【摘要】：為了探討滑脫效應(yīng)和基質(zhì)變形對(duì)低滲透煤體滲流特性的影響,以渝陽(yáng)煤礦8#煤層原煤試件為研究對(duì)象,進(jìn)行4種氣體在不同壓力條件下的滲流平行試驗(yàn)。試驗(yàn)結(jié)果表明:當(dāng)軸壓、圍壓和氣體壓力恒定時(shí),滑脫效應(yīng)滲透率表現(xiàn)為,△K_(He,b)△K_(CH_4,b)△K_(N_2,b)△K_(CO_2,b);基質(zhì)變形滲透率表現(xiàn)為煤體對(duì)氣體的吸附性越強(qiáng),產(chǎn)生的基質(zhì)變形滲透率越大,試驗(yàn)結(jié)果為△K_(He,s)△K_(N_2,s)△K_(CH_4,s)△K_(CO_2,s);在軸壓和圍壓一定條件下,滑脫效應(yīng)滲透率、基質(zhì)變形滲透率和有效滲透率均隨氣體壓力的增大呈非線性變化。滑脫效應(yīng)滲透率與氣體壓力關(guān)系式可表示為△Ki,b=ap~b;基質(zhì)變形滲透率隨氣體壓力的增加呈二次函數(shù)關(guān)系增大,即△K_(i,s)=ap~2+bp+c;有效滲透率隨著氣體壓力的增加呈現(xiàn)出先減小后增大現(xiàn)象,具有明顯的滑脫效應(yīng),且二者之間變化關(guān)系符合二次函數(shù)關(guān)系,即△K_(i,g)=ap~b+bp+c。
[Abstract]:In order to investigate the influence of slippage effect and matrix deformation on the seepage characteristics of low permeability coal body, the seepage parallel tests of four kinds of gases under different pressure conditions were carried out with the raw coal specimen of No. 8 coal seam in Yuyang Coal Mine as the research object. The experimental results show that when the axial pressure, confining pressure and gas pressure are constant, the slippage effect permeability is K _ (He,b) K _ (CH_4,b) K _ (N 鈮，

本文編號(hào)：2477032