岩石强度时效性演化模型

发布时间：2018-06-15 03:36

本文选题：岩石强度 + 时间效应　；参考：《岩土力学》2014年06期

【摘要】：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。
[Abstract]:Under certain external loads, the strength of rock materials will decrease with time. In engineering, the sudden failure behavior of rock mass and the long-term strength of rock mass are often caused by the weakening of strength. Therefore, the study on the time effect of rock strength is of great significance to the safety of rock mass engineering construction and the long-term stability of rock mass engineering. Based on the analysis of a large number of experimental results, the evolution law and intrinsic mechanism of rock strength are summarized, and the loss of rock strength and the inherent strength of rock itself are found. The stress state (yield proximity) and the duration of the stress action are related to the stress. On the basis of this, a rock strength aging model with the core of rock cohesion and internal friction angle changing with the above factors is proposed. Through the simulation and analysis of many sets of test data, it is shown that the proposed model can describe the evolution law of rock strength well, and can reflect quantitatively the weakening process of rock strength under different stress levels. The physical meaning is clear, which opens up a new idea and method for the study of time effect of rock strength.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;湖北工业大学土木工程与建筑学院;
【基金】：国家重点基础研究发展计划(973)项目(No.2014CB046902) 中国科学院科技创新“交叉与合作团队”(人教字〔2012〕119号) 中国科学院知识创新工程重要方向项目(No.KZCX2-EW-QN115) 国家自然科学基金项目(No.41172288)
【分类号】：TU45

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