Table 3 Compressive strength and deterioration degree of coal samples with different water immersion times.

From: Study on the strength deterioration characteristic and damage model of coal pillar dams with repeated water immersion in underground reservoirs

Time

Confining pressure

2 MPa

4 MPa

6 MPa

8 MPa

Rc (MPa)

Si (%)

ΔSi (%)

Rc (MPa)

Si (%)

ΔSi (%)

Rc (MPa)

Si (%)

ΔSi (%)

Rc (MPa)

Si (%)

ΔSi (%)

0

47.47

0

0

52.24

0

0

57.92

0

0

64.89

0

0

1

39.20

17.42

17.42

43.96

15.85

15.85

50.16

13.40

13.40

56.83

12.42

12.42

2

36.54

23.03

5.61

41.60

20.37

4.52

47.24

18.44

5.04

53.71

17.23

4.81

3

33.31

29.83

6.80

38.14

27.00

6.63

43.86

24.27

5.83

50.37

22.38

5.15

4

31.90

32.80

2.97

36.71

29.73

2.73

42.68

26.31

2.04

48.56

25.17

2.79

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