不同瓦斯压力和孔隙率的原煤电阻率和渗透率变化规律研究

发布时间：2018-04-21 16:22

本文选题：瓦斯压力 + 孔隙率　；参考：《中国安全生产科学技术》2017年04期

【摘要】：为了解不同瓦斯压力和孔隙率下原煤的电阻率和渗透率变化及电阻率和渗透率的响应规律,以淮南矿区谢一矿51采区C15煤层煤体为研究对象,研究不同瓦斯压力和孔隙率下煤样三轴压缩全过程的电阻率与渗透率的变化规律。研究结果表明:孔隙率相同时,最小电阻率和最小渗透率随着瓦斯压力的增大先增加后减小,瓦斯压力在4 MPa时,最小渗透率基本为0;瓦斯压力相同时,最小电阻率和最小渗透率随着孔隙率的增大而增大;全应力应变过程电阻率和渗透率满足随应变的增大先减小后增大的规律,不同加载阶段电阻率变化和渗透率变化规律保持一致,渗透率变化幅度比-应变曲线拐点滞后于电阻率变化幅度比-应变曲线;可利用电阻率变化规律反映应力变化以及渗透率变化情况。
[Abstract]:In order to understand the change of resistivity and permeability of raw coal under different gas pressure and porosity, and the response law of resistivity and permeability, the coal body of coal seam C15 in No. 51 mining area of Xieyi Mine in Huainan mining area was taken as the research object. The variation of resistivity and permeability of coal samples during triaxial compression under different gas pressure and porosity is studied. The results show that with the same porosity, the minimum resistivity and minimum permeability increase first and then decrease with the increase of gas pressure, the minimum permeability is basically 0 when the gas pressure is 4 MPa, and when the gas pressure is the same, The minimum resistivity and minimum permeability increase with the increase of porosity, and the resistivity and permeability of the whole stress-strain process decrease first and then increase with the increase of strain. The variation of resistivity and permeability is consistent at different loading stages, and the inflection point of permeability ratio strain curve lags behind that of resistivity change amplitude ratio strain curve. The change of stress and permeability can be reflected by the law of resistivity change.
【作者单位】：安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室;安徽理工大学能源与安全学院;
【基金】：国家自然科学基金项目(U1361208)
【分类号】：X936

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