Investigation of Coal Failure Characters Based on Jet Energy and Impact Frequency During Particle Jets Coal Breaking

Chen, Changjiang; Liu, Yong; Tang, Jiren; Wang, Wen

doi:10.1007/s00603-022-02853-4

Cited by 19 publications

(4 citation statements)

References 35 publications

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“…Yongping Wu 1,2,3 , Yepeng Tang 1,2,3* , Panshi Xie 1,2,3 , Bosheng Hu 1,2,3 , Ding Lang 1,2,3 & Hongwei Wang 1,2,3 To solve the problem that the macroscopic deformation and failure of coal-rock medium under external loads are easy to be observed while the internal stress transfer mode and path are unclear. Based on the discrete element idea, the numerical models for pure coal or rock samples and coal-rock combination samples with different lithologies and combination methods under concentrated force are established by PFC2D software.…”

Section: Internal Stress Transfer Characteristics Of Coal-rock Medium...mentioning

confidence: 99%

“…In recent years, many scholars at home and abroad have carried out a lot of studies on coal-rock combination samples. Zhang 2 and Chen [3][4][5] studied the influence of coal and rock properties and combination methods on the mechanical properties and failure characteristics of coal-rock combination samples through uniaxial loading experiments. Yin et al 6 studied the influence of coal-rock height ratio on the strength characteristics of the coal-rock combination samples, and pointed out that the strength of the combinations decreases with the increase of coal height.…”

Section: Internal Stress Transfer Characteristics Of Coal-rock Medium...mentioning

confidence: 99%

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Internal stress transfer characteristics of coal–rock medium under concentrated force based on particle flow method

Wu,

Tang,

Xie

et al. 2024

Sci Rep

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To solve the problem that the macroscopic deformation and failure of coal–rock medium under external loads are easy to be observed while the internal stress transfer mode and path are unclear. Based on the discrete element idea, the numerical models for pure coal or rock samples and coal–rock combination samples with different lithologies and combination methods under concentrated force are established by PFC2D software. Then the influence of coal or rock strength and combination methods on the internal stress transfer law and distribution evolution characteristics of coal–rock medium are discussed from the perspectives of macroscopic stress and mesoscopic force chain, respectively. The results showed that under concentrated load, the macroscopic stress transfer paths within pure coal or rock samples and coal–rock combination samples are primarily in the form of ‘point source radiation’. However, when transferring between coal–rock interfaces, there is a certain interface effect. For pure coal or rock samples, differences in lithology does not change the transfer rules and macro distribution patterns of internal stress, but it can cause changes in internal unit transfer stress value and local area transfer direction. For coal–rock combination samples, the greater the difference in lithology between the two sides of the interface, the more likely the interface effect will occur. In addition, the internal stress transfer is also influenced by the relative stratigraphic relationships of coal and rock. When the stress is transferred from a higher-strength rock to a lower-strength coal mass, the interface effect will be more significant. However, regardless of the combination pattern, the locations where significant stress surges occur are always within the higher strength rock mass near the interface. The findings are helpful to understand the mechanical properties and failure mechanism of mining coal and rock mass, and provide a theoretical basis for the study of the mining-induced mechanical behavior of the floor under the action of the coal pillar.

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Section: Internal Stress Transfer Characteristics Of Coal-rock Medium...mentioning

confidence: 99%

Section: Internal Stress Transfer Characteristics Of Coal-rock Medium...mentioning

confidence: 99%

Internal stress transfer characteristics of coal–rock medium under concentrated force based on particle flow method

Wu,

Tang,

Xie

et al. 2024

Sci Rep

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“…Thereby, improving the permeability of unconventional natural gas reserves has become an urgent issue. Over the last few years, there have been numerous research studies with respect to methods to improve the efficiency of unconventional natural gas extraction, among which hydraulic fracturing is the most widely used stimulating technology in unconventional natural gas extraction. − However, some disadvantages still exist, which may hinder the widespread application of this technology. For instance, the consumption of fresh water may result in waste of water resources and may lead to formation permeability damage .…”

Section: Introductionmentioning

confidence: 99%

Simulation Investigation on the Structure and Its Influence on the Impinging Pressure of the Carbon Dioxide Jet

Liu

2023

ACS Omega

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An improved understanding of the mechanisms of SC-CO2 jet drilling technology is important for the application of this new technology. The flow field structure and dynamic fluctuation of SC-CO2 jets are the key factors affecting the jet erosion performance. To improve the erosion performance of the SC-CO2 jet, it is necessary to study the relationship between the different flow fields of the jet. In this study, a numerical simulation model for SC-CO2 jet drilling technology is established. Based on the modified real-gas model, the pressure distribution and flow field characteristics of the SC-CO2 jet were obtained by the simulation investigation, and the reliability of the model was verified. The results show that the flow field structure of a supercritical CO2 jet has typical compressible flow field characteristics. As the jet is fully expanded, its pressure fluctuation is slight and less affected by the distance between the nozzle and the wall. When the jet is in the state of under-expansion, the flow field structure characteristics have a significant impact on the pressure distribution and peak pressure. At the same time, when the distance is large, when nozzle pressure ratio = 5, the pressure ratio has a more significant impact on the flow field and the pressure peak and distribution. The pressure distribution of different flow fields should be fully considered in the application.

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“…The particle-impact-assisted rock-breaking method has the advantages of low pressure, low energy consumption, and broad engineering application prospects. It uses a high-speed medium to accelerate particles for a high impact kinetic energy [15][16][17][18] . After impacting the rock, the impact stress wave propagates in the rock and promotes an expansion of the original cracks in the rock to crush the rock 19 .…”

Section: Introductionmentioning

confidence: 99%

Influence of confining pressure on rock fracture propagation under particle impact

Wang,

Li,

Niu

et al. 2023

Preprint

Self Cite

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Revealing the influence of confining pressure on the propagation and formation mechanism of rock cracks under particle impact is significant to deep rock excavation. In this study, we conducted laboratory testing and numerical simulations to analyze the stress and crack field evolution in rock under particle impact. The results demonstrate that after particles impact, a fracture zone and intergranular main crack propagation zone are formed in the rock. The shear stress and tensile stress caused by compressive stress are the main reasons for the formation of the fracture zone, while the formation of the intergranular main crack propagation zone is mainly due to tangential derived tensile stress. The confining pressure induces prestress between rock particles such that the derived tensile stress needs to overcome the initial compressive stress between the particles to form tensile fractures. And the increase in the confining pressure leads to increases in the proportion of shear cracks and friction effects between rock particles, resulting in an increase in energy consumption for the same number of cracks. From a macroscopic perspective, the confining pressure can effectively inhibit the generation of cracks.

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Investigation of Coal Failure Characters Based on Jet Energy and Impact Frequency During Particle Jets Coal Breaking

Cited by 19 publications

References 35 publications

Internal stress transfer characteristics of coal–rock medium under concentrated force based on particle flow method

Internal stress transfer characteristics of coal–rock medium under concentrated force based on particle flow method

Simulation Investigation on the Structure and Its Influence on the Impinging Pressure of the Carbon Dioxide Jet

Influence of confining pressure on rock fracture propagation under particle impact

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