Investigation on the Linear Energy Storage and Dissipation Laws of Rock Materials Under Uniaxial Compression

Gong, Fengqiang; Yan, Jingyi; Luo, Song; Li, Xibing

doi:10.1007/s00603-019-01842-4

Cited by 189 publications

(73 citation statements)

References 34 publications

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“…From Figure 13 and Equations (17) and 18 From Figure 14, it also can be found that the index of p e K increases from 1.3978 to 2.0892 when the index of p et W increases from 3.509 to 3.578 with a correlation coefficient of 0.8466, which means From Figure 13 and Equations (17) and (18), it is clear that both the indexes K p e and W p et increase linearly with increasing UCS, which agrees well with the results of Gong et al [37]. The difference is that the slopes for indexes of K has a very tiny fluctuation for different specimens and it is approximate constant for a same coal type.…”

Section: Relationship Between Different Parameterssupporting

confidence: 88%

“…Because of the dispersion and heterogeneity of the coal specimen strength [36], it is impossible to conduct the unloading test on coal specimens at the peak strength point. Gong et al [37] proposed a new method to calculate the peak elastic strain energy storage index for different rock specimens, such as sandstone, granite, and marble. In this study, this method was introduced and validated to obtain elastic strain density at the peak point for coal specimens.…”

Section: Definition Of the Modified Indexmentioning

confidence: 99%

“…The data is listed in Table 4. In addition, the peak-strength strain energy storage index p et W , which was proposed by Gong et al [37], has also been calculated by the following equation:…”

Section: Pj Coal Minementioning

confidence: 99%

“…The data is listed in Table 4. In addition, the peak-strength strain energy storage index W p et , which was proposed by Gong et al [37], has also been calculated by the following equation: According to the above laboratory tests results [31,40], one can conclude that no injected coal fragments with almost intact sample indicates no burst proneness, a minor ejected fragment with slight ejection sound and some macroscopic cracks means low burst proneness, and a large amount of ejected fragments with loud sound and severely broken sample indicates high proneness. Figure 9 shows the ultimate failure mode of coal specimens under uniaxial compression test.…”

Section: Pj Coal Minementioning

confidence: 99%

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A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Liu

et al. 2020

Energies

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Coal burst is a type of dynamic geological hazard in coal mine. In this study, a modified bursting energy index, which is defined as the ratio of elastic strain energy at the peak strength to the released strain energy density at the post-peak stage, was proposed to evaluate the coal burst proneness. The calculation method for this index was also introduced. Two coal mines (PJ and TJH coal mines) located in Ordos coalfield were used to verify the validity of the proposed method. The tests results indicate that modified bursting energy index increases linearly with increasing uniaxial compressive strength. The parameter A, which is used to fit relation between total input and elastic strain energy density, has a significant effect on the modified bursting energy index. A large value of parameter A means more elastic strain energy before the peak strength while a small value indicates most of input energy was dissipated. Finally, the coal burst proneness of these two coal mines was evaluated with the modified index. The results of modified index are consistent with that of laboratory tests, and more reasonable than that from original bursting energy index because it removed the dissipated strain energy from the total input strain energy density.

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Section: Relationship Between Different Parameterssupporting

confidence: 88%

Section: Definition Of the Modified Indexmentioning

confidence: 99%

Section: Pj Coal Minementioning

confidence: 99%

Section: Pj Coal Minementioning

confidence: 99%

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A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Liu

et al. 2020

Energies

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“…In fact, the absorption and transformation of energy is the essential cause of rock material failure. [15][16][17][18]. Especially in the dynamic test, the incident energy carried by the incident wave provides the energy source for the failure of rock specimens.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Gong

2020

Advances in Civil Engineering

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In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. The states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. The results show that the ruptured state of the specimen corresponds to the critical failure strain. Taking the critical incident energy as a turning point, two positive linear fitting relations between the dissipated energy and incident energy before and after the point are obtained, and the dynamic linear dissipation law is found. When the incident energy is less than the critical energy, specimens were unruptured after impact. When the incident energy is greater than the critical energy, specimens will be broken after impact. According to the obtained linear energy dissipation law, the dynamic tensile energy dissipation coefficient (DTEDC) was introduced for quantitatively describing the dynamic energy dissipation capacity of rock materials in the dynamic Brazilian disc test. When the specimen is in the unruptured state, the ideal DTEDC is a constant value. When the specimen is in a broken state, the DTEDC increases with the increase of incident energy.

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Characteristics of energy storage and dissipation of coal under one‐time cyclic load

Peng

Shi

Zou

et al. 2020

Energy Science & Engineering

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Energy is an important research parameter in rock mechanics. To explore the law of energy evolution of coal, a one‐time loading and unloading test under uniaxial compression was conducted on coal taken from four different coal mines. By utilizing the area integral method, the total input, elastic, and dissipated energy densities in coal at different unloading levels were calculated. The correlation between various energy densities and the evolution law of energy density with different unloading levels was attained. The peak strengths of the coal slowly declined with an increasing unloading level, which conforms to the relation of a linearly decreasing function. The energy dissipation rate has nonlinear characteristics, and the shape of the dissipation rate fitting curve changed from an upper concave to a downward concave with increasing strength. In all the coal samples, the energy density grew nonlinearly with the unloading level. Moreover, the growth rate of the total energy density was the highest, followed by the growth rates of the elastic and dissipated energy densities. All ratios of the elastic and dissipated energy densities to the total input energy density and the ratio of the dissipated energy density to the elastic energy density were constant. As the strength increased, the input energy and the elastic energy density increased at a faster rate, and they observed the same law. There is an insignificant relationship between the degree of destruction of the coal and the level of unloading. Energy is a major factor that drives the failure of a test piece, but this is not the main factor that determines the degree of damage to the test piece.

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Investigation on the Linear Energy Storage and Dissipation Laws of Rock Materials Under Uniaxial Compression

Cited by 189 publications

References 34 publications

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Characteristics of energy storage and dissipation of coal under one‐time cyclic load

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