冲击拉伸应力状态下热损伤岩石的力学效应及细观破裂机制研究

It is not only an important scientific problem but also an important engineering problem to explore the real stress state and meso-fracture mechanism of underground rock mass under impact tensile load in high-temperature environment. Based on this, this project intends to study a series of key scientific issues such as the mechanical response law of rocks, the macro-failure characteristics, the law of energy dissipation, the mechanism of thermal-mechanical coupled damage evolution, and the mechanism of meso-structure changes relying on the large-diameter split Hopkinson tensile bar test system, split Hopkinson pressure bar test system and scanning electron microscope, using theoretical analysis, numerical simulation and experimental research methods. The influence mechanism of temperature and strain rate on the rock macroscopic mechanical characteristics is analyzed, the attenuation and degradation model of high-temperature rocks in impact tensile loading tests is established, the relationship between the macroscopic mechanical properties and the mesoscopic fracture mechanism is revealed, and the mesoscopic mechanical constitutive model of thermally damaged rock under tensile stress is constructed. Relevant research contents will not only provide scientific theoretical basis and important technical support for the design and construction for the design and stability assessment of underground rock mass engineering, but also play a further role in promoting the development of rock deformation and fracture mechanics.

探索地下岩体工程在高温环境场中受到冲击拉伸荷载作用时的实际应力状态以及细观破裂机制既是重要的科学问题，又是重要的工程问题。基于此，本项目拟依托大直径分离式霍普金森拉杆试验系统、分离式霍普金森压杆试验系统和扫描电子显微镜，运用理论分析、数值模拟以及试验研究的方法，对冲击拉伸应力状态下高温岩石的力学响应规律、宏观破坏特征、能量耗散规律、热力耦合损伤演化机制、细观结构变化机理等一系列关键科学问题展开研究，分析拉伸应力加载下温度和应变率对岩石宏观力学特性的影响机制，建立冲击拉伸加载试验中高温岩石的衰减劣化模型，揭示岩石的宏观力学特性与细观破裂机制之间的内在联系，构建拉应力下热损伤岩石的细观力学本构模型。相关研究内容将不仅为地下岩石工程的设计施工和安全稳定性评估提供科学的理论依据和重要的技术支撑，还将会对岩石变形和断裂力学的发展起到进一步的推动作用。

内容获取失败，请点击重试