Mechanical behaviours of sandstone containing intersecting fissures under uniaxial compression

Xiong, Fei; Liu, Xinrong; Zhou, Xiaohan; Lin, Guangyi; Liu, Dongshuang; Han, Yafeng; Xu, Bin; He, Chunmei; Wang, Zijuan

doi:10.1016/j.jrmge.2021.09.008

Cited by 40 publications

(9 citation statements)

References 52 publications

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Section: Mechanical Propertiessupporting

confidence: 53%

“…The typical failure modes of intact sandstone under uniaxial loading can be divided into slope-failure and split-failure [43]. It can be seen in Figure 6, the failure mode of cement mortar is consistent with that of sandstone [42,44], which means the rock-like material used in this paper can well simulate the natural rock. The peak shear strength of unanchored structural planes under different normal stresses were linearly fitted, and the relationship between peak shear stress of structural plane with different JRC and normal stress was obtained, as shown in Figure 7.…”

Section: Mechanical Propertiessupporting

confidence: 53%

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Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Lin

Feng

et al. 2022

Materials

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Rock mass, the heterogeneous natural material composed of rock and discontinuities, is an important part of engineering construction. Discontinuities affect the mechanical properties of natural rock mass and further threaten the stability of rock engineering. To study the failure characteristics of anchored structure plane with different JRC, jointed specimens with four different JRC were fabricated by pouring cement mortar. Specimens were tested under four different normal loads to figure out how JRC and anchorage angle affect the mechanical properties of anchored structure plane. Besides, acoustic emission (AE) testing technology was adopted to explore the AE characteristics of anchored structural plane under shearing. The results showed that there exists a positive correlation between the peak shear strength and JRC. The undulation shape of structural plane led to an obvious downward trend in the strain softening stage of the structural plane with JRC of 6–8 and 18–20. When the anchorage angle ranged from 45° to 60°, the potentiation of bolt was the most significant. Based on the AE results, the larger the normal stress, the more likely the cumulative count curves were to enter the fast growth phase before the peak. The characteristics of b-value curves are mainly related to the topography of structural planes and whether the bolt is deformed. In the direct shear test, the cumulative proportion of shear cracks was more than 85%, which is much higher than that of tensile cracks. The variation of cumulative tensile cracks goes through three stages: slow growth, rapid growth, and slow growth. Compared with the unanchored structural plane, the variation range of real-time tensile cracks of the anchored structural plane is large, and sometimes the proportion of real-time tensile cracks may reach 80%.

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Section: Mechanical Propertiessupporting

confidence: 53%

Section: Mechanical Propertiessupporting

confidence: 53%

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Lin

Feng

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Because the particles are regarded as rigid bodies, the numerical model cannot reproduce the compaction closure stage of natural rocks [61] . Differences in internal cracks between the numerical model and laboratory samples also contribute to the discrepancies [62] . These factors may cause errors between the sample and the numerical simulation results.…”

Section: Numerical Modeling and Micro Parameters Calibrationmentioning

confidence: 99%

Study on failure mechanism of tight sandstone based on moment tensor inversion

Dang

Yang

Zhu

2023

Heliyon

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“…Particle fow simulations can abstract the particles inside the material into particle units, construct the model geometry based on such abstractions, and ensure that the model mimics the real material through contact parameter assignments and iterative analyses [19,20]. Te numerical simulation results based on the particle fow code (PFC) are consistent with the feld observations, and it provides several unique advantages in studying the development of internal joint fractures of loaded materials [21]. Song et al [22] by using the PFC verifed the results against experimental observations.…”

Section: Introductionmentioning

confidence: 99%

PFC2D-Based Analysis of the Effect of the Axial Loading Rate on the Mechanical Properties of Backfill

Kun

Wang

2023

Advances in Materials Science and Engineering

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The unloading failure process in mining engineering scenarios is similar to the loading failure process at different loading rates indoor. To clarify the relationship between the mechanical properties of backfill and the loading rate, a particle flow code 2D-based numerical simulation was performed to establish the backfill model, and tests involving five loading rates were conducted. The following results were obtained: (1) the compressive strength of the backfill body increases linearly with the increase in the loading rate. The peak strain increases in an S-shaped manner, and the modulus of elasticity first increases and then decreases. (2) The evolution of cracks is similar to that of damage energy consumption, and a smaller rate means that the curve’s inflection point arrives earlier. (3) Tensile failure is the dominant failure mode. As the rate increases, the model destruction mode transforms from single to multiple failures, and the crack distribution becomes denser. (4) The backfill body exhibits a uniform destruction form at all loading rates. However, the difference in the loading rate leads to different energy consumption growth rates and total energy consumption.

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Mechanical behaviours of sandstone containing intersecting fissures under uniaxial compression

Cited by 40 publications

References 52 publications

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Study on failure mechanism of tight sandstone based on moment tensor inversion

PFC2D-Based Analysis of the Effect of the Axial Loading Rate on the Mechanical Properties of Backfill

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