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Table 4 Fracture closure

From: Thermally driven fracture aperture variation in naturally fractured granites

Experiment

\({P}_{\text{co}\_\text{r}}\) (MPa)

\(T_\text{i}\) (\(^\circ\)C)

\(T_\text{f}\) (\(^\circ\)C)

\(\Delta\) t(h)

\(b_\text{hi}\) (μm)

\(b_\text{hf}\) (μm)

\(\text{d}b_\text{hyd}/\text{d}t\) (10\(^{-11}\) m/s)

\(\#\)N14-S1

20

25

110

70

11.19

7.25

− 1.55

110

25

44

7.25

9.00

+ 1.10

\(\#\)N14-S2

30

25

110

85

8.32

4.56

− 1.23

110

25

52

4.56

3.74

− 0.44

\(\#\)N14-S3

40

25

140

83

3.30

1.61

− 0.57

\(\#\)N19-C1

20

25

110

51

12.00

7.74

− 2.30

110

25

41

7.74

10.65

+ 1.98

\(\#\)N19-C2

30

25

110

67

10.06

2.54

− 3.11

110

25

34

2.54

2.06

− 0.40

  1. Hydraulic measurements of hydraulic aperture (\(b_\text{hyd}\)), where \(T_\text{i}\) and \(T_\text{f}\) are the temperatures at the beginning and at the end of the respective cycle, \(\Delta\)t is the duration of the cycle, \(b_\text{hi}\) and \(b_\text{hf}\) are the hydraulic apertures at the beginning and at the end of the respective cycle, and \({P}_{\text{co}\_\text{r}}\) is the radial confining pressure