本文選題：保護層 + 數(shù)值模擬��； 參考：《貴州大學》2015年碩士論文

【摘要】：對于突出礦井保護層的選擇,傳統(tǒng)的方法多以煤質好為優(yōu)先開采原則,而不是優(yōu)先選擇開采突出危險性小或沒有突出性的煤層。通過大量現(xiàn)場調(diào)研結果來看,某些礦井沒有合理的選擇保護層,而是選擇煤質好、煤層厚的煤層進行開采,造成鄰近層瓦斯涌出嚴重,又沒有科學、系統(tǒng)具有針對性的瓦斯治理措施,這樣導致煤礦事故頻發(fā),因此,保護層選擇及煤層群開采順序研究勢在必行。本課題在廣泛收集資料及大量現(xiàn)場調(diào)研的基礎上,針對湘能集團義忠煤礦具體情況,結合理論分析,運用SQL Server2008與Visual Studio2010平臺及C#語言,開發(fā)了“突出礦井保護層選擇系統(tǒng)”。通過FLAC3D數(shù)值模擬,分別對突出礦井保護層選擇、被保護層采掘接替始終處于保護層保護范圍內(nèi)以及煤層群開采順序的研究。運用計算機數(shù)值模擬建立突出礦井保護層選擇系統(tǒng),通過多因素多指標的權重分析,系統(tǒng)建立了第一、二、三級參考標準,輸入礦井煤層實測參數(shù)后,系統(tǒng)會通過事先編譯好的后臺命令進行縱、橫向的對比分析,使模擬結果更加數(shù)值化、具體化,根據(jù)礦井各自的情況可以優(yōu)化得出合適的保護層。針對義忠煤礦,系統(tǒng)成功的優(yōu)化出14號煤層作為保護層比較理想,此系統(tǒng)應用到金佳礦中煤組的6層煤中選擇保護層,最后優(yōu)化出22號煤層作為保護層較理想,從金佳礦已開采的情況來看,選擇22號煤層作為下保護層開采效果不錯,并取得成功。保護層選擇后,研究分析被保護層的采掘接替工作,應用FLAC3D對保護層的保護范圍、以及下保護層開采后對各煤層影響等進行大量的數(shù)值模擬,發(fā)現(xiàn)通過無煤柱護巷與專用瓦斯巷的合理布置,在保護層回采完兩個區(qū)段工作面后,可以實現(xiàn)被保護層采掘接替始終處于保護層保護范圍以內(nèi)這一技術,而通過模擬各被保護層最大垂直主應力、垂直應力、垂直位移、塑性區(qū)及水平方向位移的變化分布情況,可以得出煤層應力釋放和各煤層膨脹變形情況,更好的掌握了保護層開采被保護層采掘工作處于保護范圍內(nèi)這樣一個過程。
[Abstract]:For the selection of protective layer of outburst mine, the traditional method takes the good quality of coal as the first mining principle, not the coal seam with low risk of outburst or no outburst. According to a large number of site investigation results, some mines do not choose a reasonable protective layer, but choose the coal seam with good quality and thick coal seam for mining, which results in serious gas emission from adjacent strata and no science. The system has targeted gas control measures, which leads to frequent accidents in coal mines. Therefore, it is imperative to study the selection of protective layer and mining sequence of coal seams. Based on the extensive collection of data and a great deal of field investigation, according to the concrete situation of Xiangneng Group Yizhong Coal Mine, combined with the theoretical analysis, using SQL Server2008, Visual Studio2010 platform and C # language, the paper develops the "system for selecting the protective layer of outburst mine". Through the numerical simulation of FLAC3D, the selection of protective layer in outburst mine, the mining replacement of protected layer is always within the protection range of protective layer and the mining sequence of coal seam group is studied respectively. The selection system of outburst mine protective layer is established by computer numerical simulation. Through the weight analysis of multiple factors and indexes, the first, second and third level reference standards are established, and the measured parameters of coal seam are inputted. The system will make the simulation result more numerical and concrete by compiling the background command in advance to make the comparative analysis of longitudinal and horizontal. According to the mine's respective situation, the suitable protective layer can be optimized. In view of Yizhong coal mine, the system successfully optimizes 14 coal seam as the protective layer, this system is applied to choose the protective layer in the 6 layers of the coal group in Jinjia mine, and finally optimizes the 22 coal seam as the protective layer. According to the mining situation of Jinjia Coal Mine, the mining effect of No. 22 coal seam as the lower protective layer is good, and it is successful. After the protection layer is selected, the excavation and replacement work of the protected layer is studied and analyzed, and a large number of numerical simulations are carried out on the protection range of the protective layer by using FLAC3D, and on the influence of the mining of the lower protective layer on the coal seams. It is found that through the reasonable arrangement of protecting roadway and special gas roadway without coal pillar, after mining two section working faces in protective layer, the technology of mining and replacing the protected layer can be realized all the time within the protective layer protection range. By simulating the variation and distribution of maximum vertical principal stress, vertical displacement, plastic zone and horizontal displacement in each protected layer, the stress release of coal seam and the swelling deformation of each seam can be obtained. A better grasp of the protective layer mining protected layer mining work in the protection of such a process.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD823.82

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本文編號：1894938