两硬超长大采高工作面煤柱变形及其对煤柱自燃影响研究
发布时间：2019-06-10 05:50
【摘要】：我国矿井煤炭自燃倾向性较高的煤矿占有较大比例,因煤炭自燃导致自然资源浪费十分严重。另外,煤炭自燃对煤矿的安全生产有较大影响,导致减产,甚至威胁人员健康。超长工作面大采高开采技术工艺因其高产高效应用越来越广,然而超长大采高工作面矿山压力较大,造成煤柱变形破坏严重,在一些矿井导致煤柱自燃,形成了煤矿生产的安全隐患。本文以察哈素煤矿31303开采工作面为背景,对两硬超长大采高工作面煤柱变形破坏及其对煤柱自燃的影响进行研究。在煤柱变形破坏和裂隙发育方面,进行了FLAC3D数值模拟和相似材料模拟实验。数值模拟结果表明:(1)在开采推进过20m的时候,煤柱逐渐出现变形破坏的情况,通常发生在煤柱的左右两壁;(2)推进过40m时,破坏开始贯通煤柱,且剪切破坏区域呈现逐步扩展的趋势;(3)察哈素煤矿31303开采工作面煤柱开采过程中,煤柱损伤、破坏严重、煤柱中应力集中现象较为明显,导致内部出现破坏裂隙,形成连续、适量漏风供氧的条件。通过相似材料模拟实验可得:(1)煤柱变形破坏和裂隙发育的特点;(2)将相似材料模拟实验结果与FLAC3D数值模拟进行对比分析可知,两种模拟结果具有一致性。在煤柱自燃方面综合对煤炭自燃理论和煤柱变形破坏的研究,对煤柱自燃进行科学探究:(1)对煤炭自燃学说进行了系统的阐述并对煤氧复合的微观过程展开分析和说明;(2)说明了煤炭自燃的发展阶段和煤炭自燃所需具备的条件,据此对煤柱进行自燃条件分析;(3)从察哈素煤矿31303工作面过往的火灾实例中进行分析,对煤柱变形对自燃的影响进行实例分析并提出防治措施。
[Abstract]:Coal mines with high spontaneous combustion tendency account for a large proportion of coal mines in China, and the waste of natural resources is very serious due to spontaneous combustion of coal. In addition, coal spontaneous combustion has a great impact on the safety of coal mine production, resulting in production reduction, and even threatening the health of people. The large mining height mining technology in super long working face is more and more widely used because of its high yield and high efficiency. However, the mine pressure in super long and large mining height working face is large, resulting in serious deformation and damage of coal pillar, which leads to spontaneous combustion of coal pillar in some mines. The hidden danger of coal mine production has been formed. In this paper, based on the 31303 working face of Csu Coal Mine, the deformation and failure of coal pillar and its influence on spontaneous combustion of coal pillar in two hard super long and large mining height working faces are studied. In the aspects of deformation and failure of coal pillar and fracture development, FLAC3D numerical simulation and similar material simulation experiments are carried out. The results of numerical simulation show that: (1) when the mining is pushed through 20m, the deformation and failure of the coal pillar will gradually occur, which usually occurs on the left and right walls of the coal pillar; (2) when the coal pillar is pushed forward for 40 m, the failure begins to pass through the coal pillar, and the shear failure area tends to expand step by step. (3) in the mining process of coal pillar in 31303 working face of Csu Coal Mine, the damage and damage of coal pillar are serious, and the phenomenon of stress concentration in coal pillar is obvious, which leads to the failure of cracks in the interior and the formation of continuous and proper air leakage and oxygen supply conditions. Through the simulation experiment of similar materials, the following results can be obtained: (1) the characteristics of deformation and failure of coal pillar and the development of cracks; (2) the results of similar material simulation are compared with those of FLAC3D numerical simulation, and it can be seen that the two simulation results are consistent. In the aspect of spontaneous combustion of coal pillar, the theory of spontaneous combustion of coal pillar and the deformation and failure of coal pillar are comprehensively studied, and the spontaneous combustion of coal pillar is studied scientifically: (1) the theory of spontaneous combustion of coal is systematically expounded and the microcosmic process of coal and oxygen compound is analyzed and explained; (2) the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion are explained, and the spontaneous combustion conditions of coal pillar are analyzed according to the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion. (3) the influence of coal pillar deformation on spontaneous combustion is analyzed from the past fire examples of 31303 working face in Cusu Coal Mine, and the prevention and control measures are put forward.
【学位授予单位】：华北科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD752.2
[Abstract]:Coal mines with high spontaneous combustion tendency account for a large proportion of coal mines in China, and the waste of natural resources is very serious due to spontaneous combustion of coal. In addition, coal spontaneous combustion has a great impact on the safety of coal mine production, resulting in production reduction, and even threatening the health of people. The large mining height mining technology in super long working face is more and more widely used because of its high yield and high efficiency. However, the mine pressure in super long and large mining height working face is large, resulting in serious deformation and damage of coal pillar, which leads to spontaneous combustion of coal pillar in some mines. The hidden danger of coal mine production has been formed. In this paper, based on the 31303 working face of Csu Coal Mine, the deformation and failure of coal pillar and its influence on spontaneous combustion of coal pillar in two hard super long and large mining height working faces are studied. In the aspects of deformation and failure of coal pillar and fracture development, FLAC3D numerical simulation and similar material simulation experiments are carried out. The results of numerical simulation show that: (1) when the mining is pushed through 20m, the deformation and failure of the coal pillar will gradually occur, which usually occurs on the left and right walls of the coal pillar; (2) when the coal pillar is pushed forward for 40 m, the failure begins to pass through the coal pillar, and the shear failure area tends to expand step by step. (3) in the mining process of coal pillar in 31303 working face of Csu Coal Mine, the damage and damage of coal pillar are serious, and the phenomenon of stress concentration in coal pillar is obvious, which leads to the failure of cracks in the interior and the formation of continuous and proper air leakage and oxygen supply conditions. Through the simulation experiment of similar materials, the following results can be obtained: (1) the characteristics of deformation and failure of coal pillar and the development of cracks; (2) the results of similar material simulation are compared with those of FLAC3D numerical simulation, and it can be seen that the two simulation results are consistent. In the aspect of spontaneous combustion of coal pillar, the theory of spontaneous combustion of coal pillar and the deformation and failure of coal pillar are comprehensively studied, and the spontaneous combustion of coal pillar is studied scientifically: (1) the theory of spontaneous combustion of coal is systematically expounded and the microcosmic process of coal and oxygen compound is analyzed and explained; (2) the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion are explained, and the spontaneous combustion conditions of coal pillar are analyzed according to the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion. (3) the influence of coal pillar deformation on spontaneous combustion is analyzed from the past fire examples of 31303 working face in Cusu Coal Mine, and the prevention and control measures are put forward.
【学位授予单位】：华北科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD752.2
【参考文献】
相关期刊论文 前10条
1 邓军;李贝;肖e，
本文编号：2496222
本文链接：https://www.wllwen.com/kejilunwen/anquangongcheng/2496222.html
