Thermo-mechanical coupling in cracked granite: Influence of crack inclination on fracture behavior and temperature evolution

IF 8

Rock Mechanics Bulletin Pub Date : 2026-04-01 Epub Date: 2025-11-04 DOI:10.1016/j.rockmb.2025.100272

Chenrui Huang , Chaomin Mu , Fei Wang , Yangyong Wu

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Abstract

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 prefabricated 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 temperature rise is strongly dependent on inclination. The maximum rise (up to 9.266 °C) 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.

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裂纹花岗岩的热-力耦合：裂纹倾角对断裂行为和温度演化的影响

裂缝倾角（α）在花岗岩的动力破坏和热-力耦合过程中起着关键作用，对岩爆监测和防治具有重要意义。采用分离式霍普金森压杆（SHPB）系统对具有不同预制裂纹倾角（α = 0°、30°、60°、90°）的花岗岩试件进行了试验。利用高速红外热像仪实时监测瞬态裂纹尖端温度，并利用数字图像相关技术分析裂纹扩展过程。结果表明：1)裂纹扩展模式与力学性能：增大裂纹倾角可使裂纹从纯拉伸扩展模式向拉伸-剪切混合模式转变；在α = 60°时，增强的剪切促进了裂纹的分支，而在α = 90°时，裂纹闭合抑制了裂纹的扩展并引起局部损伤。2)强度特征：峰值应力相对于α呈“u”型趋势，在α = 60°处达到最低值。3)热响应：裂纹尖端温升与倾角密切相关。在α = 30°和60°时，由于明显的拉伸-剪切耦合和摩擦滑移，温度最大上升（高达9.266°C），而α = 0°和90°时，温度的上升幅度较小。4)两阶段温度演变：在峰值应力之前，~ 80%的温升来自塑性工作；峰值应力过后，裂纹滑移和摩擦起主导作用，导致升温加速。5)裂缝尖端温升是局部能量集中和灾害风险的敏感指标，为深部开采的监测和预防策略提供理论支持。

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来源期刊

Rock Mechanics Bulletin

CiteScore

2.40

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0.00%

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