引用本文:田坤云, 李晓丽.低渗煤体渗透特性对其加载轴(围)压变化响应特征试验研究[J].西南大学学报(自然科学版),2019,41(2):135~140
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低渗煤体渗透特性对其加载轴(围)压变化响应特征试验研究
田坤云, 李晓丽1,2
1. 河南工程学院 安全工程学院, 郑州 451191;2. 郑州工业技师学院, 郑州 451150
摘要:
针对低渗透煤体在轴压及围压变化作用下的渗透率演化规律,利用自主研发的全应力-应变三轴伺服控温渗流试验系统,进行了变围压及变轴压条件下煤样渗透率的试验研究.试验结果表明:(1)渗透率在轴压及围压变化过程中减小,围压对渗透率影响高于轴压对渗透率的影响;(2)围压与渗透率符合K=αe-0.45σ2关系式,拟合系数α随着轴压的升高呈依次降低的趋势;(3)轴压、围压均为1~10 MPa的范围内时,两者和渗透率之间满足K=15.335 89e-0.45σ2-0.276 43σ1e-0.45σ2的函数关系.研究结果为采动条件下渗透率演化提供理论参考依据,对现场瓦斯抽放钻孔布置具有一定的实践指导意义.
关键词:  轴压  围压  试验研究  瓦斯  渗透率
DOI:10.13718/j.cnki.xdzk.2019.02.018
分类号:X936
基金项目:国家自然科学基金项目(51604091);河南省高等学校青年骨干教师项目(2017GGJS153).
An Experimental Study on the Response of Seepage Characteristics of Low Permeability Coal to Its Loading Axis/Confining Pressure
TIAN Kun-yun, LI Xiao-li1,2
1. Department of Safety Science & Engineering, Henan University of Engineering, Zhengzhou 451191, China;2. Zhengzhou Industry Technicians College, Zhengzhou 451150, China
Abstract:
In order to understand the laws of permeability variation of low permeable coal samples under changing axle loads and confining pressures, an experimental research was conducted on coal permeability under different confining pressures and axle loads using a self-developed resultant stress-strain triaxial seepage test system based on servo temperature control. The test results demonstrated that permeability decreased with changes in axle load and confining pressure, but confining pressure exerted greater effects on permeability than axle load; that the relation of confining pressure to permeability could be expressed as K=αe-0.45σ2, where the fitting coefficient a decreased steadily as the axle load increased; and when the axle load and the confining pressure were within the range of 1~10 MPa, their relation to permeability could be written as K=15.335 89e-0.45σ2-0.276 43σ1e-0.45σ2. These results are expected to lay a theoretical basis for the evolution of permeability during mining.
Key words:  axis pressure  confining pressure  experimental research  gas  permeability
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