Research Article
Pressure-Shear Crack Initiation and Expansion Mechanism of Complex Cracked Rock Mass under the Seepage Stress
Table 1
The physical parameters of the rock mass.
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 |  |  | Sandstone | Coal seam | Cement rock | Water-bearing sandstone | Cement rock |  | 
 |  | Thickness m | 20 | 3 | 30 | 40 | 65 |  | Elastic modulus (GPa) | 2.6 | 16 | 18 | 36 | 18 |  | Compressive strength (MPa) | 60 | 25 | 40 | 90 | 35 |  | Poisson’s ratio | 0.2 | 0.32 | 0.25 | 0.15 | 0.27 |  | Permeability coefficient (m/d) | 0.01 | 0.01 | 0.01 | 100 | 0.01 |  | Homogeneity | 5 | 10 | 2 | 4 | 2 |  | 
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