【摘要】：高瓦斯煤層群工作面開采時,由于采動的影響使得上鄰近層含瓦斯煤層瓦斯解吸并涌入工作面,導(dǎo)致工作面瓦斯超限,所以上鄰近層卸壓瓦斯抽采越來越受到重視。陽泉五礦15#煤層8210工作面開采過程中,覆巖內(nèi)采動卸壓瓦斯涌出量占工作面瓦斯涌出量的90%,針對單獨(dú)使用一條走向高抽巷抽采不能解決工作面瓦斯超限的問題,提出使用走向高抽巷配合傾向鉆孔抽采覆巖上鄰近層卸壓瓦斯,即使用本工作面高抽巷抽采回風(fēng)側(cè)裂隙帶瓦斯的同時,利用相鄰備用工作面高抽巷布置傾向鉆孔,終孔位于采煤工作面進(jìn)風(fēng)巷內(nèi)側(cè)頂板裂隙帶內(nèi),抽采進(jìn)風(fēng)側(cè)裂隙帶內(nèi)的卸壓瓦斯,從而增加覆巖裂隙卸壓瓦斯抽采范圍�；�8210工作面覆巖巖層地質(zhì)狀況及含瓦斯煤巖層分布,結(jié)合理論研究、數(shù)值模擬等方法研究了工作面開采后覆巖巖層應(yīng)力重新分布、覆巖裂隙分布、卸壓瓦斯流動、卸壓瓦斯抽采方法及抽采效果,為覆巖裂隙帶卸壓瓦斯抽采提供重要參考,具體研究內(nèi)容如下:(1)研究工作面開采后,覆巖內(nèi)采動裂隙分布,從而確定覆巖內(nèi)卸壓瓦斯富集區(qū)域,為走向高抽巷及傾向鉆孔布置提供依據(jù)。首先使用FLAC3D模擬軟件建立8210工作面開采模型,通過分析工作面開挖后的上覆巖層塑性變形、運(yùn)動位移變化、應(yīng)力重新分布變化,最終得出工作面開采后覆巖內(nèi)部裂隙場分布及卸壓瓦斯運(yùn)移通道位置。分析模擬結(jié)果可知:頂板上方40m以內(nèi)主要發(fā)生拉破壞,50-70m以內(nèi)主要發(fā)生剪破壞;距離工作面頂板50m以上覆巖內(nèi)部應(yīng)力下降梯度已經(jīng)明顯減小,且下沉位移量突然銳減,頂板70m以上覆巖應(yīng)力卸壓值小于20%,下沉位移量量接近0;水平方向距離進(jìn)回風(fēng)巷25-35m范圍內(nèi)覆巖水平位移差值最大,水平應(yīng)力變化量也最大,表明此區(qū)域處于縱向裂隙發(fā)育區(qū)。因此,綜合分析得出裂隙瓦斯富集通道垂直距離煤層頂板50-70m,水平距離巷道25-35m。(2)根據(jù)工作面開挖模擬覆巖裂隙分布結(jié)果,建立覆巖裂隙卸壓瓦斯抽采模型,模擬走向高抽巷及傾向鉆孔抽采覆巖卸壓瓦斯抽采效果和抽采范圍。首先利用COMSOL軟件建立8210工作面覆巖卸壓瓦斯抽采模型,并根據(jù)覆巖內(nèi)部裂隙分布及瓦斯涌出源項設(shè)置模型的孔隙率滲透率及各源項卸壓瓦斯通量,對比分析抽放前后覆巖內(nèi)瓦斯壓力云圖可得:抽采40天后,走向高抽巷一側(cè),豎直方向上瓦斯裂隙通道內(nèi)瓦斯壓力由原始的2MPa降至0.6Mpa,水平方向26m以內(nèi)瓦斯壓力降至0.74MPa;單個傾向鉆孔周邊7.5m處瓦斯壓力由2MPa降至0.74MPa,根據(jù)鉆孔有效抽采半徑定義得知鉆孔的有效抽放半徑為7.5m。(3)根據(jù)模擬覆巖卸壓瓦斯抽采效果及抽采范圍,設(shè)計8210工作面覆巖布置走向高抽巷及傾向鉆孔布置參數(shù)。走向高抽巷設(shè)置在覆巖裂隙帶下部,垂向距離采空區(qū)頂板55m位置處,水平方向距回風(fēng)巷30m;傾向鉆孔鉆場設(shè)置在布置在相鄰備采工作面高抽巷內(nèi),每隔30m布置一個鉆場,每個鉆場布置9個鉆孔,各鉆孔孔口相距0.5m,終孔相距13m,鉆孔長度為100m—120m。(4)結(jié)合模擬結(jié)果及8210工作面覆巖走向高抽巷配合傾向鉆孔抽采布置設(shè)計參數(shù),計算預(yù)測布置走向高抽巷及傾向鉆孔后工作面瓦斯抽采效果,預(yù)測得知:走向高抽巷及傾向鉆孔有效抽采范圍內(nèi)瓦斯含量由18.69m3/m3降至3.37m3/m3,降低82%;走向高抽巷單位時間瓦斯抽采量為40.78m3/min,傾向鉆孔單位時間瓦斯抽采量為27.58m3/min,傾向鉆孔瓦斯抽采能力為走向高抽巷的67.4%;根據(jù)工作面瓦斯涌出量,計算可知單獨(dú)使用走向高抽巷抽采時,工作面瓦斯抽采率為47.8%,配合傾向鉆孔后,工作面瓦斯抽采率由47.8%提升至79.7%,瓦斯抽采達(dá)標(biāo)。
[Abstract]:In the mining of high gas coal seam group, due to the influence of mining movement, the gas in the upper adjacent layer contains gas to desorb and pour into the working face, resulting in gas exceeding in the working face, so the gas extraction of the upper adjacent layer is getting more and more attention. in the mining process of the 8210 working face of the 15 # coal seam of Yangquan Five Mine, the gas emission amount in the overlying rock accounts for 90% of the gas emission amount in the working face, the invention provides a method for discharging pressure gas by using an adjacent layer on an adjacent layer of a high-suction tunnel in the working face, and the final hole is positioned in the crack belt inside the top plate of the air inlet tunnel of the coal mining working face, and the pressure relief gas in the crack belt on the air inlet side is extracted, thereby increasing the gas extraction range of the rock discharge pressure of the overlying rock. Based on the geological conditions of rock-overlying strata in the 8210 working face and the distribution of gas-bearing strata, combined with theoretical research and numerical simulation, the redistribution of stress redistribution of rock-overlying strata, distribution of rock-overlying fracture, pressure relief gas flow, pressure relief gas extraction and extraction effect are studied. This paper provides an important reference for the gas extraction and extraction of rock-covered fracture zone. The specific research contents are as follows: (1) After the mining of the working face, the distribution of the fracture distribution in the overlying rock is studied, so as to determine the area of gas accumulation in the overlying rock, and provide the basis for moving towards the high suction lane and the inclined drilling arrangement. Firstly, a mining model of 8210 working face is established by FLAC3D simulation software. Through analyzing the plastic deformation, movement displacement and redistribution of the overlying strata after excavation of the working face, the distribution of the fracture field and the position of the pressure relief gas migration channel are finally obtained. According to the simulation results, the main occurrence of tensile failure within 40m above the top plate is mainly shear failure within 50-70m; the gradient of the internal stress of the overlying rock above the top plate 50m of the working surface is obviously reduced, and the sinking displacement suddenly decreases abruptly, and the stress relief value of the overlying rock above the top plate 70m is less than 20%. The displacement amount of subsidence is close to 0; the horizontal displacement difference is the largest in the range of 25-35m in the horizontal direction, and the variation of horizontal stress is also the largest, indicating that this area is in the longitudinal fissure development zone. Therefore, the comprehensive analysis shows that the vertical distance of the fissure gas enrichment channel is 50-70m and the horizontal distance is 25-35m. and (2) according to the distribution result of the rock-covered fracture of the working face, establishing a rock-clad fracture pressure-relief gas extraction model, and simulating the extraction effect and the extraction range of the gas extraction and the gas extraction for the high-pressure-pumping lane and the inclined borehole. First of all, using COMSOL software to build 8210 working face overburden pressure-relief gas extraction model, and according to the distribution of fracture distribution in the overlying rock and the gas emission source item, the porosity and gas flux of each source item are set, and the gas pressure cloud picture in the overlying rock before and after pumping is compared and analyzed. After 40 days of pumping, In the vertical direction, the gas pressure in the gas crack channel is reduced from 2MPa to 0.6Mpa, and the gas pressure in the horizontal direction 26m is reduced to 0. 74MPa, and the gas pressure at the periphery of the single inclined borehole is 7. 5m, and the gas pressure is reduced from 2MPa to 0.74MPa. According to the definition of effective extraction radius of borehole, it is known that the effective pumping radius of the borehole is 7.5m. (3) According to the effect of gas extraction and extraction and extraction range of the simulated overburden pressure relief, the design 8210 working face overburden is designed to move towards the high suction lane and the inclined borehole layout parameters. and the inclined drilling drilling field is arranged in the high suction lane arranged in the adjacent preparation working face, a drilling field is arranged every 30m, 9 drilling holes are arranged in each drilling field, Each drilling orifice is located at a distance of 0. 5m, the final hole is 13m, and the drilling length is 100m2/ 120m. (4) combining the simulation results and the design parameters of the 8210 working face overlying rock toward the high suction lane, calculating the gas extraction effect of the working face after the prediction is arranged towards the high suction lane and the inclined hole, and predicting that: The gas content in the effective pumping range from 18. 69m3/ m3 to 3.37m3/ m3 and the reduction of 82% in the effective pumping range of the high suction lane and the inclined borehole. The gas extraction capacity for the unit time of the high pumping lane is 40. 78m3/ min. The gas extraction capacity of the inclined drilling unit is 27,58m3/ min, and the drilling gas extraction capacity of the inclined drilling unit is 66.7% of the direction to the high suction lane. According to the gas emission amount in the working face, the gas extraction rate of the working face is 47. 8%, and the gas extraction rate of the working face is increased from 47. 8% to 77.9%, and the gas extraction is up to the standard.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712.6

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉冠學(xué),唐永志,許培德,甘林堂;謝二礦高抽巷布置及使用效果分析[J];礦業(yè)安全與環(huán)保;2000年04期

2 馬其祥,徐廷奎,肖大鵬;大灣煤礦高抽巷最佳層位選擇[J];礦業(yè)安全與環(huán)保;2004年S1期

3 李青柏;;高抽巷的聯(lián)合設(shè)計及應(yīng)用[J];科技信息;2010年23期

4 王成;;頂板瓦斯高抽巷合理抽放負(fù)壓數(shù)值模擬研究[J];工業(yè)安全與環(huán)保;2011年01期

5 吳同性;趙保清;李超亞;;耿村煤礦高抽巷合理層位布置研究[J];中州煤炭;2013年03期

6 李歡;趙志軍;;耿村煤礦高抽巷氣體異常變化規(guī)律及三帶范圍研究[J];煤炭工程;2013年03期

7 馬洪芬;平太保;毛桃良;;高抽巷技術(shù)在黃巖匯煤礦的應(yīng)用研究[J];山西焦煤科技;2013年06期

8 程攀;;走向高抽巷合理層位確定的數(shù)值模擬[J];煤炭技術(shù);2014年03期

9 王旭宏,趙長春;傾向高抽巷在陽泉五礦綜放工作面的應(yīng)用[J];河北煤炭;2004年06期

10 邵廣印;;謝橋礦綜采面高抽巷布置層位探討[J];煤炭技術(shù);2008年01期

相關(guān)會議論文 前8條

1 黃文忠;周海軍;張志強(qiáng);劉東興;;建新礦1010高抽巷抽放試驗分析[A];江西省煤炭工業(yè)協(xié)會、江西省煤炭學(xué)會——2005年工作暨學(xué)術(shù)年會學(xué)術(shù)論文集[C];2005年

2 郝世俊;孫榮軍;周新莉;;大直徑拐彎鉆孔替代傾斜高抽巷抽放瓦斯的可行性研究[A];第十三屆全國探礦工程（巖土鉆掘工程）學(xué)術(shù)研討會論文專輯[C];2005年

3 原德勝;何建華;;巖石高抽巷在高瓦斯易自燃煤層綜采面的實踐[A];安全高效礦井建設(shè)與開采技術(shù)——陜西省煤炭學(xué)會學(xué)術(shù)年會論文集(2010)[C];2010年

4 鄧福保;黃文忠;周海軍;胡菊印;張志強(qiáng);劉東興;;建新礦1010高抽巷抽放瓦斯實踐[A];江西省煤炭工業(yè)協(xié)會、江西省煤炭學(xué)會第九次優(yōu)秀論文評選[C];2006年

5 郭有慧;屈慶棟;;后偽高抽巷治理綜采放頂煤工作面初采瓦斯[A];瓦斯地質(zhì)與瓦斯防治進(jìn)展[C];2007年

6 賈天讓;薛明理;史小衛(wèi);;煤層頂板高抽巷瓦斯抽放技術(shù)在“三軟”厚煤層綜放工作面的應(yīng)用[A];瓦斯地質(zhì)理論與實踐——中國煤炭學(xué)會瓦斯地質(zhì)專業(yè)委員會第五次全國瓦斯地質(zhì)學(xué)術(shù)研討會論文集[C];2005年

7 王懷新;;煤層頂板高抽巷瓦斯抽放技術(shù)在“三軟”不穩(wěn)定厚煤層綜放工作面的應(yīng)用[A];瓦斯地質(zhì)理論與實踐——中國煤炭學(xué)會瓦斯地質(zhì)專業(yè)委員會第五次全國瓦斯地質(zhì)學(xué)術(shù)研討會論文集[C];2005年

8 萬火金;;采用高抽巷解決回采工作面瓦斯超限[A];江西省煤炭工業(yè)協(xié)會、江西省煤炭學(xué)會第九次優(yōu)秀論文評選[C];2006年

相關(guān)重要報紙文章 前1條

1 陳開云;攻克國內(nèi)第一口地面瓦斯高抽巷鉆孔[N];中煤地質(zhì)報;2007年

相關(guān)碩士學(xué)位論文 前10條

1 劉明信;王莊礦9101工作面高抽巷瓦斯抽采技術(shù)研究[D];河南理工大學(xué);2015年

2 陳偉;胡家河礦高抽巷瓦斯抽采數(shù)值模擬研究[D];西安科技大學(xué);2015年

3 郭召順;亭南煤礦205工作面頂板高抽巷層位優(yōu)選研究[D];西安科技大學(xué);2015年

4 杜政賢;外錯高抽巷上行鉆孔卸壓瓦斯抽采技術(shù)研究[D];西安科技大學(xué);2016年

5 婁金福;頂板瓦斯高抽巷采動變形機(jī)理及優(yōu)化布置研究[D];中國礦業(yè)大學(xué);2008年

6 馬衛(wèi)波;余吾煤業(yè)頂板高抽巷合理布置與支護(hù)技術(shù)研究[D];中國礦業(yè)大學(xué);2014年

7 高佳佳;大采高工作面頂板走向高抽巷合理層位研究[D];河南理工大學(xué);2014年

8 王春橋;大佛寺礦走向高抽巷瓦斯抽采參數(shù)優(yōu)化研究[D];西安科技大學(xué);2013年

9 葛偉偉;大采高傾斜長壁綜采面頂板傾斜高抽巷合理位置研究[D];安徽理工大學(xué);2015年

10 王林;銅川焦坪礦區(qū)頂板走向高抽巷合理層位研究[D];河南理工大學(xué);2009年

，

本文編號：2286697