›› 2016, Vol. 37 ›› Issue (8): 2180-2186.doi: 10.16285/j.rsm.2016.08.008

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Seepage flow during crack propagation process and stress coupled model under compression-shear stress conditions

ZHAO Yu1, 2, WANG Chao-lin1, 3, WAN Wen3   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China; 3. Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring of Hunan Province, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
  • Received:2016-04-05 Online:2016-08-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51374257, 50804060), the New Century Excellent Talent Foundation from MOE of China(NCET-09-0844) and Geotechnical Engineering Stability Control and Health Monitoring of Hunan Province Key Laboratory, China(E21619).

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Abstract: The dilatancy and propagation of cracks under compression and shearing are essential to hydromechanical behavior of fractured rock masses. To explore the influence of dilatancy and crack propagation on seepage flow, a new shear constitutive model is developed to describe the features of the pre- and post-shear curves based on residual strength of rocks. Then, by combining the relationship between shear deformation and fracture aperture, a coupled stress-seepage model for fractured rock mass subject to shear dilation process is derived by the minimum potential energy principle and cubic law. In addition, a formulation for determining fracture aperture during crack growth process is obtained by assuming the initiation of mode-I cracks under compression-shear conditions. This model can not only consider shear dilation of rocks, but also imply the effect of crack propagation on the evolution of seepage flow. It is found that the newly developed shear constitutive model is suitable for shear displacement curves with different rough surfaces. A stress dependent seepage model is established by applying the shear constitutive model and is validated by existing coupled shear-flow tests, which is capable of predicting the changes in hydraulic properties of fractured rock masses under compression-shear stress conditions. It is noticed that the stress-seepage model is reliable to reflect hydromechanical behavior of crack propagation by applying the equivalent fracture to the representative of different fractures.

Key words: fracture aperture, fracture propagation, hydraulic conductivity, shear dilatancy

CLC Number: 

  • TU 451

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