Mechanism of multifield coupling-induced outburst in mining-disturbed coal seam

Zhao, Yang; Lin, Baiquan; Liu, Ting; Zheng, Yuannan; Kong, Jie; Li, Qingzhao; Song, Haoran

doi:10.1016/j.fuel.2020.117716

Cited by 38 publications

(36 citation statements)

References 34 publications

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“…Furthermore, when the energy of the gas power source is much greater than the energy consumed by the development and penetration of the cracks, the coal mass will collapse and breaks all of a sudden, which will form the coal and gas outburst accidents. Besides, Zhao et al [56] conducted a series of experiments and found that there are obvious multi-physical field coupling effects between temperature and gas pressure field. After the outburst occurs, a large amount of gas is discharged, which causing the medium gas pressure to reduce.…”

Section: Disaster-causing Mechanism Of Multi-field Couplingmentioning

confidence: 99%

Mechanism and Classification of Coal and Gas Outbursts in China

Zhang

Yang

et al. 2021

Advances in Civil Engineering

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Coal and gas outburst is a kind of complex dynamic disaster with short duration and strong explosiveness, and the modes and strength of the outburst are determined by the in situ stress, gas pressure, and physical and mechanical properties of the coal mass. In this paper, the status quo of research on the mechanism of coal and gas outburst in China is described from three aspects: the controlling effect of single factor, the controlling effect of multi-factor, and new understandings of the outburst mechanism in recent years. Firstly, controlling factors of coal and gas outburst are classified for an in-depth analysis of the main factors of the same type of disasters, and the research progress and new understandings of the mechanism of coal and gas outburst are systematically sorted out. Secondly, the influencing factors of the strength coal mass are analyzed, and the related issues of coal mass strength on coal and gas outburst disaster mechanism are discussed. The results show that the stages of incubation, occurrence, development, and stop on coal and gas outburst are affected by the coupling effects of in situ stress field, gas pressure field, and seepage field, and the coal strength becomes an important factor affecting outburst strength under the same in situ stress and gas pressure. Therefore, the scientific and reasonable improvement methods of such similar simulation experiment devices are proposed according to the existing experimental methods and devices, which is of great significance to provide ideas for the continuous transferring to deep mining and preventing coal and gas outburst in China in the future.

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Section: Disaster-causing Mechanism Of Multi-field Couplingmentioning

confidence: 99%

Mechanism and Classification of Coal and Gas Outbursts in China

Zhang

Yang

et al. 2021

Advances in Civil Engineering

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“…Coal and gas outbursts, referred to as "outbursts," are extremely complex and dynamic disasters that occur during underground coal mining, and seriously threaten the safety of mine-based production. [1][2][3][4] Nearly half of these outbursts have occurred in China, making it the country with the highest outburst risk worldwide. 2,5,6 Since 2021, twenty-two people have been killed in four coal and gas outburst accidents in China, all of which occurred in the process of coal roadway excavation.…”

Section: Introductionmentioning

confidence: 99%

“…Coal and gas outbursts, referred to as “outbursts,” are extremely complex and dynamic disasters that occur during underground coal mining, and seriously threaten the safety of mine‐based production 1–4 . Nearly half of these outbursts have occurred in China, making it the country with the highest outburst risk worldwide 2,5,6 .…”

Section: Introductionmentioning

confidence: 99%

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Zheng

Zhai

Jian-guo

et al. 2021

Fatigue Fract Eng Mat Struct

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The theoretical work, experiments, and practical application in the field are carried out to investigate the performance of strong–weak coupling structure. Results indicate that the deformation in the weak zone is greater than that in the strong zone before the peak stress. Moreover, the weak zone is crushed while the strong zone remains intact after the peak stress. Hence, the coupling structure could protect the strong zone from damage. Furthermore, the strong–weak coupling structure can effectively transfer the peak stress to the further area from coal roadway and improve the ability of the coal roadway surrounding rock to resist deformation. Finally, in the field tests, the strong–weak structure can significantly improve the stability of coal roadway. It shows that the average subsidence of the roadway roof and the accumulated deformation on the sides of the coal roadway in the strong–weak coupling zone were 55.21% and 61.42% lesser than those in the weak zone, respectively.

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“…Due to the complexity and the diversity of influencing factors, the simulation experiment is often difficult and the amount of data is relatively limited. On the basis of experimental research, it is a reliable research method to analyze the evolution law of stress and gas pressure field in outburst coal seam by constructing multiphysical field coupling model and using numerical simulation software [21][22][23][24], which can make up for the lack of physical simulation experiment. Therefore, this paper intends to establish a gas expansion energy model considering the coupling of coal seam stress and gas desorption and seepage and uses COMSOL numerical simulation software to solve it.…”

Section: Introductionmentioning

confidence: 99%

Gas Expansion Energy Model and Numerical Simulation of Outburst Coal Seam under Multifield Coupling

Cao¹,

Hu²,

Yong-liang³

et al. 2021

Geofluids

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Due to the insufficient understanding of the outburst mechanism, the coal and gas outburst disasters in China are more serious. Gas expansion energy is the main source of energy that causes outburst. In order to explore the distribution law of gas expansion energy in outburst coal seams, a gas-solid coupling equation of outburst coal seams was established. The distribution law of coal stress field, deformation field, gas flow field, and gas expansion energy were simulated and analyzed by using COMSOL Multiphysics. The results showed that from the excavation face to the deep part of coal seam, the stress presented unloading zone, stress concentration zone, and original stress zone. The volumetric strain and permeability reached the minimum, while the gas pressure reached the maximum at the peak value of vertical stress. As time goes on, the gas pressure in the fracture near the working face gradually decreased and was less than the pressure in coal matrix. The total gas expansion energy consists of free gas and desorption gas expansion energy. Affected by the excavation, free gas expansion energy maintained a constant value in the original coal seam and gradually decreased in the area close to the working face. The expansion energy provided by desorption gas was zero in the original coal seam. And it first increased and then decreased rapidly near the working face. Compared with stress and coal seam thickness, gas pressure and initial diffusion coefficient had significant influence on gas expansion energy of coal seam. When the diffusion coefficient was greater than 1e-9 m2/s, the gas expansion energy of the coal seam near the working face was significantly higher than that of the original coal seam, which had the risk of inducing outburst.

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Mechanism of multifield coupling-induced outburst in mining-disturbed coal seam

Cited by 38 publications

References 34 publications

Mechanism and Classification of Coal and Gas Outbursts in China

Mechanism and Classification of Coal and Gas Outbursts in China

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Gas Expansion Energy Model and Numerical Simulation of Outburst Coal Seam under Multifield Coupling

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