›› 2013, Vol. 34 ›› Issue (6): 1629-1635.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of permeability characteristics of single rock fracture considering stress history

YANG Jin-bao1, 2, FENG Xia-ting1, PAN Peng-zhi1   

  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Three Gorges Survey and Research Institute Co., Ltd., Wuhan 430010, China
  • Received:2012-03-12 Online:2013-06-10 Published:2013-06-14

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Abstract: Seepage tests under different loading and unloading confining pressures and different hydraulic gradients are conducted on single granite fracture to study the effects of stress history on fracture permeability evolution. Experimental results show that during loading process, flowrate is approximately linear with hydraulic gradient; under the same hydraulic gradient, flowrate decreases with the increase of confining pressure at a step-down rate, but with further increase of confining pressure, the reducing amplitude of the flow becomes smaller and smaller. Under the same confining pressure and hydraulic gradient, the flowrate of the single granite fracture deceases obviously during unloading process compared with that during loading process. Furthermore, flowrate is no longer linear with hydraulic gradient during the unloading process of confining pressure. Comparison between roughness coefficients before and after test shows that, joint roughness coefficient(JRC) of the fracture after test decreases dramatically due to the normal compression and scouring of the seepage fluid. Obvious hysteresis of fracture permeability recovering is also observed, indicating inelastic deformation of the fracture occurs under combined effects of normal stress and fluid scouring.

Key words: rock single fracture, rock permeability, joint roughness coefficient, stress history, loading-unloading

CLC Number: 

  • TU 452
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