Dynamic evolution of negative pressure impact of cross-cut on oxygen concentration field in coal mine Goaf
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ORIGINAL
Dynamic evolution of negative pressure impact of cross-cut on oxygen concentration field in coal mine Goaf Liangzhou Chen 1 & Jian Yang 2 & Pengxiang Ding 1 Received: 14 December 2019 / Accepted: 13 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract For further understanding the coal spontaneous combustion in goaf, the dynamic evolution of the oxygen concentration field influenced by the condition of negative pressure of cross-cut were analyzed. Based on the on-site testing results, the range of the oxidation zone on the headentry and tailentry side is determined as 30 ~ 75 m and 15 ~ 65 m respectively. This paper adopts a new method called “fixed grid, dynamic attribute” to dynamically describe the spatial change of goaf caused by working face advancing. The validated model which developed by field measured data is used to study the dynamic evolution of negative pressure impact of cross-cut on oxygen concentration field in goaf. The results demonstrate that when the cross-cut is located at different positions of three zones of coal spontaneous combustion, the negative pressure of the cross-cut has different impact rules on the distribution of oxygen concentration field. The results are hopeful for providing effective guidance for coal mine fire prevention in goaf.
1 Introduction Coal is one of the most important energy in China [1]. In the process of coal mining, thermodynamic disasters such as gas explosion and coal spontaneous combustion seriously threaten the safe mining [2, 3]. For the coal seam with high gas emission and easy to spontaneous combustion, the increase of mining intensity leads to the rise of the gas emission from working face during the forward of working face [4]. With the change of ventilation pressure on working face, the air leakage to goaf is also changing [5], which results in a growing possibility of coal spontaneous combustion in goaf. The goaf means the mined-out area in coal mine, which is the highrisk place of coal spontaneous combustion. On the other hand, extraction of gas will also influence the distribution of the three zones and increase the risk of coal spontaneous combustion, which is still the focus of research in this field.
* Liangzhou Chen [email protected] 1
Key Laboratory of Gas and Fire Control for Coal Mines, School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
2
School of Resource and Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Gas extraction and drainage are the main measures to solve the gas problem during coal mining in high gas mine [6]. It should be pointed out that gas drainage in goaf has the greatest impact on the distribution of oxygen concentration field in goaf [7]. Many scholars have carried out some theoretical and practical researches on the coupling effects of gas extraction and coal spontaneous combustion in goaf. It is suggested that the gas emission from coal mining and coal self-heating reduce the range of
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