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通过泥质砂岩单轴压缩蠕变试验,揭示岩石蠕变变形与破坏的特点,反映了不同应力路径下的岩石蠕变速率与发展过程,建立了泥质砂岩的非线性蠕变模型,并通过对试件施加侧向刚性约束和锚固约束,以反映地下工程围岩在平面应变状态和支护状态下的蠕变特性。研究结果表明,锚固约束可以显著提高岩石发生稳定蠕变的应力阀值,减缓蠕变速率。根据改进的蠕变方程进行试验数据的拟合,确定了改进的西原模型蠕变方程中的各物理量。与单轴蠕变试验结果对比表明,该模型的计算结果与试验数据吻合较好,说明改进的西原模型可较好地反映岩石加锚后的蠕变特征。研究结果对深部地下工程围岩的变形与稳定控制研究具有重要的指导意义。
Through the uniaxial compression creep test of shaly sands, the characteristics of rock creep deformation and failure are revealed, the creep rate and development process of rock under different stress paths are reflected, and the nonlinear creep model of shaly sands is established and passed Applying the lateral rigid constraint and the anchoring constraint to the specimen to reflect the creep characteristics of the surrounding rock in the plane strain state and the support state. The results show that the anchoring constraints can significantly increase the stress creep threshold of rock and slow down the creep rate. According to the improved creep equation, the experimental data are fitted to determine the physical quantities in the improved creep equation of the Nishihara model. Compared with the results of uniaxial creep tests, the calculated results of the model agree well with the experimental data, which shows that the improved model of Nishihara can better reflect the creep characteristics after the rock is anchored. The research results have important guiding significance for the study of deformation and stability control of surrounding rock in deep underground engineering.