A new seismic-based strain energy methodology for coal burst forecasting in underground coal mines

Cai, Wu; Li, Dou; Si, Guangyao; Cao, Anye; Gong, Siyuan; Yuan, Shuyun

doi:10.1016/j.ijrmms.2019.104086

Cited by 93 publications

(37 citation statements)

References 48 publications

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“…The concentration of high stresses results in failure in the surrounding rock and microseismic emissions during the rock failure process. 33,50,51 The relationship among (1) ∇ ⋅ = ü + cu − f, x, y, z ∈ Ω.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…displacement, stress, and seismicity during mining-induced failure has been extensively examined in recent years, as well as being widely used in the monitoring of major mine disasters, such as roof collapse, mine water inrush, coal and gas outburst, and rock burst. [51][52][53] Figure 3 illustrates a typical relationship between rock strata movement and microseismic activities. 54 This shows that microseismic events occur when the roof rock strata rupture, where different numbers of microseismic events reflect different degrees of rupture.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

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In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Nie

Zhu

et al. 2020

Energy Science & Engineering

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Coal remains a primary energy source for the foreseeable future. However, existing approaches for coal exploitation and utilization are highly detrimental to the geological formations from which they are extracted and the atmospheric environment. Moreover, underground mining can induce earthquakes that lead to fatalities and financial losses. The demand to abandon coal mining is increasing worldwide, and the need for efficient, safe, and environmentally acceptable coal exploitation and utilization has garnered widespread attention. We propose a novel unmanned automatic machine‐based mining and in situ conversion method for the safe and clean exploitation and utilization of subsurface coal resources. Solid coal is transformed in situ into fluidized energy resources using this method. To evaluate its effectiveness, a geological model of a coal mine was generated, and a numerical simulation based on the continuum‐based discrete element method was conducted to compare the mining‐induced stress distribution, roof subsidence, coal wall failure, and microseismicity for fluidized and traditional mining methods. Our results indicate that the proposed mining method can significantly reduce damage to the geological formation and greenhouse gas emissions associated with the exploitation and utilization of coal resources. We also discuss the limitations of the current study and future research possibilities.

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Section: Numerical Simulation Methodsmentioning

confidence: 99%

Section: Numerical Simulation Methodsmentioning

confidence: 99%

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Nie

Zhu

et al. 2020

Energy Science & Engineering

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“…Energy is the essential characteristic of physical reaction and the internal factor of substance failure through the whole deformation and failure process of coal rock. Therefore, the energy dissipation can be analyzed to clarify the crushing mechanism of coal rock [2][3][4][5][6][7]. However, compared with the total input energy, the effective energy for rock crushing is quite low in mining techniques such as percus-sion drilling, blasting, and cutting.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bedding Structure on the Energy Dissipation Characteristics of Dynamic Tensile Fracture for Water-Saturated Coal

et al. 2021

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The analysis of energy dissipation characteristics is a basic way to elucidate the mechanism of coal rock fragmentation. In order to study the energy dissipation patterns during dynamic tensile deformation damage of coal samples, the Brazilian disc (BD) splitting test under impact conditions was conducted on burst-prone coal samples using a split Hopkinson pressure bar (SHPB) loading system. The effects of impact velocity, bedding angle, and water saturated on the total absorbed energy density, total dissipated energy density, and damage variables of coal samples were investigated. In addition, the coal samples were collected after crushing to produce debris with particle sizes of 0-0.2 mm and 0.2-5 mm, and the distribution characteristics of different size debris were compared and analyzed. The results show that the damage variables of natural dry coal samples increase approximately linearly with the increase of impact velocity; however, the overall damage variables of saturated coal samples increase exponentially as a function of impact velocity. Compared with air-dry samples, the number of fragments with the particle size of 0-0.2 mm of saturated samples decreases by 14.1%-31.3%, and the number of fragments with the particle size of 0.2-5 mm decreases by 33.7%-53.0%. However, when the bedding angle is 45°, the percentage of fragment mass of saturated samples is larger than that of air-dry samples. The conclusions provide a theoretical basis for understanding the deterioration mechanism of coal after water saturation and the implementation of water injection dust prevention technology in coal mines.

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“…With the continuous increase of the depth and intensity of coal mining, coal burst has become one of the main disasters restricting the safe and efficient mining of coal mine. is problem seriously affects the economic development and social stability of China [1][2][3][4]. Coal burst is a dynamic phenomenon characterized by sudden, rapid, and violent destruction, produced by the instantaneous release of elastic deformation energy in the coal mass around the mine roadway or stope [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst‐Prone Coal

Gong

Wang

Zhou

et al. 2021

Shock and Vibration

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High in-situ stress and frequent dynamic disturbances caused by the mining process in deep coal mines can easily induce dynamic disasters such as coal burst. We conducted laboratory experiments to assess the effects of the axial stress loading and dynamic cyclic impact loading on the dynamic mechanical properties of burst-prone coals by using a modified split Hopkinson pressure bar (SHPB). Comparisons were made using two types of burst-prone and burst-resistant coal samples. The mineral components, organic macerals, and dynamic mechanical features of both burst-prone and burst-resistant coal samples were comparatively analyzed based on the obtained X-ray diffraction (XRD), optical microscope observations, and dynamic compressive stress-strain curves, respectively. The results of the microstructure analysis indicated a larger difference between the minimum and maximum reflectances of vitrinite for burst-prone coal. Compared to the burst-resistant coal samples, the burst-prone coals contained less corpocollinite and fusinite. While applying a high axial static load combined with cyclic impact load, the coal samples showed the characteristics of fatigue damage. The results also demonstrated that preaxial stress affected the burst resistance of coal samples. The greater the preaxial stress was, the less the coal samples could withstand the dynamic cyclic impact load. In comparison to the burst-resistant coal sample, the burst-prone coal sample showed a larger dynamic compressive strength and a lower deformation. They were also more positively capable of the propagation and activation of the coal burst. We believe that the results of the study are conducive to further understanding of the distribution of microcomponents of burst-prone coals. The results are also beneficial for realizing the dynamic mechanical characteristics of burst-prone coals under the impact of cyclic dynamic load.

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A new seismic-based strain energy methodology for coal burst forecasting in underground coal mines

Cited by 93 publications

References 48 publications

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Effect of Bedding Structure on the Energy Dissipation Characteristics of Dynamic Tensile Fracture for Water-Saturated Coal

Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst‐Prone Coal

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