哈拉沟煤矿450m长壁工作面矿压规律研究

发布时间：2018-10-04 18:14

【摘要】：本文以神东矿区哈拉沟煤矿450m长壁工作面开采实践为背景,采用对比实测和理论分析相结合的方法,研究了超长工作面矿压规律并分析了支架等配套设备的适应性。神东矿区哈拉沟煤矿12上101工作面开采较薄煤层,采高2.0m,工作面煤壁长度450m。工作面采用波兰塔高和平顶山煤业的两种双立柱掩护式液压支架进行支护,支架额定工作阻力分别为10660kN和9200kN。12上101工作面布置形状类似“刀把”,前段12上101-1工作面长度为169m,推进长度为247m;12上101-2工作面长度为450m,推进长度为858m。利用工作面开采前后期的长度变化,对两个不同长度工作面的矿压规律进行了实测和对比分析,掌握了12上101工作面较薄煤层超长工作面初采阶段、正常开采阶段和末采阶段的矿压显现规律及顺槽的矿压显现规律。研究发现,450m工作面的周期来压步距为11m,比169m工作面小11.3%;而来压期间的支架阻力、动载系数和来压持续长度分别比169m工作面大2.5%、2.0%和12%,450m长壁工作面周期来压强度较大。通过两个工作面覆岩结构的对比分析得出,工作面长度、直接顶厚度、关键层厚度和位置是矿压显现差异的主要因素。通过实测支架载荷统计分析,建立了支架选型计算方法,得出了450m长壁工作面支架合理工作阻力应为10570kN。巷道观测表明,两工作面顺槽矿压显现差异不大。最后,分析了450m长壁工作面的设备选型合理性。实践表明,450m工作面掘进率降低51.68%,回采率提高了9.9%,工效提高了42.31%,取得了显著的技术和经济效益。本文研究可供为神东及类似矿区较薄煤层超长综采工作面的开采设计和顶板管理提供借鉴。
[Abstract]:Based on the mining practice of 450m longwall face in Haragou coal mine in Shendong mining area, this paper studies the law of mine pressure and analyzes the adaptability of supporting equipment by combining the method of comparative measurement and theoretical analysis. In Hagou coal mine, Shendong mining area, the coal wall length of the coal face is 450 m and the thickness of coal seam is 2.0 m and the mining height is 2.0 m and the length of coal wall is 450 m. The working face is supported by two kinds of double pillar cover hydraulic support in Poland tower height and Pingdingshan coal industry. The rated working resistance of support is 10660kN and 9200kN.12, respectively. The length of 101-1 face is 169m, the length of propelling is 247m, the length of 101-2 face is 450m, and the length of propulsion is 858m. Based on the variation of the length of coal face before and after mining, the law of mine pressure of two different length working faces is measured and compared, and the initial mining stage of super-long coal face in 12upper 101 working face is grasped. The law of rock pressure behavior in normal mining stage and final mining stage and the regularity of rock pressure behavior in the channel. It is found that the interval of periodic pressure is 11m, which is 11.3m less than that of 169m working face, and the support resistance, dynamic load coefficient and continuous length of pressure are 2.5% and 2.0% larger than those of 169m working face and 12450m longwall face respectively. Through the comparative analysis of the overburden structure of the two working faces, it is concluded that the length of the face, the direct top thickness, the thickness and the location of the key layer are the main factors for the difference of the rock pressure appearance. Based on the statistical analysis of the measured support load, the calculation method of support type selection is established, and the reasonable working resistance of the support in 450 m longwall working face should be 10 570 kN. The observation of roadway shows that there is little difference between the two working faces. Finally, the rationality of equipment selection in 450 m long wall face is analyzed. The practice shows that the tunneling rate is reduced by 51.68, the recovery rate is increased by 9.9 percent, the working efficiency is increased by 42.31, and remarkable technical and economic benefits are obtained. The research in this paper can be used as a reference for the mining design and roof management of super-long fully mechanized coal face in Shendong and similar mining areas.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323

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