【摘要】：在煤礦開采過程中,瓦斯一向是威脅煤礦安全生產(chǎn)的主要災(zāi)害之一。目前,礦井瓦斯抽采為防治煤與瓦斯突出最重要的舉措。然而,不斷增加的煤層開采深度,給瓦斯抽采工作帶來了新的難題。開采深度的增加,致使煤層瓦斯含量和壓力增大,煤層透氣性急劇降低,瓦斯抽采效果嚴(yán)重受到影響。因此,實現(xiàn)煤礦安全高效生產(chǎn)的重要手段就是提高煤層的透氣性。 本文通過理論探討、數(shù)值模擬結(jié)合現(xiàn)場試驗的方法,對低透氣性高瓦斯煤層深孔預(yù)裂爆破卸壓增透效應(yīng)機理進(jìn)行了研究。首先分析了煤體瓦斯賦存及其流動理論；其次探討了深孔預(yù)裂爆破卸壓增透的作用機理,得出了炸藥爆炸后,在爆破孔周圍煤體中產(chǎn)生了相互貫通的交叉裂隙網(wǎng)；且在裂隙擴(kuò)展過程中,爆轟應(yīng)力波、爆生氣體起主要作用,控制孔提供了輔助自由面,煤體瓦斯壓力進(jìn)一步促進(jìn)了煤體裂隙的擴(kuò)展。研究表明深孔預(yù)裂爆破使得煤體裂隙增加,透氣性增大,有效地預(yù)防和消除了煤與瓦斯突出的危險。同時,建立了煤層深孔預(yù)裂爆破卸壓增透的數(shù)學(xué)模型,并利用ANSYS/LS-DYNA軟件,模擬了不同時刻煤體的應(yīng)力分布和裂隙擴(kuò)展。兩爆破孔距離6-7m,爆破后,可以產(chǎn)生大量的貫通裂隙,進(jìn)而形成裂隙網(wǎng),使煤體的透氣性大大增加。最后,通過潘一東礦11-2煤1252(1)軌順底板巷的現(xiàn)場工業(yè)試驗研究表明：深孔預(yù)裂爆破卸壓增透效果明顯,有效卸壓半徑可達(dá)4m,瓦斯抽采量和抽采率有很大的提高,具有重要的社會價值和經(jīng)濟(jì)效益。
[Abstract]:In the process of coal mining, gas has always been one of the main disasters threatening the safety of coal production. At present, gas drainage is the most important measure to prevent coal and gas outburst. However, the increasing coal seam mining depth has brought new problems to the gas drainage work. With the increase of mining depth, the gas content and pressure of coal seam increase, the permeability of coal seam decreases sharply, and the effect of gas extraction is seriously affected. Therefore, the important means to realize coal mine safe and efficient production is to improve the permeability of coal seam. In this paper, the mechanism of pressure-relief and antireflection effect of deep-hole pre-split blasting in low permeability and high gas seam is studied by means of theoretical discussion and numerical simulation combined with field test. Firstly, the occurrence of coal gas and its flow theory are analyzed, then the mechanism of pressure-relief and antireflection in deep-hole pre-splitting blasting is discussed, and it is concluded that after explosive explosion, the intersecting cross fissure network is produced in the coal body around the blasting hole. In the process of crack expansion, detonation stress wave, detonation gas plays a major role, the control hole provides the auxiliary free surface, and the gas pressure of coal body further promotes the expansion of coal fracture. The study shows that the deep-hole pre-splitting blasting can increase the coal fissure and increase the gas permeability, which can effectively prevent and eliminate the danger of coal and gas outburst. At the same time, the mathematical model of pressure-relief and anti-reflection of deep-hole pre-splitting blasting in coal seam is established, and the stress distribution and crack propagation of coal body at different times are simulated by ANSYS/LS-DYNA software. The distance between two blasting holes is 6-7m. after blasting, a large number of perforated cracks can be produced, and then a fissure network is formed, which greatly increases the permeability of coal body. Finally, the field industrial test of 11-2 coal 1252 (1) in Panyidong Coal Mine shows that the pressure relief effect of deep-hole pre-splitting blasting is obvious, the effective pressure relief radius can reach 4 m, and the gas extraction rate and extraction rate are greatly improved. It has important social value and economic benefit.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD712.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張大林，張飛，劉占魁;爆破對巖體節(jié)理裂隙的影響[J];包頭鋼鐵學(xué)院學(xué)報;1999年01期

2 盧文波，陶振宇;爆生氣體驅(qū)動的裂紋擴(kuò)展速度研究[J];爆炸與沖擊;1994年03期

3 林柏泉;深孔控制卸壓爆破及其防突作用機理的實驗研究[J];阜新礦業(yè)學(xué)院學(xué)報(自然科學(xué)版);1995年03期

4 郭文章,馮順山,王樹仁,陳壽峰;節(jié)理巖體爆破研究進(jìn)展[J];工程爆破;1999年04期

5 劉澤功;張春華;劉健;蔡峰;李連崇;;低透氣煤層預(yù)裂瓦斯運移數(shù)值模擬及抽采試驗[J];安徽理工大學(xué)學(xué)報(自然科學(xué)版);2009年04期

6 溫興欽;松動爆破在井巷掘進(jìn)中的應(yīng)用[J];金屬礦山;1999年10期

7 潘井瀾，梁偉東;預(yù)裂爆破技術(shù)的發(fā)展[J];金屬礦山;1996年09期

8 林柏泉,何學(xué)秋,王佳新;氣體吸附性與煤和瓦斯突出的機理[J];江蘇煤炭;1990年02期

9 James R.Rice,郭高峰;裂紋和斷層動力學(xué)的新進(jìn)展[J];力學(xué)進(jìn)展;2001年03期

10 徐金平;;松動爆破技術(shù)在綜采面防治瓦斯上的運用[J];煤;2006年05期

相關(guān)博士學(xué)位論文 前3條

1 劉健;低透氣煤層深孔預(yù)裂爆破增透技術(shù)研究及應(yīng)用[D];安徽理工大學(xué);2008年

2 周紅星;突出煤層穿層鉆孔誘導(dǎo)噴孔孔群增透機理及其在瓦斯抽采中的應(yīng)用[D];中國礦業(yè)大學(xué);2009年

3 蔡峰;高瓦斯低透氣性煤層深孔預(yù)裂爆破強化增透效應(yīng)研究[D];安徽理工大學(xué);2009年

，

本文編號：2233288