本文選題：舊采區(qū)二次回采 + 三維數(shù)值模擬�。� 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：本論文以晉煤集團(tuán)天安圣華煤業(yè)有限公司3#煤層舊采區(qū)二次回采首采工作面的實(shí)際地質(zhì)資料為基礎(chǔ)，通過理論公式計(jì)算、RFPA數(shù)值模擬相結(jié)合的方式，，研究了：舊采區(qū)不同情況下遺留煤柱狀態(tài)，及舊采巷道狀態(tài)，并對(duì)兩者的影響因素進(jìn)行了分析；舊采區(qū)二次回采掘進(jìn)時(shí)與舊采巷道的安全煤柱寬度以及應(yīng)力、位移分布規(guī)律；舊采區(qū)二次回采采煤工作面初次來壓分布規(guī)律。通過對(duì)上述內(nèi)容的研究，得出了以下結(jié)論： （1）利用理論分析和三維數(shù)值模擬方法研究了煤柱狀態(tài)，得出了：①舊采區(qū)的遺留煤柱大部分處于穩(wěn)定狀態(tài)；舊采巷道大部分以空巷、空區(qū)為主。②巷寬、巷高、煤柱1、2寬度對(duì)遺留煤柱及舊采巷道的狀態(tài)均有一定的影響，遺留煤柱狀態(tài)主要受煤柱本身寬度的影響，接下來是附近巷道巷高、巷寬的影響；舊采巷道狀態(tài)主要受本巷巷高及巷寬的影響。 （2）通過二維數(shù)值模擬的方法，研究了舊采區(qū)巷道掘進(jìn)工作面的應(yīng)力、位移分布變化規(guī)律。得出了：①隨著舊采巷道斷面的增大，安全煤柱寬度增大，空巷時(shí)煤柱的安全寬度為5m,空區(qū)時(shí)煤柱的安全寬度為15m，冒落區(qū)時(shí)的煤柱安全距離為20m；②二次掘進(jìn)時(shí)，工作面應(yīng)力基本上都比開挖前要降低、位移比開挖前要大，舊采巷道斷面越大，應(yīng)力、位移變化率越大。③在煤柱寬度小于與大于安全煤柱寬度時(shí)，應(yīng)力、位移分布規(guī)律差別十分明顯。小于安全煤柱寬度時(shí)，應(yīng)力降低區(qū)域很大，位移只存在一個(gè)較大的峰值；大于安全煤柱寬度時(shí)，應(yīng)力降低區(qū)域較小，一般存在兩個(gè)位移峰值。④當(dāng)煤柱寬度超過安全煤柱寬度后，應(yīng)力、位移變化率變化不大 （3）通過理論分析與二維數(shù)值模擬方法研究了直接頂和頂煤初次來壓分布規(guī)律，得出了：①按照理論計(jì)算得出的正�；夭沙醮蝸韷翰骄酁�8.13～11.50m，采用數(shù)值模擬方法得出的初次來壓步距為11m。②從應(yīng)力分布圖中可以看出，來壓時(shí)的應(yīng)力分布規(guī)律與未來壓時(shí)的規(guī)律明顯不同，來壓時(shí)最大應(yīng)力值明顯比未來壓時(shí)的最大值大，且最小值明顯比未來壓時(shí)最小值小。③隨著舊采巷道斷面的增加，二次回采受到舊采巷道的影響也越大，主要表現(xiàn)在，初次來壓步距越來越�。蛔畲髴�(yīng)力越來越大，應(yīng)力集中系數(shù)也越來越大；工作面首次出現(xiàn)破裂的步距也越來越�。还ぷ髅媲胺降目枕斁嚯x越來越大，回采難度也相應(yīng)的增大；應(yīng)力降低范圍也越來也大。④當(dāng)舊采巷道斷面一定時(shí)，隨著距離的增大，舊采巷道對(duì)工作面的影響趨于穩(wěn)定，即舊采巷道對(duì)工作面的影響存在一臨界值，超過該值，繼續(xù)增大距離，二次回采初次來壓分布規(guī)律基本不變。
[Abstract]:This paper is based on the actual geological data of the secondary first mining face in the coal seam old mining area of Tianan Shenghua Coal Industry Co., Ltd., Jin Coal Group, and combines the numerical simulation of RFPA with the theoretical formula. The paper studies the status of coal pillar and roadway in old mining area, and analyzes the influencing factors of them, the width, stress and displacement distribution of safe coal pillar during secondary mining excavation and old roadway in old mining area; Distribution of the first pressure in the secondary mining face in the old mining area. Through the study of the above contents, the following conclusions are reached: 1) by using theoretical analysis and three-dimensional numerical simulation method, the paper studies the status of coal pillar, and concludes that most of the remaining coal pillars in the old mining area of 1 / 1 are in a stable state, and most of the old roadways are empty roadway, the main goaf is 2. 2 roadway width, and the roadway is high. The width of pillar 1 ~ 2 has a certain influence on the status of the remaining coal pillar and the old mining roadway. The state of the remaining coal pillar is mainly affected by the width of the coal pillar itself, and the next is the height and width of the roadway nearby. The state of the old roadway is mainly affected by the height and width of the roadway. 2) by means of two-dimensional numerical simulation, the stress and displacement distribution of roadway excavation face in old mining area is studied. It is concluded that with the increase of the section of the old roadway, the width of the safe pillar increases, the safe width of the pillar in the empty roadway is 5 m, the safe width of the pillar in the empty area is 15 m, and the safe distance of the pillar in the caving area is 20 m when the coal pillar is driven twice. The stress of working face is basically lower than that before excavation, the displacement is larger than that before excavation, the bigger the section of old roadway is, the greater the stress and displacement change rate is. 3. When the width of coal pillar is smaller than that of safe pillar, the stress is larger than that of safe pillar. The law of displacement distribution is quite different. When the width of coal pillar is smaller than that of safe coal pillar, the region of stress decrease is very large, and the peak value of displacement exists only, and when the width of coal pillar is larger than that of safe coal pillar, the region of stress decrease is smaller. Generally, there are two peak displacement peaks. 4. When the width of coal pillar exceeds the width of safe pillar, the change rate of stress and displacement does not change much. Through theoretical analysis and two-dimensional numerical simulation, the first pressure distribution of direct top coal and top coal is studied. It is obtained that the first step distance of normal mining is 8.13 ~ 11.50 m calculated according to the theory. The initial pressure step distance obtained by numerical simulation method is 11m.2, which can be seen from the stress distribution diagram. The law of stress distribution in the coming pressure is obviously different from that in the future. The maximum stress value in the coming pressure time is obviously larger than the maximum value in the future pressure time, and the minimum value is obviously smaller than the minimum value in the future pressure time. 3. With the increase of the section of the old mining roadway, the minimum stress distribution law is obviously smaller than that of the future pressure time. The influence of the old roadway on the secondary mining is more and more, mainly in the following aspects: the first pressure step is becoming smaller and smaller; the maximum stress is becoming larger and larger, the stress concentration factor is becoming larger and larger; the distance between the first breakup of the working face is also becoming smaller and smaller. The gap distance in front of the face is getting larger and larger, the difficulty of mining is also increasing correspondingly, and the decreasing range of stress is also increasing. When the section of the old roadway is fixed, the influence of the old roadway on the working face tends to be stable with the increase of the distance. That is to say, there is a critical value for the influence of the old roadway on the working face, beyond which the distance continues to increase, and the distribution law of the first pressure in the secondary mining is basically unchanged.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD323

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李鳳儀;王維維;;薄煤層下分層復(fù)采工作面頂板控制技術(shù)[J];礦業(yè)安全與環(huán)保;2009年01期

2 霍丙杰;侯世占;;關(guān)于提高回采率的思考[J];礦業(yè)工程;2006年05期

3 王進(jìn)前;近壁采煤法在復(fù)采區(qū)的應(yīng)用[J];河北煤炭;1995年01期

4 侯文高;衰老礦井廢舊巷道利用及其經(jīng)濟(jì)效益[J];河北煤炭;1999年02期

5 康小衛(wèi),張治軍;淺議殘煤的開采技術(shù)[J];江蘇煤炭;2004年03期

6 王挺;;應(yīng)用多目標(biāo)規(guī)劃實(shí)現(xiàn)衰老礦井資源優(yōu)化開發(fā)[J];江西煤炭科技;2006年01期

7 王明立;張華興;張剛艷;;刀柱式老采空區(qū)上行長(zhǎng)壁開采的采礦安全評(píng)價(jià)[J];采礦與安全工程學(xué)報(bào);2008年01期

8 賈光勝,李晉平,康立軍,李洪武,王建強(qiáng),胡守平;綜放高效回收殘采區(qū)的試驗(yàn)研究[J];煤礦開采;1999年04期

9 王學(xué)濱,潘一山,盛謙,張芳;底煤復(fù)采的快速拉格朗日大變形分析[J];煤礦開采;2001年03期

10 安兆忠;國(guó)有煤礦應(yīng)做好煤炭復(fù)采的文章[J];煤炭企業(yè)管理;2003年05期

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