Table 4 Initial physical parameters of sandstone.

From: Strength degradation characteristics and damage constitutive model of sandstone under freeze–thaw cycles

Sample grouping

Freeze–thaw cycles

Dry longitudinal wave velocity (m·s−1)

Dry density (g·cm−3)

Saturation density (g·cm−3)

Saturated moisture content (%)

Water saturation coefficient

Y-1-I

Conventional samples

3137

2.25

–

–

–

Y-1-II

Conventional samples

3136

2.27

–

–

–

Y-1-III

Conventional samples

3138

2.26

–

–

–

Y-2-I

0

3137

2.24

2.31

3.78

0.9

Y-2-II

0

3139

2.27

2.33

3.85

0.85

Y-2-III

0

3138

2.26

2.39

3.59

0.85

Y-3-I

20

3136

2.25

2.3

3.84

0.83

Y-3-II

20

3139

2.27

2.31

3.65

0.88

Y-3-III

20

3142

2.28

2.34

3.72

0.89

Y-4-I

40

3142

2.24

2.34

3.83

0.86

Y-4-II

40

3144

2.25

2.35

3.91

0.88

Y-4-III

40

3132

2.26

2.27

3.58

0.87

Y-5-I

60

3142

2.24

2.35

3.55

0.86

Y-5-II

60

3132

2.26

2.36

3.78

0.81

Y-5-III

60

3143

2.27

2.37

3.91

0.9

Y-6-I

80

3139

2.25

2.29

3.72

0.88

Y-6-I

80

3134

2.25

2.32

3.83

0.83

Y-6-II

80

3135

2.28

2.35

3.84

0.84

Average value

3138

2.26

2.33

3.76

0.86

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