【摘要】：利用自行設(shè)計(jì)改裝的煤巖體三軸滲流儀以低滲透性松軟構(gòu)造原煤體試件為研究對象進(jìn)行實(shí)驗(yàn),研究了抽采負(fù)壓作用下松軟構(gòu)造煤體中瓦斯?jié)B流規(guī)律。實(shí)驗(yàn)結(jié)果表明:靜態(tài)加載過程中圍壓、軸壓、進(jìn)口瓦斯壓力保持恒定的條件下瓦斯?jié)B透率隨著抽采負(fù)壓的增大而增大,負(fù)壓較高時(shí),煤體瓦斯?jié)B透率增幅較小,負(fù)壓為30 kPa時(shí),滲透率的增幅已趨于0;改變加載軸壓、圍壓及瓦斯進(jìn)氣口壓力,比較不同組別之間的差異性發(fā)現(xiàn),隨著加載軸壓和圍壓的增大,構(gòu)造煤瓦斯?jié)B透率一直在降低,提高進(jìn)氣口瓦斯壓力及出口抽采負(fù)壓則有利于提高滲透率,但總體增幅較小。
[Abstract]:By using the self-designed and modified triaxial seepage instrument of coal and rock mass, the gas seepage law in soft structure coal body with low permeability and soft structure is studied by using the triaxial seepage instrument designed and modified by ourselves, and the gas seepage law in soft structure coal body under the action of suction negative pressure is studied. The experimental results show that the gas permeability increases with the increase of negative pressure during static loading under the condition that the pressure of confining pressure, axial pressure and inlet gas pressure is constant. When the negative pressure is high, the increase of gas permeability of coal body is small, and the negative pressure is 30 kPa. The increase of permeability has tended to 0; Changing the loading axial pressure, confining pressure and gas inlet pressure, and comparing the differences among different groups, it is found that with the increase of loading axial pressure and confining pressure, the permeability of structural coal gas has been decreasing. Increasing the gas pressure at the inlet and the negative pressure at the outlet are beneficial to improve the permeability, but the overall increase is small.
【作者單位】： 重慶水利水電職業(yè)技術(shù)學(xué)院;河南理工大學(xué)安全科學(xué)與工程學(xué)院;
【分類號(hào)】：TD712
，

本文編號(hào)：2479732