Impact of Particle Shape on Crushing Behaviour of Rock Particles Using X-ray Micro-CT Testing and DEM Modelling

Zhao, Xiaolong; Wu, Yunlong; Jia, Yun; Bian, Hanbing; Bur, Nicolas; Zhu, Jungao; Colliat, Jean-Baptiste

doi:10.1007/s00603-024-03916-4

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…Techniques such as computed tomography (CT) scanning 11 , scanning electron microscopy (SEM) 12 , acoustic emission testing, and nuclear magnetic resonance (NMR) detection 13 can effectively analyze and understand the microscopic damage characteristics of rocks. In recent years, NMR detection technology has been widely used in medicine, geotechnical engineering, and materials.…”

Section: Introductionmentioning

confidence: 99%

Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

Wang,

Zou,

et al. 2024

Preprint

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To investigate the cumulative damage characteristics and unstable failure mechanism of rock samples under cyclic inclined plane impact loads, an experimental device simulating inclined plane impact, and a drop hammer loading test machine were used to conduct cyclic low-energy impact tests on sandstone samples with five inclined plane angles. The porosity of the sandstone samples was measured using a low magnetic field nuclear magnetic resonance (NMR) detection system, obtaining the porosity, T2 spectrum distribution, and NMR images of the samples after different numbers of impacts at different slope angles. Under the action of cyclic inclined plane impact loads, the larger the slope angle, the smaller the extent of sample damage. The rock samples with a large inclined angle is more inclined to rupture at the tip of the inclined plane, mainly primarily characterized by shear-tensile failure. The porosity of the small slope angle changes sharply, resulting in greater damage. Under the same impact energy, as the number of impacts increases, the porosity of the samples first decreases, then increases, and then decreases again. This is manifested by large porosity closure after the first impact, followed by small pore expansion into large pores after 5 impacts, leading to gradual degradation of the samples until failure. The main factor affecting the rock samples is the presence of large-sized pores with a spectral area of over 95%. As the number of impacts increases, the quantity of small pores decreases, while the size and quantity of large pores both increase, indicating continuous deterioration of rock sample.

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Section: Introductionmentioning

confidence: 99%

Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

Wang,

Zou,

et al. 2024

Preprint

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Contributions to Rock Fracture Induced by High Ground Stress in Deep Mining: A Review

An,

2024

Rock Mech Rock Eng

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Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

Wang,

Zou,

et al. 2024

Sci Rep

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The ore pass wall in underground mines is often damaged by the impact and wear caused by unloaded ores. Studying the mechanisms of rock damage and failure under different impact angles can provide technical insights for the design and maintenance of the ore passes. This study employed an inclined impact experimental device along with a drop hammer loading test machine to perform cyclic low-energy impact tests on sandstone samples at five different inclined plane angles. The porosity of the rock samples was measured using a nuclear magnetic resonance (NMR) detection system, which provided data on porosity, T 2 spectrum distribution, and NMR images of the samples after different numbers of impacts at different slope angles. The results indicate that: (1) Under cyclic inclined plane impact loading, an increase in the inclination angle, leads to reduced damage to the rock sample. The rock sample impacted at a 45° inclined plane exhibited the most severe damage. Rock samples with large inclination angles are more prone to experience rupture fractures at the tip of the inclined plane, primarily due to shear-tensile failure. The porosity changes dramatically at initially slope angles, resulting in greater damage. (2) As the number of impacts increases, the porosity of the samples first decreases, then increases, and subsequently decreases again. This progression corresponds to the closure of large pores following the first impact, followed by the expansion of micropores into macropores after 5 impacts, ultimately leading to gradual degradation of the samples until failure. (3) As the number of impacts increases, new cracks form within the rock sample and small cracks expand. Despite an increase in the number of micropores, the macropores still exert a significant influence on the rock samples, with the macropore spectrum area accounting for over 95%.

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Impact of Particle Shape on Crushing Behaviour of Rock Particles Using X-ray Micro-CT Testing and DEM Modelling

Cited by 3 publications

References 58 publications

Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

Contributions to Rock Fracture Induced by High Ground Stress in Deep Mining: A Review

Cumulative damage characteristics of rock samples under cyclic low energy inclined plane impact

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