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Table 2 Experiment specifications

From: Thermally driven fracture aperture variation in naturally fractured granites

Type of heating

Specimen

Test name

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

Temperature (\(^\circ\)C)

Duration (h)

Step-wise heating

N14

\(\#\)N14-S1

20

[25, 50, 70, 90, 110, 80, 50, 25]

115

\(\#\)N14-S2

30

[25, 50, 70, 90, 110, 80, 50, 25]

137

\(\#\)N14-S3

40

[25, 70, 110, 140]

83

Constant-rate heating

N19

\(\#\)N19-C1

20

[25 \(\rightarrow\) 110 \(\rightarrow\) 25]

92

\(\#\)N19-C2

30

[25 \(\rightarrow\) 110 \(\rightarrow\) 25]

101

  1. All experiments were conducted under a constant back pressure of 15 MPa and a constant flow rate of 0.05 \(\text {cm}^{3}\)/min. \(P_{\text{co}\_\text{r}}\) stands for radial confining pressure