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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures
FU Hong-yuan(付宏渊)1, JIANG Huang-bin(蒋煌斌)1, QIU Xiang(邱祥)2, JI Yun-peng(姬云鹏)2, CHEN Wen(陈文)3, ZENG Ling(曾铃)2

1. School of Traffic & Transportation Engineering, Changsha University of Science & Technology,Changsha 410114, China;
2. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
3. Laboratoire d''Etude des Microstructures et de Mécanique des Matériaux, Université de Lorraine,Metz 57070, France

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.

 

Key words: silty mudstone; seepage characteristic; confining pressure; temperature; permeability

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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