Table 2 Mechanical parameters of sandstone under hydraulic coupling effect.

From: Experimental study on effective stress coefficient of sandstone based on Mohr–Coulomb criterion under hydraulic-mechanical coupling

σ3/MPa

p/MPa

σ1/MPa

Θ/MPa

E50/GPa

μ

α

ωs

10

0

68.71

88.71

—

—

—

—

2

67.21

87.21

5.219

0.615

0.753

0.109

4

63.89

83.89

4.433

0.687

0.827

0.175

6

59.95

79.95

3.695

0.740

0.908

0.212

8

56.36

76.36

3.149

0.763

0.925

0.225

20

0

90.96

130.96

—

—

—

—

4

84.04

124.04

4.952

0.611

0.561

0.380

8

79.32

119.32

4.040

0.657

0.616

0.320

12

74.48

114.48

3.046

0.669

0.630

0.302

16

69.15

109.15

2.250

0.678

0.653

0.300

30

0

105.54

165.54

—

—

—

—

6

104.23

164.23

5.742

0.598

0.233

0.062

12

99.68

159.68

4.465

0.608

0.322

0.139

18

94.34

154.34

3.194

0.635

0.376

0.177

24

88.82

148.82

2.152

0.639

0.407

0.198

  1. Notes: σ3 is the confining pressure; p is the pore water pressure; σ1 is the peak strength; Θ is the volume stress; E50 is the modulus of elasticity at 50% of the peak strength of the specimen; μ is the Poisson’s ratio; α is the effective stress coefficient; ωs is the attenuation coefficient of peak strength.
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