豫西松软煤层掘进工作面低指标突出机理及应用研究

发布时间：2018-08-10 17:15

【摘要】：本文选取松软煤层掘进工作面低指标突出这一特殊条件下的突出为研究对象,以豫西矿区某矿二1-21010机巷掘进工作面为研究背景,对松软煤层掘进工作面低指标突出进行了理论分析,重点围绕突出的发动和发展机理进行研究。主要分析掘进工作面围岩应力、瓦斯压力及煤层物理性质三者之间对突出的作用机制。围绕不同条件下掘进工作面前方极限平衡区(塑性区)宽度大小、围岩位移变形破坏程度,以及应力分布等方面进行对比,对松软煤层掘进工作面低指标突出进行了较为系统的研究。并根据研究结论对松软煤层掘进工作面防突措技术施进行了研究,并设计了相关防突措施。主要研究成果如下:(1)分析了松软煤层低指标突出各影响因素之间的作用机制,并对低指标突出进行了归类;(2)确立了松软煤层掘进工作面突出危险性与工作面前方极限平衡区(塑性区)宽度的关系,极限平衡区宽度越大,突出危险性越大;反之突出危险性越小;(3)通过数值模拟对比,发现煤巷掘进过程中,煤质越松软,突出危险性越大;突出危险性也随着煤层厚度的增厚而变大;相同条件下,沿顶掘巷比沿底掘巷突出危险性小;(4)防突技术措施研究表明,对巷道围岩进行加强支护、合理选取布巷方式可以有效减小围岩位移变形,缩小塑性区的分布范围,降低应力集中程度,进而降低掘进工作面突出危险性。
[Abstract]:In this paper, the low index outburst of soft coal mining face is selected as the research object, and the mining face of No. 1-21010 machine roadway in a mining area in the west of Henan Province is taken as the research background. In this paper, the low index outburst of soft coal mining face is analyzed theoretically, and the mechanism of outburst initiation and development is studied. The action mechanism of surrounding rock stress, gas pressure and coal seam physical properties on outburst is analyzed. Comparing the width of the limit equilibrium zone (plastic zone) in front of the heading face under different conditions, the degree of displacement, deformation and failure of surrounding rock, and the distribution of stress, etc. The low index outburst of driving face in soft coal seam is studied systematically. According to the research conclusion, the paper studies the technology of preventing outburst in soft coal mining face, and designs the relevant measures to prevent outburst. The main research results are as follows: (1) the mechanism of influencing factors of low index outburst in soft coal seam is analyzed. The low index outburst is classified as follows: (2) the relationship between the outburst risk and the width of the limit equilibrium zone (plastic zone) in front of the working face is established. The greater the width of the limit equilibrium zone, the greater the outburst risk; On the contrary, the smaller the outburst risk is; (3) through numerical simulation and comparison, it is found that the softer the coal quality is, the greater the outburst risk is; the greater the outburst risk is with the thickness of coal seam; under the same conditions, (4) the study of outburst prevention technology measures shows that strengthening support for surrounding rock of roadway and reasonable selection of roadway arrangement can effectively reduce the displacement and deformation of surrounding rock and reduce the distribution range of plastic zone. Reduce the degree of stress concentration, and then reduce the danger of tunneling face outburst.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD713.1

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