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在一定的外界荷载作用下,岩石材料的强度会随时间不断降低,在工程上常表现为由于强度的弱化而导致岩体的突发性破坏行为以及岩体的长期强度等不同现象和问题。因此,岩石强度的时间效应研究对岩体工程施工安全和工程长期稳定性都具有重要的指导意义。在对大量试验结果分析的基础上,总结了岩石强度演化规律与内在机制,发现岩石强度的损失与岩石本身的固有强度、所受应力状态(屈服接近度)以及应力作用的持续时间有关,在此基础上,提出了以岩石凝聚力和内摩擦角随上述因素变化为核心的岩石强度时效性演化模型。通过对多组试验数据的模拟分析表明,提出的岩石强度时效性演化模型能很好地描述岩石强度的演化规律,可以较好地定量反映不同应力水平下岩石强度弱化过程,且物理意义明确,为岩石强度的时间效应研究开拓了一个新的思路和方法。
Under the action of certain external loads, the strength of rock material will decrease with time. In engineering, it is often manifested in different phenomena and problems such as the sudden failure of rock mass and the long-term strength of rock mass due to the weakening of the strength. Therefore, the study of the time effect of rock strength has important guiding significance for rock construction safety and long-term stability of the project. Based on the analysis of a large number of test results, the evolution law and intrinsic mechanism of rock strength are summarized. It is found that the loss of rock strength is related to the inherent strength of rock itself, the stress state (yield proximity) and the duration of stress. On this basis, the evolution model of rock strength aging based on the changes of rock cohesion and internal friction angle is put forward. Through the simulation analysis of multiple sets of experimental data, it is shown that the proposed evolution model of rock strength and age can well describe the evolution law of rock strength, and can quantitatively reflect the weakening process of rock strength under different stress levels. The physical meaning is clear, It has opened up a new idea and method for the study of the time effect of rock strength.