极近距离下位煤层采准巷道优化布置及支护研究

发布时间：2018-05-31 12:50

本文选题：极近距离煤层 + 应力传递　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：极近距离煤层群在我国分布广泛，国内外对其开采难题有一定研究，但关于开采技术的相关理论成果较少，大多数为实践性和经验性的总结，因此深入研究极近距离煤层群开采，对实现矿井安全高效生产具有重要意义。本文以五虎山煤矿为背景，以9#、10#煤层为研究对象，采用理论分析、数值模拟、力学计算相结合的综合研究方法，对极近距离下位煤层采准巷道的合理布置进行了系统的研究。论文首先从定性、定量两方面解释了何为极近距离煤层群，从定性的角度分析：煤层层间距很小，且开采时上下相互影响明显的煤层群为极近距离煤层群；从定量方面分析：将煤层底板损伤深度h作为划分极近距离煤层的依据，，即当煤层间距h时为极近距离煤层群。紧接着文章介绍了工作面巷道四种布置方式的优缺点。之后采用理论分析的方式，研究了煤柱合理宽度的留设、底板应力传递及分布规律，以及上煤层开采底板损伤状态；在此基础上，分析弹性区和极限平衡区的长度范围，推算出巷道布置（外错式）的理论错距（外错）计算公式，同理根据底板破坏范围分析结论，推算出巷道内错式、平错式的理论错距公式，并结合五虎山煤矿的具体情况，最终确定1004工作面采用平错式布置。然后通过FLAC3D数值模拟对9#煤层残留煤柱下方各方案巷道的矿压规律、巷道围岩稳定性进行分析研究，充分验证了理论分析的合理性。最后采用力学计算的方法，对巷道支护材料作了深入研究，选定29U型钢为1004巷道支护材料。工程实践表明，支架在受到不均匀压力时，极易产生变形、破坏，故提出了预防支护体产生受力不均的几种方法，即把握好工程质量、做好刹顶背帮工作、优化巷道布置、增加支护材料支撑力。根据矿方开采效果反馈，该研究中巷道布置位置是合理的，支护方案及受力不均处理是有效的，对类似条件开采有一定的参考价值。
[Abstract]:The very close distance coal seam group is widely distributed in our country. There is some research on the mining problem at home and abroad, but there are few related theoretical achievements on mining technology, most of which are the summary of practice and experience. Therefore, it is of great significance to study the mining of very close-distance coal seams in order to realize mine safety and high-efficiency production. Taking Wuhushan coal mine as the background, taking 9 #y10# coal seam as the research object, using the comprehensive research method of theoretical analysis, numerical simulation and mechanical calculation, this paper systematically studies the reasonable arrangement of mining roadway at very close distance in coal seam. This paper first explains what is a very close distance coal seam group from the qualitative and quantitative aspects. From the qualitative point of view, the coal seam group with small coal layer spacing and obvious interaction between the upper and lower coal layers is a very close distance coal seam group; The quantitative analysis shows that the damage depth h of coal floor is taken as the basis for dividing the very close coal seam, that is, when the coal seam spacing h, it is a very close distance coal seam group. Then the article introduces the advantages and disadvantages of the four layout ways of working face roadway. Then, by means of theoretical analysis, the reasonable width of coal pillar, the law of stress transfer and distribution of floor, and the damage state of mining floor in upper coal seam are studied, and the length range of elastic zone and limit equilibrium zone are analyzed. The formula of theoretical offset (outer fault) of roadway layout is calculated. According to the conclusion of analysis on the failure range of floor plate, the formula of theoretical offset of roadway internal and flat fault is deduced, and the concrete situation of Wuhushan Coal Mine is combined. Finally, it is determined that 1004 working face adopts flat and wrong arrangement. Then, through FLAC3D numerical simulation, the rock pressure law and surrounding rock stability of roadway under residual pillar in 9# coal seam are analyzed and studied, which fully verifies the rationality of theoretical analysis. Finally, the mechanical calculation method is used to study the supporting material of roadway, and the 29U section steel is selected as the support material of 1004 roadway. The engineering practice shows that the support is easily deformed and destroyed when it is subjected to uneven pressure. Therefore, several methods to prevent the uneven force of the support body are put forward, that is, to grasp the engineering quality, to do well the work of the back of the brake roof, and to optimize the layout of the roadway. Increase the supporting force of the support material. According to the feedback of mining effect, the location of roadway layout is reasonable in this study, and the support scheme and uneven force treatment are effective, which has certain reference value for mining under similar conditions.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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