【摘要】：我國礦井煤炭自燃傾向性較高的煤礦占有較大比例,因煤炭自燃導致自然資源浪費十分嚴重。另外,煤炭自燃對煤礦的安全生產(chǎn)有較大影響,導致減產(chǎn),甚至威脅人員健康。超長工作面大采高開采技術工藝因其高產(chǎn)高效應用越來越廣,然而超長大采高工作面礦山壓力較大,造成煤柱變形破壞嚴重,在一些礦井導致煤柱自燃,形成了煤礦生產(chǎn)的安全隱患。本文以察哈素煤礦31303開采工作面為背景,對兩硬超長大采高工作面煤柱變形破壞及其對煤柱自燃的影響進行研究。在煤柱變形破壞和裂隙發(fā)育方面,進行了FLAC3D數(shù)值模擬和相似材料模擬實驗。數(shù)值模擬結果表明:(1)在開采推進過20m的時候,煤柱逐漸出現(xiàn)變形破壞的情況,通常發(fā)生在煤柱的左右兩壁;(2)推進過40m時,破壞開始貫通煤柱,且剪切破壞區(qū)域呈現(xiàn)逐步擴展的趨勢;(3)察哈素煤礦31303開采工作面煤柱開采過程中,煤柱損傷、破壞嚴重、煤柱中應力集中現(xiàn)象較為明顯,導致內(nèi)部出現(xiàn)破壞裂隙,形成連續(xù)、適量漏風供氧的條件。通過相似材料模擬實驗可得:(1)煤柱變形破壞和裂隙發(fā)育的特點;(2)將相似材料模擬實驗結果與FLAC3D數(shù)值模擬進行對比分析可知,兩種模擬結果具有一致性。在煤柱自燃方面綜合對煤炭自燃理論和煤柱變形破壞的研究,對煤柱自燃進行科學探究:(1)對煤炭自燃學說進行了系統(tǒng)的闡述并對煤氧復合的微觀過程展開分析和說明;(2)說明了煤炭自燃的發(fā)展階段和煤炭自燃所需具備的條件,據(jù)此對煤柱進行自燃條件分析;(3)從察哈素煤礦31303工作面過往的火災實例中進行分析,對煤柱變形對自燃的影響進行實例分析并提出防治措施。
[Abstract]:Coal mines with high spontaneous combustion tendency account for a large proportion of coal mines in China, and the waste of natural resources is very serious due to spontaneous combustion of coal. In addition, coal spontaneous combustion has a great impact on the safety of coal mine production, resulting in production reduction, and even threatening the health of people. The large mining height mining technology in super long working face is more and more widely used because of its high yield and high efficiency. However, the mine pressure in super long and large mining height working face is large, resulting in serious deformation and damage of coal pillar, which leads to spontaneous combustion of coal pillar in some mines. The hidden danger of coal mine production has been formed. In this paper, based on the 31303 working face of Csu Coal Mine, the deformation and failure of coal pillar and its influence on spontaneous combustion of coal pillar in two hard super long and large mining height working faces are studied. In the aspects of deformation and failure of coal pillar and fracture development, FLAC3D numerical simulation and similar material simulation experiments are carried out. The results of numerical simulation show that: (1) when the mining is pushed through 20m, the deformation and failure of the coal pillar will gradually occur, which usually occurs on the left and right walls of the coal pillar; (2) when the coal pillar is pushed forward for 40 m, the failure begins to pass through the coal pillar, and the shear failure area tends to expand step by step. (3) in the mining process of coal pillar in 31303 working face of Csu Coal Mine, the damage and damage of coal pillar are serious, and the phenomenon of stress concentration in coal pillar is obvious, which leads to the failure of cracks in the interior and the formation of continuous and proper air leakage and oxygen supply conditions. Through the simulation experiment of similar materials, the following results can be obtained: (1) the characteristics of deformation and failure of coal pillar and the development of cracks; (2) the results of similar material simulation are compared with those of FLAC3D numerical simulation, and it can be seen that the two simulation results are consistent. In the aspect of spontaneous combustion of coal pillar, the theory of spontaneous combustion of coal pillar and the deformation and failure of coal pillar are comprehensively studied, and the spontaneous combustion of coal pillar is studied scientifically: (1) the theory of spontaneous combustion of coal is systematically expounded and the microcosmic process of coal and oxygen compound is analyzed and explained; (2) the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion are explained, and the spontaneous combustion conditions of coal pillar are analyzed according to the development stage of coal spontaneous combustion and the necessary conditions of coal spontaneous combustion. (3) the influence of coal pillar deformation on spontaneous combustion is analyzed from the past fire examples of 31303 working face in Cusu Coal Mine, and the prevention and control measures are put forward.
【學位授予單位】：華北科技學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD752.2

【參考文獻】

相關期刊論文 前10條

1 鄧軍;李貝;肖e，

本文編號：2496222