Experimental investigations into acoustic emission in coal samples under uniaxial loading

Шкуратник, В. Л.; Filimonov, Yu. A.; Kuchurin, S. V.

doi:10.1007/s10913-005-0030-3

Cited by 53 publications

(27 citation statements)

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“…Sagar et al studied the acoustic emission of coal and rock under different loading [3][4][5][6]. Shkuratnik and Rudajev studied the characteristics of acoustic emission under uniaxial and triaxial compression [7][8][9]. Ma et al studied mechanical properties of coal and rock under uniaxial and triaxial compression [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study of Acoustic Emission and Mechanical Characteristics of Coal Samples under Different Loading Rates

Gao

et al. 2015

Shock and Vibration

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To study the effect of loading rate on mechanical properties and acoustic emission characteristics of coal samples, collected from Sanjiaohe Colliery, the uniaxial compression tests are carried out under various levels of loading rates, including 0.001 mm/s, 0.002 mm/s, and 0.005 mm/s, respectively, using AE-win E1.86 acoustic emission instrument and RMT-150C rock mechanics test system. The results indicate that the loading rate has a strong impact on peak stress and peak strain of coal samples, but the effect of loading rate on elasticity modulus of coal samples is relatively small. When the loading rate increases from 0.001 mm/s to 0.002 mm/s, the peak stress increases from 22.67 MPa to 24.99 MPa, the incremental percentage is 10.23%, and under the same condition the peak strain increases from 0.006191 to 0.007411 and the incremental percentage is 19.71%. Similarly, when the loading rate increases from 0.002 mm/s to 0.005 mm/s, the peak stress increases from 24.99 MPa to 28.01 MPa, the incremental percentage is 12.08%, the peak strain increases from 0.007411 to 0.008203, and the incremental percentage is 10.69%. The relationship between acoustic emission and loading rate presents a positive correlation, and the negative correlation relation has been determined between acoustic emission cumulative counts and loading rate during the rupture process of coal samples.

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Section: Introductionmentioning

confidence: 99%

Study of Acoustic Emission and Mechanical Characteristics of Coal Samples under Different Loading Rates

Gao

et al. 2015

Shock and Vibration

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“…A reasonably good correlation between fracture energy (Efracture) and acoustic-emission energy (Eacoustic) was found by Landis on mortar specimens [28]. Shkuratnik et al found that acoustic emission is positively related to the compression stress applied to a coal sample [34,35]. A uniaxial compression test of an Australian coal sample, conducted by Ranjith et al also led to the same conclusion as that of Shkuratnik [31].…”

Section: Energy Forms and The Energy Conservation Equationmentioning

confidence: 77%

Analysis of Energy Accumulation and Dissipation of Coal Bursts

et al. 2018

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Coal bursts are a serious dynamic hazard for underground coalmines, and they attract the extensive interest of studies from mining and geotechnical researchers worldwide. More recently, coal-burst incidents were reported in some Australian coalmines as a result of inadequate geological assessment of coal-burst hazards. The coal-burst process is closely associated with the accumulation of elastic energy and the rapid dissipation of kinetic energy. This paper introduces the essential geological conditions for energy accumulation, and the likely precursors for rapid energy dissipation leading to coal burst, which can be used by Australian coalmines to determine their coal-burst risk accordingly. Different energy forms and their transformations during the coal-burst process are introduced in detail in this paper. The dominant geological factors resulting in the accumulation of massive energy are analyzed, and the likely precursors associated with the instant release of elastic energy are discussed.Energies 2018, 11, 1816 2 of 10 diminish the damage of potential coal-burst accidents following the first recognized case of coal burst accident at a coalmine. However, the risk of coal burst is generally hard to recognize for coalmines with no history of coal burst. Particularly in Australian coalmines, coal-burst hazards are hard to recognize, as there is no pre-assessment process or real-time monitoring apparatus of coal-burst risk.Energy concepts associated with coal bursts are a hotspot of coal-burst research. Based on the mechanical behavior of coal subject to uniaxial compression stress, Bieniawsk et al. found that coal bursts only happen when a large amount of elastic energy is stored in the body of coal [15]. Many researchers carried out detailed research on the energy dissipation forms of coal bursts, and proposed various coal-burst monitoring and early-warning methods, such as electromagnetic radiation [16], acoustic emission [17], and microseismic techniques [18][19][20]. L.M. Dou believes that the key to mitigating coal bursts is a decrease in the elastic energy stored in the coal or surrounding rock of the mining area [21]. In other words, coal bursts only happen when massive elastic energy stored in the coal is instantaneously released. This paper aims to introduce the essential geological conditions for energy accumulation, and the likely precursors for rapid energy dissipation in coalmines, which can assist Australian coalmines in determining their coal-burst risk accordingly. To achieve this aim, various energy forms and energy balances featured during coal bursts are introduced in detail. Then, the dominant geological factors resulting in the accumulation of massive energy are analyzed. Furthermore, the likely precursors associated with the instant release of elastic energy are discussed.

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“…V.L. Shkuratnik [18,19] studied the acoustic emission change law of coal sample during the whole process of coal rock uniaxial and triaxial compression test, and got the corresponding relationship between coal sample strain and acoustic emission characteristics. Chengdong Su [20] conducted the triaxial compression test, and analyzed the strength and deformation characteristics of coal samples under different stress conditions.…”

Section: Introductionmentioning

confidence: 99%

The Model for Calculating Elastic Modulus and Poisson's Ratio of Coal Body

Ai¹,

2013

TOEFJ

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Coal body is a type of fractured rock mass in which lots of cleat fractures developed. Its mechanical properties vary with the parametric variation of coal rock block, face cleat and butt cleat. Based on the linear elastic theory and displacement equivalent principle and simplifying the face cleat and butt cleat as multi-bank penetrating and intermittent cracks, the model was established to calculate the elastic modulus and Poisson's ratio of coal body combined with cleat. By analyzing the model, it also obtained the influence of the parameter variation of coal rock block, face cleat and butt cleat on the elastic modulus and Poisson's ratio of the coal body. Study results showed that the connectivity rate of butt cleat and the distance between face cleats had a weak influence on elastic modulus of coal body. When the inclination of face cleat was 90°, the elastic modulus of coal body reached the maximal value and it equaled to the elastic modulus of coal rock block. When the inclination of face cleat was 0°, the elastic modulus of coal body was exclusively dependent on the elastic modulus of coal rock block, the normal stiffness of face cleat and the distance between them. When the distance between butt cleats or the connectivity rate of butt cleat was fixed, the Poisson's ratio of the coal body initially increased and then decreased with increasing of the face cleat inclination.

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Experimental investigations into acoustic emission in coal samples under uniaxial loading

Cited by 53 publications

References 0 publications

Study of Acoustic Emission and Mechanical Characteristics of Coal Samples under Different Loading Rates

Study of Acoustic Emission and Mechanical Characteristics of Coal Samples under Different Loading Rates

Analysis of Energy Accumulation and Dissipation of Coal Bursts

The Model for Calculating Elastic Modulus and Poisson's Ratio of Coal Body

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