煤峪口礦近距離煤層復(fù)合采空區(qū)自燃三帶判定研究
[Abstract]:There is spontaneous combustion in most coal seams in our country, especially with the maturation and popularization of fully mechanized caving coal mining technology, because of the large thickness of coal seams in general, when the mining face after mining, The top coal of the entry and return air roadway falls into the goaf with the collapse of the roof, which results in more coal left in the entry and return air roadway position in the goaf, and it is easy to oxidize and heat up with oxygen, which will cause spontaneous combustion and lead to fire accident. Most coal seams in mines are clustered rather than alone. When mining one of the coal seams in close distance, the near coal seam is affected by mining movement. On the one hand, the stress balance state of the raw coal seam group is destroyed, which results in the stress redistribution in the coal seam rock mass, and a large number of cracks are formed between the coal seams. Complicated air leakage; On the other hand, when mining the lower coal, the rock layer collapses after being affected by the lower coal mining, the coal left over the overlying goaf is further broken, and the upper and lower coal goaf will communicate and form the compound goaf. The distribution of coal in the compound goaf and the complication of the air leakage make it very different from the danger area of spontaneous combustion in the single-layer goaf. In this paper, based on the research background of No. 81004 face in Meiyukou Coal Mine, based on the characteristics of close distance coal seam group mining and nitrogen injection in compound goaf, the three zones of spontaneous combustion of compound goaf are divided into three zones. First of all, according to the characteristics of coal seam in 81004 working face, combined with the mechanism of spontaneous combustion of coal, the characteristics of coal seam in close distance and the actual situation of coal face are analyzed theoretically. Then, the spontaneous combustion characteristics such as oxygen consumption velocity, limit floating coal thickness, exothermic intensity and upper limit air leakage intensity and lower limit oxygen concentration under different floating coal thickness were measured by natural combustion test bench. Finally, according to the related parameters of compound goaf, coal spontaneous combustion characteristic parameters and relevant theoretical knowledge, the mathematical model of composite goaf in short distance coal seam is established, and the related parameters are set up. The contours of oxygen concentration and air leakage intensity in the compound goaf under the condition of nitrogen injection and no nitrogen injection are simulated, respectively. Combined with the field data, the theory of judging the dangerous area of spontaneous combustion in goaf is presented. The three zones of compound goaf under two conditions of nitrogen injection and no nitrogen injection were analyzed and studied. The shortest spontaneous combustion period and the range of oxidized heating zone are obtained from the experimental simulation, and the minimum safe advancing speed of 81004 working face is calculated, so as to ensure that the coal left in the goaf of the overlying face will not be self-ignited.
【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】:TD752.2
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