine sandstone specimens with cracks of different angles. The test results show that the mechanical properties of fine sandstone and medium-fine sandstone samples show obvious differences, and the crack angle has a significant effect on the mechanical properties of the sandstone specimen. During the experimentation, the expansion phenomenon of medium-fine sandstone is more obvious than that of fine sandstone, and its brittleness is also weaker. The damage law of the sample has nothing to do with the type of sandstone. The damage caused by the stress in the σ 1 direction varies linearly with the cumulative damage of the specimen, however, the damage caused by the directions of σ 2 and σ 3 grow nonlinearly in terms of the cumulative damage of the specimen. The hysteretic loop dissipated energy of the same type of sandstone specimens at different angles are dissimilar, and the dissipated energy increases with the increase of the crack angle. Based on the equivalent irreversible strain and the hysteretic loop dissipated energy, the damage law of the rock strength is analyzed. The obtained results reveal that the index based on the equivalent irreversible strain is helpful in exploring the damage degree of rock in the initial stage of cyclic loading and unloading. Furthermore, the damage index established based on the energy dissipation concept is beneficial to predicting the damage and failure law of rock in the advanced stage of loading.

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Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading

Tang

Zhao

Zhou

et al. 2020

Energy Science & Engineering

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With the gradual depletion of shallow resources, the energy exploration depth has been increasing and condition becomes complex. 1 Consequently, the explorations face increasingly harder rocks with higher strengths. Breaking hard rock rapidly in petroleum and mineral exploration is a popular and significant topic. 2-6 However, the current technologies cannot meet the demands of quick drilling. It is necessary to develop a more efficient technology for hard rock exploration. To achieve this goal, the assisted ultrasonic vibration technique (ultra-high-frequency cyclic loading), combined with the traditional drilling method, was first introduced by researchers at Aberdeen University. 7 To implement this technology more effectively, studies were conducted on rock-breaking characteristics under ultrasonic vibrations and optimization of the vibration parameters. The studies conducted by Wiercigroch et al 8 showed that the high-frequency axial vibration significantly enhanced the breaking rates compared to the traditional method. Subsequently, uniaxial compressive strength experiments were conducted on fine granite by Yin et al 9 to demonstrate that there exists a static force threshold for this technology. They found that the optimal value range of static loading was 200-300 N. An

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Study on damage evolution of intact and jointed marble subjected to cyclic true triaxial loading

Cited by 56 publications

References 21 publications

Damage and Failure of Hard Rocks Under True Triaxial Compression

Damage and Failure of Hard Rocks Under True Triaxial Compression

Analysis of damage characteristics of fine and medium‐fine cracked sandstones under a complex stress path

Discrete element simulation for investigating fragmentation mechanism of hard rock under ultrasonic vibration loading

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