Investigation on the potential hazard zone of gas explosion in the goaf under longwall top caving coal mining condition

Zhu, Pengfei; Li, Qingzhao; Li, Xiaowen; Zhang, Guiyun; Zhang, Yachao; Zheng, Yuannan

doi:10.1080/00102202.2022.2027393

Cited by 9 publications

(7 citation statements)

References 36 publications

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“…Comparing with some other literature studies 6,18,19 on the wind flow and gas transportation, the form of ventilation and the amount of ventilation changed, but they all present large air leakage at large porosity, large air flow inside the gob near the working face, and small air flow away from the working face; the overall wind flow distribution is similar. Comparing with the gas distribution law in the gob, they all show that the gas concentration on the leakage side is lower than the gas concentration on the return side, and the gas concentration in the shallow part of the gob is smaller than the gas concentration in the deep part of the gob, and the gas distribution law in the gob is similar, which provides strong evidence for the accuracy of the research study on the gas outflow characteristics in the upper corner of this paper.…”

Section: Discussionmentioning

confidence: 65%

“…The gas over limit in the upper corner of the gob is caused by the air leakage from the working face carrying out the gas in the gob, so the study of the air leakage from the working face and the gas distribution in the gob is necessary to prevent the gas over limit in the upper corner. Chen et al , analyzed the wind flow transport characteristics by numerical simulations and similar simulation experiments, and the study showed that the larger the amount of wind leakage into the gob, the greater the explosion potential of the gob. Therefore, the air leakage area of the working face and the contact surface of the gob is divided, and the air leakage area is protected against wind leakage to effectively prevent the occurrence of spontaneous combustion of coal left in the gob.…”

Section: Introductionmentioning

confidence: 99%

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Gas Emergence Characteristics of the Upper Corner on the 215101 Mining Working Face of the Yue Nan Coal Mine

et al. 2022

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To prevent the gas over limit in the upper corner of the 215101 working face of the Yue Nan coal mine, a numerical simulation method was used to analyze the gas concentration in the upper corner of the working face at different air intake volumes and mining velocities. The research results show that the gas concentration in the upper corner is 0.78, 0.52, 0.39, and 0.32% when the wind speed of the intake airflow roadway is 1, 1.5, 2, and 2.5 m/s, respectively, and an optimal wind speed of the intake airflow roadway is selected as 2 m/s. When the wind speed of the intake airflow roadway is 2 m/s, the working face mining velocity is 1, 2, 3, and 4 m/d, and the gas concentration in the upper corner is 0.27, 0.39, 0.58, and 0.83%, respectively, and an optimal working face mining velocity of 3 m/d is selected. Under the optimal mining conditions, the working face wind leakage area is divided, with 0∼30 m of the working face as the main leakage area and 150–180 m as the wind flow compensation area. According to the wind speed in the gob, the wind flow disturbance area is divided, the gob 0–50 m is the wind flow intense disturbance area, which is the main area of the upper corner gas source; the gob 50–62 m is the wind flow medium disturbance area, which is the secondary area of the upper corner gas source; the gob 62–75 m is the slight disturbance area, which has less influence on the upper corner gas concentration; the gob after 75 m is the wind flow undisturbed area, and the upper corner gas concentration is almost unaffected by it.

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Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Gas Emergence Characteristics of the Upper Corner on the 215101 Mining Working Face of the Yue Nan Coal Mine

et al. 2022

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“…What’s worse, as coal pillars are generally close to the sealed goaf, their spontaneous combustion is likely to induce gas explosions near the goaf, expanding the scope of disasters. This phenomenon is particularly common in mines featuring a high gas content. − …”

Section: Introductionmentioning

confidence: 99%

Research on the Law of Coal Pillar Spontaneous Combustion and Fire Prevention and Control Technology

Liu,

Qi,

Luo

et al. 2024

ACS Omega

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In coal pillar fires, the fire source is hard to be detected and the adjacent goaf is extremely likely to be affected. Such fires would give rise to thermal and dynamic disasters in mines, further causing casualties and environmental disruption. In this study, with the coal pillar spontaneous combustion (CPSC) accident in Chahasu Coal Mine taken as the research object, the oxygen uptake and limit of oxygen concentration of CPSC were explored. Based on the research results, a similar model was constructed, where a control group was used to simulate the hazardous area of CPSC in a bid to investigate the law of CPSC. Moreover, the polymer colloid perfusion system was constructed and the drilling parameters and perfusion process parameters were determined, and practices concerning spontaneous fire control were carried out. Here are the conclusions: First, air leakage in the coal pillar may lead to coal spontaneous combustion due to the impact of rib spalling, threatening 2−6 m above the middle of the coal pillar at a shallow position. Second, coal pillar grouting, injecting polymer colloids for cooling, and coal pillar cement reinforcement prove to be effective ways to prevent CPSC fires and combat recombustion.

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“…Reducing the ground stacking of coal gangue puts forward new requirements for the storage of coal gangue. Longterm theoretical research and practice have proved that using underground lling technology to treat coal gangue is the most reliable, thorough, and green disposal method with the lowest supervision cost at present, which not only solves the problem of coal gangue accumulation but also reduces and alleviates the surface settlement to a certain extent [9,10]. It can also inhibit the combustion of gob.…”

Section: Introductionmentioning

confidence: 99%

Simulation test study on filling flow law of gangue slurry in goaf

Liang,

Zhao,

Shi

et al. 2023

Preprint

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The disposal and utilization of solid waste of coal gangue is one of the main problems in coal mining in China. Injecting coal gangue into goaf in the form of slurry can effectively solve the problems of ground stacking and environmental pollution prevention. In order to obtain the flow law of gangue slurry in the void of the accumulated rock in the goaf, a visualization simulation test device for gangue slurry permeation grouting in the goaf was independently designed. The flow and diffusion characteristics, flow and diffusion velocity changes, void pressure changes, and viscosity changes of three mass concentrations (76%, 78%, 80%) of gangue slurry in the void between caved rock blocks in goaf were studied by visual grouting simulation test. The results show that: (1) The seepage process of gangue slurry in the goaf simulation test is divided into three diffusion forms, namely radial diffusion, axial diffusion, and bidirectional diffusion. The three diffusion forms are interrelated and inseparable. (2) The initial flow velocity of the slurry with different concentrations is different under the same permeation grouting pressure, and the higher the slurry concentration, the smaller the initial flow velocity of the slurry. The velocity of the slurry has a nonlinear relationship with the diffusion distance of the slurry. (3) With the permeation and diffusion of slurry, pressure sensors at different positions are subjected to pressure from bottom to top and enter the pressure boost stage, gradually forming stress peaks. When the slurry exceeds the position of the pressure sensor, the pressure on the pressure sensor is weakened and begins to enter the pressure relief stage, and the stress decline trend gradually becomes gentle with time. (4) The water loss effect occurs during slurry flow interaction with rock mass, resulting in slurry viscosity increasing. The viscosity of the slurry affects the difference in the amount of viscosity change. The research results can provide a certain theoretical basis for the goaf gangue slurry filling project.

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Investigation on the potential hazard zone of gas explosion in the goaf under longwall top caving coal mining condition

Cited by 9 publications

References 36 publications

Gas Emergence Characteristics of the Upper Corner on the 215101 Mining Working Face of the Yue Nan Coal Mine

Gas Emergence Characteristics of the Upper Corner on the 215101 Mining Working Face of the Yue Nan Coal Mine

Research on the Law of Coal Pillar Spontaneous Combustion and Fire Prevention and Control Technology

Simulation test study on filling flow law of gangue slurry in goaf

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