Fig. 6
From: Thermally driven fracture aperture variation in naturally fractured granites
Stress and temperature paths during the flow-through experiments. a Step-wise heating experiments \(\#\)N14-S1, \(\#\)N14-S2, and \(\#\)N14-S3, with Specimen N14, where the cell temperature was adjusted in steps. b Constant-rate heating experiments \(\#\)N19-C1 and \(\#\)N19-C2, with Specimen N19, where the cell temperature was increased/decreased continuously. During each experiment, the upstream pore-fluid pressure was continuously adjusted by Pump 2 (i.e., either increase or decrease), to maintain the prescribed constant injection rate of 0.05 \(\text {cm}^{3}\)/min