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岩石力学通报（英文）
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2026年2期
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Thermo-mechanical coupling in cracked granite:Influence of crack inclination on fracture behavior and temperature evolution
Thermo-mechanical coupling in cracked granite:Influence of crack inclination on fracture behavior and temperature evolution
摘要
Crack inclination angle(α)plays a critical role in the dynamic failure and thermo-mechanical coupling of granite,which is vital for rockburst monitoring and prevention.In this study,granite specimens with various pre-fabricated crack inclinations(α=0°,30°,60°,90°)were tested using a split Hopkinson pressure bar(SHPB)system.Transient crack tip temperatures were monitored in real time by high-speed infrared thermography,and crack propagation was analyzed using digital image correlation(DIC).The results show that:1)Propagation mode and mechanical properties:Increasing crack inclination causes a transition from pure tensile propagation to tension-shear mixed modes.At α=60°,enhanced shear promotes branching cracks,while at α=90°,crack closure suppresses propagation and induces localized damage.2)Strength characteristics:Peak stress exhibits a"U-shaped"trend with respect to α,reaching the lowest value at α=60°.3)Thermal response:Crack tip tem-perature rise is strongly dependent on inclination.The maximum rise(up to 9.266 ℃)occurs at α=30° and 60° due to pronounced tension-shear coupling and frictional slip,whereas α=0° and 90° show smaller increases.4)Two-stage temperature evolution:Before peak stress,～80％of the temperature rise originates from plastic work;after peak stress,crack slip and friction dominate,leading to accelerated heating.5)Crack tip temperature rise serves as a sensitive indicator of local energy concentration and disaster risk,providing theoretical support for monitoring and prevention strategies in deep mining.
年，卷(期)：
2026, 5(2)
机标分类号：
R395.4
TG751.2
O646
在线出版日期：
2026年6月24日
