Abbreviations
- Q :
-
Volumetric flow rate
- w :
-
Width of a fracture
- b h :
-
Hydraulic aperture
- J :
-
Hydraulic gradient
- J c :
-
Critical hydraulic gradient
- P :
-
Hydraulic pressure
- u :
-
Flow velocity vector
- ρ :
-
Fluid density
- E :
-
Nonlinear effect factor
- T :
-
Transmissivity
- T/T 0 :
-
Normalized transmissivity
- x i :
-
X-coordinate of the fracture surface profile
- z i :
-
Z-coordinate of the fracture surface profile
- Z 2 :
-
Dimensionless roughness parameter
- a :
-
Linear coefficient in the Forchheimer’s law
- b :
-
Nonlinear coefficient in the Forchheimer’s law
- l :
-
Fracture spacing
- F x :
-
X-directional horizontal boundary load
- F y :
-
Y-directional horizontal boundary load
- σ fne :
-
Effective stress
- µ :
-
Dynamic viscosity
- β :
-
Included angle
- λ :
-
Pressure ratio
- α :
-
First regression coefficient
- JRC:
-
Joint roughness coefficient
- Re :
-
Reynolds number
- Re c :
-
Critical Reynolds number
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Acknowledgements
The financial supports from the National Key Basic Research and Development Program of China, China (No. 2017YFC0603001), National Natural Science Foundation of China, China (Nos. 51734009, 51704279, 51709260), and Natural Science Foundation of Jiangsu Province, China (No. BK20170270) are gratefully acknowledged.
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Yin, Q., Jing, H., Ma, G. et al. Investigating the Roles of Included Angle and Loading Condition on the Critical Hydraulic Gradient of Real Rock Fracture Networks. Rock Mech Rock Eng 51, 3167–3177 (2018). https://doi.org/10.1007/s00603-018-1526-x
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DOI: https://doi.org/10.1007/s00603-018-1526-x