發(fā)布時(shí)間：2018-03-13 22:24

  本文選題：淺埋煤層　切入點(diǎn)：大采高　出處：《山東科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：王家塔煤礦位于神府礦區(qū)東勝煤田萬(wàn)利礦區(qū)西南部,煤層埋藏淺、傾角小及上覆厚松散層是該礦區(qū)煤層賦存特點(diǎn)。長(zhǎng)期對(duì)淺埋煤層長(zhǎng)壁開(kāi)采實(shí)踐得出淺埋煤層礦壓顯現(xiàn)較普通埋深工作面強(qiáng)烈等特點(diǎn)。根據(jù)我們對(duì)王家塔煤礦3101—3106工作面的開(kāi)采經(jīng)驗(yàn):工作面礦壓相對(duì)平穩(wěn),無(wú)瓦斯突出、沖擊地壓等地質(zhì)災(zāi)害,且20m回采巷道煤柱偏于安全。結(jié)合王家塔煤礦的實(shí)際地質(zhì)和開(kāi)采條件,研究3107頂板運(yùn)動(dòng)規(guī)律、工作面礦壓規(guī)律和合理煤柱留設(shè)等問(wèn)題。首先利用關(guān)鍵層理論對(duì)3107工作面上覆巖層關(guān)鍵層進(jìn)行判定,經(jīng)理論計(jì)算得出頂板有C1、C2兩個(gè)關(guān)鍵層,利用傳遞巖梁理論以及關(guān)鍵層失穩(wěn)機(jī)理進(jìn)一步分析了其頂板破壞運(yùn)動(dòng)形式。然后根據(jù)KJ216檢測(cè)系統(tǒng)對(duì)工作面礦壓規(guī)律的實(shí)測(cè)結(jié)果分析:最小初撐力必須大于5760KN,來(lái)壓步距,8.7～42.0m,周期來(lái)壓與來(lái)壓步距大小交替出現(xiàn)且工作面礦壓相對(duì)平穩(wěn),進(jìn)一步佐證了上覆巖層中有兩個(gè)關(guān)鍵層的結(jié)論,緊接著對(duì)三條回采巷道的圍巖進(jìn)行動(dòng)態(tài)監(jiān)測(cè)得出,巷道頂?shù)装寮皟蓭妥畲笠七M(jìn)量分別為34mm和15.2mm,巷道礦壓不大、變形微弱,說(shuō)明現(xiàn)有的工作面及巷道支護(hù)方式合理,偏于安全。最后先理論計(jì)算分析合理煤柱寬度,在利用數(shù)值模擬方法對(duì)三條巷道圍巖移動(dòng)及礦壓的分析,寬20m煤柱尺寸允許減小,為降低成本提高回采率,模擬10-20m不同寬度的煤柱,分析了塑性變形及位移、應(yīng)力云圖,總結(jié)得出礦合理的區(qū)段煤柱寬度為12-14m。
[Abstract]:Wangjiata coal mine is located in the southwest of Wanli mining area in Dongsheng coalfield, Shenfu mining area. The coal seam is shallow. Small dip angle and thick overlying loose layer are the characteristics of coal seam in this mining area. The long wall mining practice of shallow coal seam shows that the mine pressure of shallow buried coal seam is stronger than that of ordinary buried coal face. According to our analysis of 3101-3106 work in Wangjiata Coal Mine, Face mining experience: the face pressure is relatively stable, There are no gas outburst, impact ground pressure and other geological hazards, and the coal pillar of 20m mining roadway is on the side of safety. Combined with the actual geology and mining conditions of Wangjiata Coal Mine, the movement law of 3107 roof is studied. First, the key strata of the overlying strata of 3107 face are judged by using the key layer theory, and the two key layers of C _ 1 and C _ 2 are obtained by theoretical calculation. Based on the transfer rock beam theory and the instability mechanism of the key strata, the failure motion of the roof is further analyzed. Then, according to the measured results of the KJ216 detection system, the minimum initial bracing force must be greater than 5760KN, and the pressure of the working face must be higher than 5760KN. The step distance is 8.7 ~ 42.0 m, the interval between the periodic pressure and the pressure step appears alternately, and the mine pressure of the working face is relatively stable. It further proves the conclusion that there are two key strata in the overlying strata. Then, the dynamic monitoring of the surrounding rock of the three mining roadways shows that the maximum moving quantities of the roof and floor and the two sides of the roadway are 34mm and 15.2mm respectively, and the mine pressure of the roadway is not large and the deformation is weak. At last, the reasonable coal pillar width is calculated and analyzed theoretically. In the analysis of surrounding rock movement and rock pressure of three roadways by numerical simulation, the width of coal pillar is allowed to decrease by 20m. In order to reduce the cost and increase the recovery rate, the plastic deformation, displacement and stress cloud map of coal pillars with different widths of 10-20m were simulated, and the reasonable coal pillar width of 12-14m was concluded.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD323;TD822.3

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