Effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture

The accurate evaluation of pore pressure and injected volume is crucial for the laboratory characterization hydromechanical responses rock fractures. This study reports a series experiments to systematically demonstrate effects external temperature dead on measurements in fracture. We characterize hydraulic aperture fracture as function effective normal stress using exponential model. model then employed predict change without influences volume. changes cyclic loading test due Joule-Thompson effect fluids. can be well explained by thermal pressurization Our results also show that significantly lower during under undrained conditions. substantially enlarged typical system. Internal measurement fiber optic sensor cannot exclude volume, primarily because good communication between suggests response should evaluated inter-laboratory comparison.