Abstract：
Studying the mechanical behavior of rocks under real-time high-temperature conditions is of great significance for the development of energy caverns, nuclear waste disposal projects, and tunneling engineering. In this study, a real-time high-temperature impact compression test was conducted on Sejila Mountain granite to explore the effects of temperature and external load on its mechanical properties. Based on the concepts of damage mechanics and statistics, a coupled thermal-mechanical (T-M) damage constitutive model was established, which considers the temperature effect and uses the double-shear unified strength as the yield criterion. The parameter expressions were clarified, and the accuracy and applicability of the model were verified by experimental data. The research results indicated that high temperatures had an obvious damaging and deteriorating effect on the strength of the granite, while an increase in impact velocity had an enhancing effect on the strength of the granite. The established constitutive model theoretical curve and test curve showed a high degree of agreement, indicating that the coupled T-M model can objectively represent the evolution process of damage in rocks and the physical meaning of its parameters is clear.
摘要：
研究岩石在实时高温条件下的力学行为对能源洞室的开发具有重要意义,核废料处理项目,和隧道工程。在这项研究中,对Sejila山花岗岩进行了实时高温冲击压缩试验，以探讨温度和外部载荷对其力学性能的影响。基于损伤力学和统计的概念，建立了热-机械耦合(T-M)损伤本构模型,其中考虑了温度效应，并使用双剪统一强度作为屈服准则。明确了参数表达式，实验数据验证了模型的准确性和适用性。研究结果表明,高温对花岗岩强度有明显的破坏和劣化作用,而冲击速度的增加对花岗岩的强度有增强作用。建立的本构模型理论曲线与试验曲线表现出高度的一致性,表明耦合T-M模型能够客观地反映岩石损伤的演化过程,其参数的物理意义明确。
