Dynamic Characterisation of Gneiss

Mishra, SK; Khetwal, Anuradha; Chakraborty, Tanusree

doi:10.1007/s00603-018-1594-y

Cited by 27 publications

(15 citation statements)

References 41 publications

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“…It is found that the higher the temperature is, the more microscopic pores are, and the lower the P-wave velocity is. Mishra [10] explored the dynamic mechanical properties of gneiss and found that the peak strength of gneiss was related to strain rate, but dynamic modulus were not related to strain rate. Vettegren [11] explores the microscopic material composition on the failure surface of gneiss after shear failure, and studies the influence of mineral particles on rock failure.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Properties of Gneiss under Different Ground Stresses

Wang

Deng

et al. 2022

Sensors

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Initial geostress has great influence on the properties of gneiss. The physical and mechanical properties of gneiss vary considerably due to different initial geostresses, which exert a huge effect on the stability of underground engineering. In order to explore the influence of initial ground stress on the properties of gneiss. Changes in the physical properties (e.g., P-wave velocity and volumetric weight), mechanical properties (e.g., compressive strength, elastic modulus, and residual strength) and failure mode of gneiss are analyzed by conducting physical and mechanical tests on gneiss in different ground stress areas. The results show that high geostress can improve the pre-peak mechanical properties of gneiss, and weaken its post-peak mechanical properties. When the initial geostress is greater, the pre-peak mechanical properties are better, and the post-peak mechanical properties are worse. The failure mode of gneiss under high ground stress is primarily brittle failure. When the initial ground stress is greater, brittleness is stronger. According to the research results of this paper, it can provide the basis for the optimization and improvement of underground engineering support in gneiss strata with high geostress. The research results have important reference value and guiding significance for underground engineering construction in high geostress gneiss areas.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Properties of Gneiss under Different Ground Stresses

Wang

Deng

et al. 2022

Sensors

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“…However, in the actual production activities of coal mining operations, the influence of dynamic factors such as mechanical shock, and rock fracture on coal destruction is more complicated [24] . Daryadel, ZHU, Mishra and Doner et al [25][26][27][28] analyzed the dynamic mechanical properties of the Split Hopkinson Pressure Bar (SHPB) [29] on concrete specimens. AI et al [30] studied the crack propagation and dynamic mechanical properties of coal, and found that the direction of the bedding has a great influence on its dynamic compressive strength, strain rate and strain energy.…”

Section: Introductionmentioning

confidence: 99%

Research On Water-Immersion Softening Mechanism of Coal Rock Mass Based on Split Hopkinson Pressure Bar Experiment

Liu

Wang

et al. 2021

Preprint

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The coal mining process is affected by multiple sources of water such as groundwater and coal seam water injection. Understanding the dynamic mechanical parameters of water-immersed coal is helpful to the safe production of coal mines. The impact compression tests were performed on coal with different moisture contents by using the ϕ50 mm Split Hopkinson Pressure Bar (SHPB) experimental system, and the dynamic characteristics and energy loss laws of water-immersed coal with different compositions and water contents were analyzed. Through analysis and discussion, it is found that: (1) When the moisture content of the coal sample is 0%, 30%, 60%, the stress, strain rate and energy first increase and then decrease with time; (2) When the moisture content of the coal sample increases from 30% to 60%, the stress "plateau" of the coal sample disappears, resulting in an increase in the interval of the compressive stress and a decrease in the interval of the expansion stress. (3) The increase of the moisture content of the coal sample will affect its impact deformation and failure mode. When the moisture content is 60%, the incident rod end and the transmission rod end of the coal sample will have obvious compression failure, and the middle part of the coal sample will also experience expansion and deformation. (4) The coal composition ratio suitable for the impact experiment of coal immersion softening is optimized.

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“…Coal and rock masses are mainly compressed and sheared under static loading [9][10][11][12][13][14]. e split-Hopkinson pressure bar (SHPB) is the main experimental device that is used to explore the mechanism of coal mass dynamic damage [15][16][17]. Feng et al [18] conducted dynamic loading tests on coal using an SHPB system, and the mechanism of energy dissipation was discussed based on the fracture processes of coal under dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Response Characteristics of Cylindrical Coal-Rock Samples under Dynamic Loads

Zhu

Fang

Zhang

et al. 2020

Shock and Vibration

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To research the dynamic response characteristics of cylindrical coal-rock samples under impact loads, the impact of rigid bars on cylindrical coal-rock samples is simulated under different speed conditions, based on LS-DYNA software, and the dynamic distribution characteristics of the stress, strain, and energy of cylindrical coal-rock samples are analyzed. The results demonstrated the following: (1) the cylindrical coal-rock sample failed at the center first, and the damage developed downward along the axial direction. (2) The critical effective stress and strain have an exponential function relationship with the velocity, and the critical time has a linear relationship with the velocity. (3) The energy change law of the cylindrical coal-rock sample is consistent with the destruction morphology. (4) The axial stress peaks in the severe damage part have a linear relationship with the speed, the axial stress attenuates rapidly after passing the stress yield point, and the axial strain does not increase continuously. (5) The peaks stress and strain on the central axis and the radial line obey the power function distribution, the axial stress produces tensile stress in the axial propagation direction, and the axial stress and strain peaks at the same position are larger than those of the radial stress and strain peaks. This research provides a reference for studying coal and rock dynamic disasters.

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Dynamic Characterisation of Gneiss

Cited by 27 publications

References 41 publications

Investigation on the Properties of Gneiss under Different Ground Stresses

Investigation on the Properties of Gneiss under Different Ground Stresses

Research On Water-Immersion Softening Mechanism of Coal Rock Mass Based on Split Hopkinson Pressure Bar Experiment

Study on the Dynamic Response Characteristics of Cylindrical Coal-Rock Samples under Dynamic Loads

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