百子煤礦上行開采可行性研究
發(fā)布時間：2018-08-01 09:45
【摘要】：上行開采過程中,若下部煤層采用柱式開采,則在采動壓力的影響下,可能造成層間巖體及下部煤層采空區(qū)遺留煤柱的失穩(wěn),進而引起上覆巖層的垮落破壞和長壁工作面底板巖層的失穩(wěn),威脅上部煤層采煤工作面的安全生產(chǎn)。因此,開展柱采區(qū)域上方煤層上行開采可行性的研究非常必要。論文以百子煤礦為研究對象,綜合運用理論分析、物理模擬和數(shù)值模擬的方法,對柱式開采的8號煤層上部5號煤層上行長壁開采的可行性進行了研究。理論分析將采動壓力作為分析上行開采可行性的關(guān)鍵參數(shù),給出了采動壓力的預(yù)計公式,得出8號煤層與5號煤層之間最小厚度20m層間巖體的最大破壞深度為3.2m,層間巖體抗拉強度和抗剪強度穩(wěn)定性系數(shù)分別為5.9和4.1,并基于有效面積理論得出下伏8號煤層所留煤柱穩(wěn)定性系數(shù)為2.2,表明層間巖體與8號煤層所留煤柱保持穩(wěn)定。物理模擬實驗研究表明,8號煤層柱式開采過程中承受的最大支承壓力為2.965Mpa;5號煤層長壁推進過程中,老頂初次來壓步距在58m左右,周期來壓平均步距16.7m,來壓過程中的采動壓力僅影響層間巖體的一定深度,層間巖體保持穩(wěn)定;5號煤層采空區(qū)域下方底板巖層中形成明顯的減壓區(qū)域,且頂板來壓時僅在切眼處保護煤柱與煤壁前方煤體下方的傳感器上出現(xiàn)應(yīng)力集中現(xiàn)象,但監(jiān)測到的煤柱支承壓力值均小于4MPa,遠低于8號煤層煤柱的承載強度,表明5號煤層上行開采過程中8號煤層所留煤柱保持穩(wěn)定;數(shù)值模擬實驗揭示了5號煤層長壁開采過程中8號煤層所留煤柱與層間巖體的應(yīng)力分布與演化規(guī)律,表明百子煤礦上行開采時層間巖體和下伏8號煤層煤柱均具有足夠的強度,不會發(fā)生失穩(wěn)現(xiàn)象。論文研究成果對于百子煤礦的上行開采具有指導(dǎo)意義,對于其它類似開采條件煤礦的上行開采也具有良好的借鑒意義。
[Abstract]:In the process of upward mining, if pillar mining is used in the lower coal seam, under the influence of mining pressure, it may cause instability of the coal pillar left over from the interlayer rock mass and the goaf of the lower coal seam. It also causes the collapse of overlying strata and the instability of the floor strata of longwall working face, which threatens the safe production of coal mining face in the upper coal seam. Therefore, it is necessary to study the feasibility of upward coal seam mining in pillar mining area. Taking Baizi coal mine as the research object, the feasibility of mining the governor wall on the upper and 5th coal seam of No. 8 coal seam is studied by using the methods of theoretical analysis, physical simulation and numerical simulation. In the theoretical analysis, the mining pressure is regarded as the key parameter to analyze the feasibility of upstream mining, and the prediction formula of mining pressure is given. It is concluded that the maximum failure depth of 20m interlayer rock mass is 3.2 m, and the stability coefficients of tensile strength and shear strength of interlayer rock mass are 5.9 and 4.1, respectively. Based on the theory of effective area, the maximum failure depth of 20m interlayer rock mass of No. 8 coal seam is obtained. The stability coefficient of coal pillar in coal seam is 2.2, which indicates that the interlayer rock mass and coal pillar left in No. 8 coal seam remain stable. The physical simulation results show that the maximum bearing pressure during pillar mining of No. 8 coal seam is 2.965Mpa. during the long wall propulsive process of No. 5 coal seam, the initial pressure step distance of the main roof is about 58m. The average step distance of periodic pressure is 16.7 m, and the mining pressure only affects the depth of the interlayer rock mass, and the interlayer rock mass remains stable, and an obvious decompression area is formed in the bottom rock layer under the goaf of No. 5 coal seam. When roof pressure comes to press, only the stress concentration phenomenon appears on the sensor under coal pillar and coal body in front of coal wall, but the supporting pressure value of coal pillar is less than 4MPa, which is far lower than the bearing strength of No. 8 coal pillar. The results show that the pillar of No. 8 coal seam remains stable during the upward mining process of No. 5 coal seam, and the stress distribution and evolution law of the pillar and interlayer rock mass of No. 8 coal seam during the long wall mining process of No. 5 coal seam are revealed by numerical simulation. The results show that both the interlayer rock mass and the coal pillar of No. 8 coal seam in Baizi coal mine have sufficient strength and there will be no instability. The research results of this paper have guiding significance for the upstream mining of Baizi coal mine, and also have good reference significance for other similar mining conditions.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD823
本文編號：2157176
[Abstract]:In the process of upward mining, if pillar mining is used in the lower coal seam, under the influence of mining pressure, it may cause instability of the coal pillar left over from the interlayer rock mass and the goaf of the lower coal seam. It also causes the collapse of overlying strata and the instability of the floor strata of longwall working face, which threatens the safe production of coal mining face in the upper coal seam. Therefore, it is necessary to study the feasibility of upward coal seam mining in pillar mining area. Taking Baizi coal mine as the research object, the feasibility of mining the governor wall on the upper and 5th coal seam of No. 8 coal seam is studied by using the methods of theoretical analysis, physical simulation and numerical simulation. In the theoretical analysis, the mining pressure is regarded as the key parameter to analyze the feasibility of upstream mining, and the prediction formula of mining pressure is given. It is concluded that the maximum failure depth of 20m interlayer rock mass is 3.2 m, and the stability coefficients of tensile strength and shear strength of interlayer rock mass are 5.9 and 4.1, respectively. Based on the theory of effective area, the maximum failure depth of 20m interlayer rock mass of No. 8 coal seam is obtained. The stability coefficient of coal pillar in coal seam is 2.2, which indicates that the interlayer rock mass and coal pillar left in No. 8 coal seam remain stable. The physical simulation results show that the maximum bearing pressure during pillar mining of No. 8 coal seam is 2.965Mpa. during the long wall propulsive process of No. 5 coal seam, the initial pressure step distance of the main roof is about 58m. The average step distance of periodic pressure is 16.7 m, and the mining pressure only affects the depth of the interlayer rock mass, and the interlayer rock mass remains stable, and an obvious decompression area is formed in the bottom rock layer under the goaf of No. 5 coal seam. When roof pressure comes to press, only the stress concentration phenomenon appears on the sensor under coal pillar and coal body in front of coal wall, but the supporting pressure value of coal pillar is less than 4MPa, which is far lower than the bearing strength of No. 8 coal pillar. The results show that the pillar of No. 8 coal seam remains stable during the upward mining process of No. 5 coal seam, and the stress distribution and evolution law of the pillar and interlayer rock mass of No. 8 coal seam during the long wall mining process of No. 5 coal seam are revealed by numerical simulation. The results show that both the interlayer rock mass and the coal pillar of No. 8 coal seam in Baizi coal mine have sufficient strength and there will be no instability. The research results of this paper have guiding significance for the upstream mining of Baizi coal mine, and also have good reference significance for other similar mining conditions.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD823
【參考文獻】
相關(guān)期刊論文 前10條
1 喬樹培;馬賽;王治東;;大采高工作面合理煤柱尺寸留設(shè)研究[J];中州煤炭;2016年12期
2 馬亞杰;鄭燕;劉伯;劉金國;;開灤東歡坨礦北二采區(qū)上行開采5煤層可行性分析[J];煤炭工程;2016年S2期
3 王轉(zhuǎn)平;;晉圣億欣煤業(yè)XV108工作面上行開采可行性分析[J];煤炭與化工;2016年10期
4 馮軍發(fā);周英;李回貴;劉闖;;試論近水平煤層采場的3種基本結(jié)構(gòu)形式[J];煤炭學報;2016年10期
5 王紅勝;李森林;李樹剛;雙海清;李斌;李磊;;近距離煤層群下伏厚煤層綜放開采下上行開采技術(shù)[J];西安科技大學學報;2016年05期
6 楊榮寬;宋錦虎;劉帥;張功會;陳坤福;;深部近距離保護層開采煤柱礦壓顯現(xiàn)規(guī)律[J];煤礦安全;2016年09期
7 邵小平;武軍濤;張嘉凡;張杰;;上行開采覆巖裂隙演化規(guī)律與層間巖層穩(wěn)定性研究[J];煤炭科學技術(shù);2016年09期
8 陳彥龍;吳豪帥;;露天礦端幫開采下的支撐煤柱突變失穩(wěn)機理研究[J];中國礦業(yè)大學學報;2016年05期
9 張廣超;何富連;來永輝;宋佳偉;肖鵬;;高強度開采綜放工作面區(qū)段煤柱合理寬度與控制技術(shù)[J];煤炭學報;2016年09期
10 閆浩;張吉雄;張強;董祥儉;韓曉樂;;巨厚火成巖下采動覆巖應(yīng)力場-裂隙場耦合演化機制[J];煤炭學報;2016年09期
相關(guān)重要報紙文章 前1條
1 郭梅;;2016年全國規(guī)模以上原煤產(chǎn)量33.64億噸[N];中國國土資源報;2017年
，本文編號：2157176
本文鏈接：http://sikaile.net/kejilunwen/kuangye/2157176.html
最近更新
教材專著
