本文選題：煤 + 有效應(yīng)力��； 參考：《中國(guó)礦業(yè)》2017年06期

【摘要】：為探索煤中孔隙流體壓力的變化導(dǎo)致滲透率的改變,引發(fā)煤滲透率壓力敏感性現(xiàn)象,利用自主研發(fā)的出口端壓力可調(diào)的三軸滲流裝置,對(duì)貴州3個(gè)礦區(qū)的煤開展不同吸附性氣體與不同氣體壓力下煤的敏感性試驗(yàn)研究。研究結(jié)果表明:在較低氣壓范圍內(nèi)(0~0.6 MPa),隨氣體壓力的增加,煤滲透率下降明顯,當(dāng)氣體壓力繼續(xù)上升煤的吸附作用逐漸趨于平衡,煤體骨架的吸附膨脹變形也越來越小,滲透率的下降速率逐漸減少并趨于平緩。在氣體壓力小于1.0 MPa時(shí),煤滲透率損害率Dp變化較大,且隨氣體壓力增加快速增大,表現(xiàn)出較強(qiáng)的壓力敏感性。不同吸附性氣體條件下,氣體壓力指數(shù)關(guān)系敏感系數(shù)Cp均隨氣體壓力的增加而逐漸減小,煤滲透率對(duì)氣體壓力的敏感性降低。對(duì)于同一煤,在相同的條件下,CH4的氣體壓力乘冪關(guān)系敏感系數(shù)Sp的值最小,煤對(duì)氣壓的敏感性越差。乘冪關(guān)系的氣體壓力敏感系數(shù)Sp與滲透率損害率Dp有很好的線性相關(guān)性。
[Abstract]:In order to explore the permeability change caused by the change of pore fluid pressure in coal and the phenomenon of coal permeability pressure sensitivity, a triaxial percolation device with adjustable outlet pressure was developed.The sensitivity of coal under different adsorptive gases and different gas pressures was studied in 3 mining areas of Guizhou province.The results show that in the low pressure range, the coal permeability decreases obviously with the increase of gas pressure, and when the gas pressure continues to rise, the adsorption and expansion deformation of the coal skeleton becomes smaller and smaller.The rate of decrease in permeability gradually decreases and tends to level off.When the gas pressure is less than 1.0 MPa, the coal permeability damage rate DP changes greatly, and increases rapidly with the increase of gas pressure, showing a strong pressure sensitivity.Under different adsorptive gas conditions, the sensitivity coefficient of gas pressure exponent (CP) decreases with the increase of gas pressure, and the sensitivity of coal permeability to gas pressure decreases.For the same coal, the sensitivity coefficient Sp of the gas pressure power relation of Ch _ 4 is the smallest under the same conditions, and the sensitivity of the coal to the pressure is worse.There is a good linear correlation between the gas pressure sensitivity coefficient (Sp) and permeability damage rate (DP).
【作者單位】： 貴州大學(xué)礦業(yè)學(xué)院;貴州大學(xué)喀斯特山區(qū)優(yōu)勢(shì)礦產(chǎn)資源高效利用國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室;貴州省非金屬礦產(chǎn)資源綜合利用重點(diǎn)實(shí)驗(yàn)室;國(guó)家電力投資集團(tuán)公司貴州遵義產(chǎn)業(yè)發(fā)展有限公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目資助(編號(hào):51574093) 貴州省科學(xué)技術(shù)基金項(xiàng)目資助(編號(hào):黔科合J字[2015]2049號(hào)) 貴州省科技廳、貴州大學(xué)聯(lián)合資金計(jì)劃項(xiàng)目資助(編號(hào):黔科合LH字[2014]7654) 貴州大學(xué)引進(jìn)人才科研項(xiàng)目資助(編號(hào):貴大人基合字[2014]57號(hào))
【分類號(hào)】：TD712

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本文編號(hào)：1731759