哈拉溝煤礦450m長壁工作面礦壓規(guī)律研究
[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.
【學(xué)位授予單位】:西安科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD323
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