Mechanical Response and Failure Characteristics of Granite Under In Situ High-Temperature and High-Pressure True Triaxial Conditions

results in an approximately 11% increase in peak strength, a 30% increase in peak strain, and a 21% decrease in elastic modulus, accompanied by a decrease in average fracture width and an increase in fractal dimension. This suppresses the formation of a single dominant fracture surface, consequently increasing the complexity of the fracture morphology. This research reveals the mechanical response and failure laws of deep granite under high-temperature and true triaxial conditions, providing important insights for understanding the mechanical properties of deep reservoir rocks and for the design of drilling and fracturing operations.