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由于孔隙水长期应力侵蚀作用下的亚临界裂纹扩展对脆性岩石的蠕变特性有着重要的影响.论文基于翼型裂纹细观模型与裂纹扩展法则,得到了常压应力作用岩石的裂纹长度演化规律,然后结合宏观应变关系,分析了岩石的蠕变应变演化规律.基于上述关系,讨论了初始损伤一定情况下,裂纹角度对于岩石的蠕变失效特性及短期强度的影响,结果表明了裂纹角度对于脆性岩石的力学特性有着重要的影响.然后结合花岗岩细观力学试验参数,分析了花岗岩的裂纹尖端强度因子,裂纹长度,损伤,蠕变演化规律.并对比分析了蠕变应变的理论与试验结果,两者具有一定的相似性,验证了理论模型的合理性,进而对脆性岩石工程的设计与施工提供了一定的帮助.
The subcritical crack propagation under long-term pore water stress has an important effect on the creep behavior of brittle rock.According to the airfoil crack mesoscopic model and crack propagation law, the evolution of the crack length of rock under normal pressure and stress is obtained Based on the above relationship, the influence of crack angle on the creep failure characteristics and short-term strength of rock under certain conditions of initial damage is discussed. The results show that the crack angle is of The mechanical properties of brittle rocks have an important effect.According to the mesomechanical parameters of granite, the crack strength, crack length, damage and creep evolution of granite are analyzed.The theory and test results of creep strain Both of them have some similarities, which verify the rationality of the theoretical model and provide some help to the design and construction of brittle rock engineering.