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Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures

不同围压和温度下粉砂质粉质泥岩裂隙的渗流特性

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Abstract

To investigate the influence of confining pressures and temperatures on the seepage characteristics of fractured rocks, seepage tests were conducted on a fractured silty mudstone using a self-developed experimental system, and the effects of different factors on coefficient of permeability were discussed. The results showed that the increasing confining pressure will gradually decrease the coefficient of permeability, and this process is divided into two stages: 1) the fast decrease stage, which corresponds to a confining pressure less than 30 kPa, and 2) the slow decrease stage, which corresponds to a confining pressure larger than 30 kPa. Unlike confining pressure, an increase in temperature will increase the coefficient of permeability. It is noted that fracture surface roughness will also affect the variation of coefficient of permeability to a certain extent. Among the three examined factors, the effect of confining pressure increases is dominant on fracture permeability coefficient. The relationship between the confining pressure and coefficient of permeability can be quantified by an exponential function.

摘要

为研究围压和温度对粉砂质泥岩裂隙渗流特性的影响,采用自行研发的裂隙渗流实验系统对裂 隙粉质泥岩进行渗流试验,探讨了不同因素对渗透系数的影响。结果表明:围压的增大会导致渗透系 数逐渐减小,该过程分为快速减小和缓慢减小两个阶段。其中,快速减小阶段对应的围压小于30 kPa; 缓慢降低阶段对应的稳压则大于30 kPa。温度对裂隙渗透系数的影响与围压不同,温度升高将导致渗 透系数增加。此外,裂隙面粗糙度也在一定程度上影响渗透系数的变化,但这种变化受到围压的影响 较大,当围压大于50 kPa 时,这种影响逐渐消失。可以看出,在以上三种因素中,围压的变化是影响 裂缝渗透系数改变的主要因素,且围压和裂隙渗透系数之间的关系可以通过指数函数来量化

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Authors and Affiliations

  1. School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha, 410114, China

    Hong-yuan Fu  (付宏渊) & Huang-bin Jiang  (蒋煌斌)

  2. School of Civil Engineering, Changsha University of Science & Technology, Changsha, 410114, China

    **ang Qiu  (邱祥), Yun-peng Ji  (姬云鹏) & Ling Zeng  (曾铃)

  3. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, Université de Lorraine, Metz, 57070, France

    Wen Chen  (陈文)

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  1. Hong-yuan Fu  (付宏渊)
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  4. Yun-peng Ji  (姬云鹏)
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  6. Ling Zeng  (曾铃)
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Correspondence to Ling Zeng  (曾铃).

Additional information

Foundation item: Projects(51838001, 51878070, 51908073, 51908069) supported by the National Natural Science Foundation of China; Project(2019SK2171) supported by the Key Research and Development Program of Hunan Province, China; Project(kq1905043) supported by the Training Program for Excellent Young Innovators of Changsha, China; Project(2019IC04) supported by Double First-class Scientific Research International Cooperation Expansion Project of Changsha University of Science & Technology, China; Project(CX20200811) supported by Postgraduate Research and Innovation Key Project of Hunan Province, China.

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Fu, Hy., Jiang, Hb., Qiu, X. et al. Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures. J. Cent. South Univ. 27, 1907–1916 (2020). https://doi.org/10.1007/s11771-020-4419-6

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  • DOI: https://doi.org/10.1007/s11771-020-4419-6

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