本文選題：數(shù)值模擬 + 穿層鉆孔�。� 參考：《煤炭科學(xué)研究總院》2017年碩士論文

【摘要】：作為煤礦安全開采當(dāng)中的主要災(zāi)害之一,瓦斯災(zāi)害一直被人們所重視。目前,在防止瓦斯災(zāi)害方面,煤層瓦斯的預(yù)抽是防治煤和瓦斯突出以及井下瓦斯超標(biāo)的關(guān)鍵手段。為保證質(zhì)量,科學(xué)分配鉆孔彼此距離和預(yù)抽時(shí)間較為關(guān)鍵,但設(shè)計(jì)鉆孔彼此距離的關(guān)鍵是抽采半徑值。抽采半徑又受到種種影響因素的制約,所以,怎樣迅速、合理、精準(zhǔn)的評(píng)價(jià)鉆孔半徑對(duì)抽采規(guī)劃階段而言存在巨大價(jià)值,對(duì)保證煤礦的安全生產(chǎn)具有非常重要的意義。本文利用理論分析,數(shù)值模擬和現(xiàn)場測試的方法,對(duì)鉆孔抽采有效半徑與抽采時(shí)間等之間的規(guī)律進(jìn)行了研究。結(jié)合實(shí)驗(yàn)室對(duì)邯鄲峰峰羊東礦2#煤層測定的瓦斯基本參數(shù),運(yùn)用滲流力學(xué)等理論推導(dǎo)了瓦斯抽采有效半徑與抽采時(shí)間之間相互影響的耦合數(shù)學(xué)模型,借助COMSOLMultiphysics軟件,得出瓦斯抽采半徑與時(shí)間彼此的幾何曲線,最終明確瓦斯抽采半徑的具體數(shù)值。以邯鄲峰峰羊東礦2#煤層為試驗(yàn)點(diǎn),根據(jù)《煤礦瓦斯抽采達(dá)標(biāo)暫行規(guī)定》的要求,利用瓦斯壓力降低法和SF6氣體示蹤法對(duì)該煤層Φ94mm、Φ113mm、Φ133mm穿層鉆孔和順層鉆孔抽采半徑進(jìn)行實(shí)際考察,并對(duì)實(shí)測的數(shù)據(jù)進(jìn)行了分析研究。研究表明:隨著抽采時(shí)間的增加,鉆孔周圍的煤層瓦斯壓力以鉆孔為中心,從抽采壓力開始逐漸上升,抽采時(shí)間越長,煤層中瓦斯壓力影響的范圍就越大;距鉆孔距離越近,瓦斯壓力梯度越大,相反距鉆孔距離越大,瓦斯壓力梯度就越小,逐漸接近零,瓦斯壓力上升到原始瓦斯壓力,最終形成一個(gè)抽采的"瓦斯壓力漏斗";在抽采時(shí)間沒有變化的基礎(chǔ)上,距鉆孔間距越近,其滲流速度越高;相反距鉆孔越遠(yuǎn),其滲流速度越小,伴隨抽采工作時(shí)間的持續(xù)提升,其滲流速度也不斷降低,最終逐漸接近靜止;抽采半徑伴隨滲透率的不斷提升而提升,伴隨滲透率的提升,瓦斯的抽采有效半徑隨著抽采時(shí)間的延長而增大。對(duì)于邯鄲峰峰羊東礦2#煤層穿層鉆孔和順層鉆孔,在考察范圍(Φ94mm-Φ133mm)內(nèi)抽采半徑與鉆孔直徑有一定的關(guān)系,鉆孔直徑越大,有效抽采半徑隨之增大,隨著抽采時(shí)間的延長,鉆孔直徑對(duì)有效抽采半徑影響變大。
[Abstract]:As one of the main disasters in the safe mining of coal mine, gas disaster has been paid attention by people all the time. At present, in the aspect of preventing gas disaster, the pre-drainage of coal seam gas is the key means to prevent coal and gas outburst and underground gas exceeding the standard. In order to ensure the quality, the scientific allocation of the distance between the boreholes and the pre-drawing time is more critical, but the key to design the distance between the boreholes is the extraction radius value. The extraction radius is restricted by various factors, so how to evaluate the drilling radius quickly, reasonably and accurately is of great value to the planning stage of extraction and mining, and it is of great significance to ensure the safety of coal mine production. By means of theoretical analysis, numerical simulation and field test, the law between effective radius and extraction time of borehole extraction is studied in this paper. Combined with the basic parameters of gas measured in coal seam of Fengfeng Yangdong Mine in Handan, the coupling mathematical model of the interaction between the effective radius of gas extraction and the extraction time is deduced by using the theory of seepage mechanics, and the coupling mathematical model is developed by means of COMSOLMultiphysics software. The geometric curves of gas extraction radius and time are obtained, and the specific value of gas drainage radius is finally determined. Taking coal seam of Fengfeng Yangdong Mine in Handan as the test point, according to the requirement of coal mine gas extraction reaching the standard, using gas pressure reduction method and SF6 gas tracer method, actual investigation is carried out on the drilling radius of 桅 94mm, 桅 113mm, 桅 133mm borehole and bedding borehole in Handan coal seam. The measured data are analyzed and studied. The study shows that with the increase of drainage time, the gas pressure around the borehole is centered on the borehole, and gradually rises from the drainage pressure. The longer the extraction time is, the larger the influence of gas pressure in coal seam is, and the closer the distance from the borehole to the borehole, the greater the influence of the gas pressure in the coal seam. The bigger the gas pressure gradient is, the greater the distance from borehole is, and the smaller the gas pressure gradient is, the closer the gas pressure gradient is to zero, and the gas pressure is rising to the original gas pressure. Finally, a "gas pressure funnel" is formed. On the basis of no change in extraction time, the closer the distance from the borehole, the higher the percolation velocity; on the contrary, the farther away from the borehole, the smaller the percolation velocity, which is accompanied by the continuous improvement of the extraction time. The percolation velocity is also decreasing and finally approaching to rest gradually; the extraction radius increases with the increase of permeability, and with the increase of permeability, the effective radius of gas extraction increases with the prolongation of extraction time. For the boreholes of coal seam passing through the seam and the boreholes in the shun bed of Fengfeng Yangdong Coal Mine in Handan, the extraction radius and the diameter of the borehole in the investigation range (桅 94mm- 桅 133mm) are related to the diameter of the borehole. The larger the diameter of the borehole is, the more the effective extraction radius increases, and with the prolongation of the extraction time, The influence of borehole diameter on effective extraction radius becomes larger.
【學(xué)位授予單位】：煤炭科學(xué)研究總院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712.6

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 丁文通;;鉆孔抽采有效半徑影響因素分析[J];山東煤炭科技;2014年03期

2 康天慧;;寺家莊礦15~#煤層超前排放孔有效半徑考察[J];能源技術(shù)與管理;2014年04期

3 王偉有;汪虎;;基于COMSOL Multiphysics的瓦斯抽采有效半徑數(shù)值模擬[J];礦業(yè)工程研究;2012年02期

4 盧平;排放鉆孔有效半徑的簡易確定方法[J];東北煤炭技術(shù);1996年02期

5 傅正民;高溫狀態(tài)下的離子有效半徑[J];科學(xué)通報(bào);1997年07期

6 全志利,閆家偉,張潔,榮剛;CNG供氣有效半徑的研究[J];煤氣與熱力;2005年06期

7 梁光躍;廖新維;萬光芬;廖紅梅;;非牛頓冪律流體試井模型的有效半徑解及其曲線特征[J];科技導(dǎo)報(bào);2010年13期

8 郝天軒;宋超;;數(shù)值模擬結(jié)合SF_6示蹤法確定煤層鉆孔瓦斯抽采有效半徑[J];中國安全科學(xué)學(xué)報(bào);2013年01期

9 劉三鈞;馬耕;盧杰;林柏泉;;基于瓦斯含量的相對(duì)壓力測定有效半徑技術(shù)[J];煤炭學(xué)報(bào);2011年10期

10 蔣靜宇;程遠(yuǎn)平;王亮;尚政杰;楊云;;超前鉆孔有效排放半徑測定方法探討[J];能源技術(shù)與管理;2009年04期

相關(guān)會(huì)議論文 前1條

1 王偉有;汪虎;;基于COMSOL的鉆孔抽采有效半徑的數(shù)值模擬[A];煤礦瓦斯地質(zhì)與抽采利用研究——陜西省煤炭學(xué)會(huì)學(xué)術(shù)年會(huì)論文集（2012）[C];2012年

相關(guān)碩士學(xué)位論文 前2條

1 牛帥;煤體瓦斯運(yùn)移多場耦合分析及應(yīng)用[D];河南理工大學(xué);2015年

2 宋超;計(jì)算機(jī)模擬輔助SF_6氣體示蹤法測定鉆孔抽采有效半徑研究[D];河南理工大學(xué);2012年

，

本文編號(hào)：1928825