Effects of thermal treatment on physical and mechanical characteristics of coal rock

Yin, Tubing; Wang, Pin; Li, Xibing; Shu, Ronghua; Ye, Zhouyuan

doi:10.1007/s11771-016-3292-9

Cited by 28 publications

(11 citation statements)

References 10 publications

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“…According to the one-dimensional stress wave propagation assumption, the three-wave method equation processed with the SHPB test technical data can be obtained using the following equation [26]:…”

Section: Test Equipment and Methodmentioning

confidence: 99%

“…sample; ε is the strain of the sample; σ is the stress of the sample; A S and A 0 denote the cross section area of the pressure bar and the sample, respectively; and E 0 is the elastic modulus of the bar. According to the stress uniformity assumption, the stress is equal everywhere in the sample, and equation the following equation can be obtained [26]:…”

Section: Test Equipment and Methodmentioning

confidence: 99%

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Impact of Moisture Content on the Dynamic Failure Energy Dissipation Characteristics of Sandstone

et al. 2019

Shock and Vibration

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Rockburst frequently occurs in deep underground engineering, which poses a threat to safety and causes economic losses. Water injection into surrounding rock masses is an effective method for preventing rockburst, and the moisture content of rocks is significant for assessing the probability of rockburst. However, the majority of studies focus on the relationship between the macromechanical properties of rock masses under static loads and the moisture content of rock masses and seldom explore the impact of moisture variation (under dynamic loads) on the mechanical properties and energy dissipation. In this paper, the mechanical properties and energy dissipation of sandstone with different moisture contents have been experimentally investigated by the split Hopkinson pressure bar (SHPB) test. The test results indicate that the peak strength, dynamic elastic modulus, and unloading elastic modulus of sandstone in dry conditions are considerably larger than those in moisture conditions, and the three parameters linearly decrease as the moisture content increases from 0% to 2.58%. The distribution law of sandstone fragments with different moisture contents has been investigated by sieving test fragments with different grain sizes of grading sieves. The results show that the percentage of large grain size fragments incrementally decreases, and the percentage of small grain size fragments incrementally increases with moisture contents from 0% to 2.58%. When the moisture content ranges from 2.01%∼2.58%, the fractal dimension linearly increases, which indicates that the higher the moisture content is, the larger the dimension of the broken sandstone is. The calculation results for energy indicate that the sandstone energy attains the peak value with 0% moisture content. When the moisture content ranges from 2.01%∼2.58%, the reflected energy increases, and the transmitted energy and dissipated energy linearly decrease. In addition, the surface energy of the sandstone with different moisture contents has been investigated by converting fragments into spheres with the corresponding size. The results indicate that the smallest surface area of sandstone is obtained in dry conditions, but its surface energy in dry conditions is larger than that in moisture conditions. When the moisture ranges from 0% to 2.58%, due to 3% illite and 2% chlorite clay minerals reacting with different proportions of moisture, the surface areas of sandstone fragments linearly increase and the surface energy of sandstone linearly decreases.

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Section: Test Equipment and Methodmentioning

confidence: 99%

Section: Test Equipment and Methodmentioning

confidence: 99%

Impact of Moisture Content on the Dynamic Failure Energy Dissipation Characteristics of Sandstone

et al. 2019

Shock and Vibration

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“…With gradual depletion of coal resources and gradual reduction of coal reserves at shallow depths, the mining of coal is subsequently moving deeper underground. Compressive mechanical properties of coal rocks are closely related to safe production of coal mines, and the study of the compressive mechanical properties of deeper coal rocks remains a priority (Wang et The studies on the mechanical behavior of coal rocks have been extensively reported (Yin et al, 2016;Chen et al, 2019;Zhong et al, 2022). Yin et al (2016) studied physical and mechanical properties of coal rock after treatment at different temperatures under impact loading.…”

Section: Introductionmentioning

confidence: 99%

Study of triaxial compression mechanical properties and pore-fracture characteristics of coal rocks in the Yili Basin, Xinjiang

Cheng¹,

Yue²,

Liu³

2023

Journal of Theoretical and Applied Mechanics

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Compressive mechanical properties and pore-fissure characteristics of coal rock specimens from three stably developed coal seams M 1 , M 8 and M 12 in the Xinjiang Yili Basin were investigated in detail by a series of tests. The results show that the compressive mechanical properties of coal rocks in the Yili Basin are significantly affected by the confining pressure. The peak axial stress increases and the peak modulus of elasticity decreases as the confining pressure increases. The peak axial strain increases and then remains constant, while the peak circumferential strain and peak volumetric strain increase and then decrease. The confining pressure has almost no effect on Poisson's ratio of the coal rock specimens. In addition, electron microscopy tests show that the microscopic fraction of the coal rock specimens is predominantly vitrinite, accounting for 83.1%-89.2%, while the percentage of the inertinite group is relatively small, at 10.3%-16.1%. The throat radius of the coal rock is mainly concentrated around 1-2 µm, while the pore radius of the coal rock is between 150-200 µm.The coal rock has an overall fine throat and low permeability, and the coal rock in the Yili Basin of Xinjiang is a typical low-permeability coal rock.

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“…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. Yin et al [19] performed dynamic compression experiments on coal-rock using SHPBs and found that the peak strain decreased when the peak stress increased. Based on the SHPB experiment and RMT-150C test systems, Wang et al [20] reported that the dynamic strength of 7D saturated coal specimens is lower than that of natural coal specimens under one-dimensional static-dynamic loading.…”

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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Effects of thermal treatment on physical and mechanical characteristics of coal rock

Cited by 28 publications

References 10 publications

Impact of Moisture Content on the Dynamic Failure Energy Dissipation Characteristics of Sandstone

Impact of Moisture Content on the Dynamic Failure Energy Dissipation Characteristics of Sandstone

Study of triaxial compression mechanical properties and pore-fracture characteristics of coal rocks in the Yili Basin, Xinjiang

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

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