Dynamics behaviour of gas-bearing coal subjected to SHPB tests

The development law of mining cracks in shallow coal seams under gully topography was used as the research base to analyze the development characteristics of mining cracks in the 5-2 coal mining face of Anshan Coal Mine, and the weak strength was established. The basic top force model under the action of the overburden is the “nonuniformly distributed load beam” structure model. Through similar simulation research and theoretical calculation analysis, the fracture development law of the working face passing through the valley is studied. Based on the mechanical analysis of the beam structure with nonuniform load, the discriminant conditions of the stability of the bearing structure of the bedrock are derived, the calculation formulas of the parameters such as the pressure, shear force, and the ultimate span of the basic roof at both ends are determined, the influence law of the thickness and slope change of the weak strength overburden on the mining crack spacing is revealed, and the influence of the slope of the weak strength overburden on the weighting step distance on the beam with nonuniform load is obtained. The phenomenon is that the burial depth has a great influence on the step distance of weighting. The practice shows that the distance between the mining-induced fractures determined by the nonuniformly distributed load beam model and the periodic weighting step, the height of fracture development, and the buried depth are approximately the same; the mining-induced fractures in the overburden develop and evolve periodically with the failure and instability of the bedrock. The research results will clarify the development mechanism of surface cracks in the gully mining area, which is of great significance to reduce terrain disasters.

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“…), and the evolution law during working face advancement. All data are recorded in real time [21,22].…”

Section: Similar Simulation Experiments Analysismentioning

confidence: 99%

Study on Development Law of Mining‐Induced Slope Fracture in Gully Mining Area

Yang

Zhang

et al. 2021

Advances in Civil Engineering

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“…Zongyuan Ma was studied deeply buried under the condition of high in situ stress and the complex stress intensity under the condition of the intermediate principal stress to the intact rock material static or dynamic mechanical behavior and strength characteristics analyzed the deep rock engineering in high ground stress and high speed impact additional impact the destruction mechanism of pressure and damage to large deep rock stress in the process of mining provides the theory support [28][29][30]. Li Peng et al analyzed the difference of tectonic stress field between shallow and deep engineering areas by studying the measured in situ stress data of shallow and deep areas after optimized treatment, providing theoretical support for disaster prevention and mitigation in deep mining [31][32][33][34]. e exploitation and utilization of coal resources play a decisive role in promoting the rapid economic development of Shandong Province.…”

Section: Introductionmentioning

confidence: 99%

Study on In Situ Stress Distribution Law of the Deep Mine: Taking Linyi Mining Area as an Example

Chen

Wang

et al. 2021

Advances in Materials Science and Engineering

114

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The variation of the in situ stress state is closely related to various factors. In situ stress state is also an important indicator to guide mining production. The study of in situ stress measurement and its distribution characteristics has always been a basic and very important work in mine production. In this study, the deep mines of Linyi Mining Area were considered as the research object. In this regard, the stress distribution law of each mine was studied. We found that the relationship between principal stresses was σH > σ v > σh, which belongs to the strike-slip stress regime. In this stress regime, the lateral Earth pressure coefficient was greater than one, and the magnitude of the three principal stresses all showed an increasing trend with the increase of depth. The maximum horizontal stress direction of the Gucheng Coal Mine, Guotun Coal Mine, and Pengzhuang Coal Mine was NW-SE under the influence of regional geological structure, while the maximum horizontal stress direction of Wanglou Coal Mine was NE-SW under the influence of local geological structure. Besides, the relationship between mine in situ stress and mine geological structure, the impact of original rock stress on stope stability, and the effect of original rock stress on floor water inrushing were also investigated. We believe that the research results are beneficial to mine disaster prevention and safety production.

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“…ese dynamic responses include the variation of density, wave velocity, porosity, strength, scale effect, bedding effect, water effect, and energy dissipation [16][17][18][19][20]. Klepaczko et al studied the elastic and viscoelastic properties of Nova Scotia coal over a wide range of strain rates (quasistatic to impact) [21].…”

Section: Introductionmentioning

confidence: 99%

Experiments on Mechanical Response and Energy Dissipation Behavior of Rockburst‐Prone Coal Samples Under Impact Loading

Tang

Qin³

et al. 2021

Shock and Vibration

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To reveal the dynamic mechanical response and energy dissipation behavior of rockburst-prone coal samples under impact loading, the compressive experiments on Xinzhouyao coals (prone) and Machang coals (nonprone) under different impact loadings were carried out using the Split Hopkinson Pressure Bar (SHPB). The dynamic mechanical properties were studied, including dynamic elastic modulus, strain rate, peak stress, peak strain, dynamic increment factor, and energy dissipation. The results show that the dynamic elastic modulus, peak stress, and peak strain of both prone and nonprone coals perform an obvious correlation with the increase of strain rate. The strain rate strengthening effect on the dynamic elastic modulus and compressive strength of rockburst-prone coal samples are more significant, reflected by the greater increment with the increase of strain rate, while the dynamic increment factors of both prone and nonprone coals show apparent strain rate strengthening. The incident, reflected, and transmitted energy of both two coals linearly increases with the impact velocity, although the increased rate may be different. The dissipated energy of rockburst-prone coal samples increases faster, while the rate of the increase of the dissipated energy is more stable with strain rate. The results may provide an important reference for revealing the failure law of engineering-scaled coal mass suffered by rockburst.

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Dynamics behaviour of gas-bearing coal subjected to SHPB tests

Cited by 64 publications

References 40 publications

Study on Development Law of Mining‐Induced Slope Fracture in Gully Mining Area

Study on Development Law of Mining‐Induced Slope Fracture in Gully Mining Area

Study on In Situ Stress Distribution Law of the Deep Mine: Taking Linyi Mining Area as an Example

Experiments on Mechanical Response and Energy Dissipation Behavior of Rockburst‐Prone Coal Samples Under Impact Loading

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