Geomechanics and Engineering

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Experimental study on seepage characteristics of large size rock specimens under three-dimensional stress

  • Sun, Wenbin (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Xue, Yanchao (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Yin, Liming (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Zhang, Junming (College of Mining and Safety Engineering, Shandong University of Science and Technology)
  • Received : 2019.03.22
  • Accepted : 2019.07.31
  • Published : 2019.08.30
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Abstract

In order to study the effect of stress and water pressure on the permeability of fractured rock mass under three-dimensional stress conditions, a single fracture triaxial stress-seepage coupling model was established; By using the stress-seepage coupling true triaxial test system, large-scale rock specimens were taken as the research object to carry out the coupling test of stress and seepage, the fitting formula of permeability coefficient was obtained. The influence of three-dimensional stress and water pressure on the permeability coefficient of fractured rock mass was discussed. The results show that the three-dimensional stress and water pressure have a significant effect on the fracture permeability coefficient, showing a negative exponential relationship. Under certain water pressure conditions, the permeability coefficient decreases with the increase of the three-dimensional stress, and the normal principal stress plays a dominant role in the permeability. Under certain stress conditions, the permeability coefficient increases when the water pressure increases. Further analysis shows that when the gob floor rock mass is changed from high stress to unloading state, the seepage characteristics of the cracked channels will be evidently strengthened.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China Postdoctoral Science Foundation, Shandong University of Science and Technology (SDUST)

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