Utah FORGE: Direct Shear Tests on Saturated Sierra White Granite Joints at Elevated Temperatures

This dataset contains results from laboratory direct shear experiments performed on tension-induced fractures in Sierra White granite under saturated conditions at target temperatures of 50 C and 100 C. The data were collected using a custom water-pressurized chamber equipped with immersion heaters, thermocouples, and instrumentation for measuring shear and normal loads, displacements, pore pressure, and temperature. All tests were conducted at an effective normal stress of 6 MPa and a pore pressure of 1 MPa, with shear loading applied at a constant displacement rate. For the 50 C experiments, ultrasonic wave signals transmitted across the fracture were recorded simultaneously with mechanical measurements; wave data are included for multiple transducer configurations. Wave measurements were not obtained for the 100 C tests due to transducer limitations at elevated temperature. A PDF document accompanies the dataset and summarizes specimen preparation, modifications made to the test apparatus for elevated-temperature conditions, the testing procedure, and the resulting mechanical and geophysical observations.