Occurrence, predication, and control of coal burst events in the U.S.

Iannacchione, Anthony T.; Tadolini, Stephen C.

doi:10.1016/j.ijmst.2015.11.008

Cited by 80 publications

(34 citation statements)

References 2 publications

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“…An increase in the severity and frequency of coal bursts with mining depth was found by researchers worldwide [1,7,41,42]. Mining depth can directly contribute to the increase in risk of coal bursts from two aspects.…”

Section: Mining Depthmentioning

confidence: 93%

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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Section: Mining Depthmentioning

confidence: 93%

Analysis of Energy Accumulation and Dissipation of Coal Bursts

et al. 2018

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“…According to the studies of dynamic failure in roadways of TCRWF under primary mining impact (PMI), it is found that the width of the excavation damage zone of surrounding rock under dynamic failure is larger than that of static pressure [5,6]. Roof thickness, strength, and distance from the coal seam are important factors to induce dynamic failure in roadways [7,8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Guo

Feng

et al. 2019

Advances in Civil Engineering

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Rock and coal dynamic failures have a higher chance to occur when thick and competent roof strata are presented, which can build up a high level of energy. This paper studied the fracturing characteristics of the competent roof strata during longwall face retreat and their effects on roadways’ stability to gain an improved understanding of the rock dynamic failure occurred in roadways as well as the associated ground controls. The results indicated that the main reason of dynamic failure in roadways was the structural change of lateral main roof over a chain pillar, which transformed from the cantilever beam in the period of primary mining impact (PMI) to the triangular arch in the period of secondary mining impact (SMI). Based on corresponding mechanical models developed for the lateral main roof over the chain pillar, it was calculated that the force on roadways’ roof in the period of SMI was 3.7 times larger than that in the period of PMI. Then, the dynamic failure control method of increasing the chain pillar width was proposed. The stress distribution and deformation of roadways with different chain pillar widths were simulated using FLAC3D. The results indicate that as the pillar width increases, the influence of secondary mining on roadways’ stability decreases, and a threshold of not less than 30 m pillar width was suggested. The outcomes of this study would provide guidance for the design of chain pillars where thick and competent roof strata are presented.

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“…During the rock burst, there is a huge release of elastic strain energy which can result in serious threats to the safety of coal mine production [1][2][3]. With the increase of the coal mining depth, the occurrence frequency of rock burst also increases in China [4][5][6][7][8][9][10]. Among the different kinds of rock burst, sloughing rock burst is the most common one, which usually results from the local instability of a mine roadway [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

Chen

Mao

et al. 2017

Shock and Vibration

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The instability of layer-crack plate structure in coal wall is one of the causes of rock burst. In the present paper, we investigate the formation and instability processes of layer-crack plate structure in coal wall by experiments and theoretical analysis. The results reveal that layer-crack plate structure formed near the free surface of the coal wall during the loading. During the formation of the layer-crack plate structure, the lateral displacement curve of the coal wall experiences a jagged variation, which suggests the nonlinear instability failure of the coal wall with a sudden release of the elastic energy. Then, a dynamic model for the stability analysis of the layer-crack plate structure was proposed, which takes consideration of the dynamic disturbance factor. Based on the dynamic model, the criterion for dynamic instability of the layer-crack plate structure was determined and demonstrated by an example. According to the analytical results, some control methods of dynamic stability of the layer-crack plate structure was put forward.

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Occurrence, predication, and control of coal burst events in the U.S.

Cited by 80 publications

References 2 publications

Analysis of Energy Accumulation and Dissipation of Coal Bursts

Analysis of Energy Accumulation and Dissipation of Coal Bursts

Mechanism of Dynamic Failure in Roadways with Thick and Competent Roof Strata: A Case Study

Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

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