Research progress of disaster factors and a prevention alarm index of coal and gas outbursts

Wang, Fakai; Pan, Zhejun; Cui, Bo; Sun, Zhongguang; Zhang, Kaizhi

doi:10.1007/s12517-021-07540-2

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…In recent years, with the deepening of mining depth and the increasing complexity of coal mining, the deep coal seams have generally exhibited high ground stress, high gas content, and high gas pressure characteristics. Gas disasters have become one of the factors seriously affecting mine safety production. , Gas pressure is an important indicator for preventing gas disasters, which directly reflects the gas content in coal seams and the potential danger level of coal and gas outbursts. − However, accurate measurement of coal seam gas pressure is very difficult under complex production conditions. , According to the long-term experience in coal seam gas pressure measurement, the success rate can reach as high as 70% . Low success rate and inaccuracy of measurement will increase the danger in production, which limits the production speed of the mine.…”

Section: Introductionmentioning

confidence: 99%

“…Gas disasters have become one of the factors seriously affecting mine safety production. 2 , 3 Gas pressure is an important indicator for preventing gas disasters, which directly reflects the gas content in coal seams and the potential danger level of coal and gas outbursts. 4 − 6 However, accurate measurement of coal seam gas pressure is very difficult under complex production conditions.…”

Section: Introductionmentioning

confidence: 99%

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Study of Reasonable Grouting Pressure in the Process of Measuring Coal Seam Gas Pressure and Application

Yang

Zhang

2023

ACS Omega

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Coal seam gas pressure is an important index to evaluate the risk of coal outbursts. The accuracy of measurement is closely related to the quality of hole sealing, and reasonable grouting pressure is one of the key factors to determine the quality of hole sealing. To obtain a reasonable grouting pressure, a mathematical model for slurry flow was established based on the relationship between the seepage law of the slurry and the properties of the borehole surrounding a rock. According to the conditions of the working face 11111 of the coal seam Ji15–17 in Pingdingshan No. 13 Coal Mine, the reasonable grouting pressure in the process of hole sealing and pressure measurement were simulated by COMSOL multiphysics numerical simulation software. After comparing the pressure distribution and slurry diffusion characteristics in the borehole under different grouting pressures, it is concluded that the reasonable grouting pressure is 4 MPa. When 4 MPa grouting pressure to seal the hole is used during actual engineering verification, the measured gas pressure is 2.7 MPa, which is more accurate than the result obtained under conditions of sealing with normal pressure grouting.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Reasonable Grouting Pressure in the Process of Measuring Coal Seam Gas Pressure and Application

Yang

Zhang

2023

ACS Omega

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“…According to statistics, a total of 490 coal and gas outburst accidents occurred in China from 2001 to 2021, resulting in 3219 deaths [3,4]. Coal and gas outbursts are a very harmful dynamic disaster phenomenon in coal mines [5][6][7]. Specifically, a large amount of coal-gas two-phase flow is suddenly emitted into the mining space, such as Sustainability 2023, 15, 12940 2 of 13 roadways and mining faces, in a very short period of time [8,9], which seriously threatens the safety of mine production.…”

Section: Introductionmentioning

confidence: 99%

Acoustic-Gas Coupling Response Law in the Whole Process of Coal and Gas Outburst

Zhang,

Zeng,

et al. 2023

Sustainability

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The intensification of the global energy crisis has led to an increasing demand for coal. China is a major coal-producing country in the world and also the country with the most severe coal and gas outburst disasters. Thus, the coal and gas outburst experiment was conducted, and the following results were obtained: the whole outburst process was divided into three stages, namely the outburst preparation stage, the outburst gestation stage, and the outburst development stage. The gas pressure and acoustic emission signals show significant changes in all three stages, while the variation patterns are different. The gas pressure changes were strongest and the acoustic emission signals were highest during the development stage. Therefore, the outburst development stage was further subdivided into four phases, and the correlation between acoustic emission and gas pressure in each phase was analyzed in detail. Furthermore, the acoustic emission signals in three stages were compared and analyzed. The peak values of acoustic emission count and energy reached 285 times·s−1 and 245 V in the preparation stage and reached 265 times·s−1 and 231 V in the gestation stage, respectively, only 1.66%~1.78% and 2.19%~2.32% of the development stage, namely 15,980 times·s−1 and 10,566 V. Moreover, it was found that the cumulative count and cumulative energy showed a parabolic relationship with the development time of the outburst. Based on the above experimental results, during the production process in coal mines, the dangerous state of outbursts can be monitored through gas pressure changes in the outburst preparation stage and gestation stage. Once in the development stage, more sensitive signals of acoustic emission and their fitting results are used for outburst hazard monitoring and early warning. Monitoring and warning of outbursts of combined gas pressure and acoustic emission signals can effectively improve the safety level of coal mine production.

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“…Gas dynamic disasters with noteworthy burstiness, destructiveness, and complexity often cause huge casualties and property losses (Yu et al, 2013;Wang et al, 2021), and its most important and fundamental technical means of prevention and control is gas drainage (Li, 2015;Zhou et al, 2016;Nikitenko and Glukhikh, 2021). However, coal seams with the risk of gas-dynamic disasters are always not only with high gas content but of poor permeability, resulting in a small drainage radius and poor drainage effect, which requires permeability enhancement to strengthen gas drainage (Lei et al, 2016;Cheng and Pan, 2020;Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

A New Blasting Permeability Enhancement Scheme For Deep-Buried Soft Coal Mining Face Based on Borehole Deformation Characteristics

et al. 2022

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When blasting to enhance permeability in deep-buried soft coal mining face with a hard roof whose gas drainage requirement is higher, the charging hole and control hole (which doubles as drainage hole) are easy to be deformed and damaged, seriously affecting the blasting implementation and effect. Combining with the stratum characteristics of soft coal seam and hard surrounding rock, the idea of arranging boreholes near the surrounding rock to reduce deformation, inspired by the end effect, is put forward. Then, the experimental research on the deformation characteristics of boreholes at different distances from the surrounding rock is carried out, and the results show that the closer the borehole is to the roof (floor), the smaller the deformation, under the same stress conditions and within a certain distance. Based on this, a new scheme of arranging control holes and blasting holes near the roof and floor is proposed and designed. The field test results show that the blasting of 60 m deep holes are successfully realized and the remarkable permeability enhancement effect is achieved, verifying the feasibility and effectiveness of the improved scheme. This study explores a new blasting permeability enhancement scheme with practical value and reference significance for deep-buried soft coal mining face with a hard roof.

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Research progress of disaster factors and a prevention alarm index of coal and gas outbursts

Cited by 8 publications

References 29 publications

Study of Reasonable Grouting Pressure in the Process of Measuring Coal Seam Gas Pressure and Application

Study of Reasonable Grouting Pressure in the Process of Measuring Coal Seam Gas Pressure and Application

Acoustic-Gas Coupling Response Law in the Whole Process of Coal and Gas Outburst

A New Blasting Permeability Enhancement Scheme For Deep-Buried Soft Coal Mining Face Based on Borehole Deformation Characteristics

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