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以锦屏二级水电站T2 b和6T2 y深埋大理岩循环加、卸载试验结果为基础,对不同围压下大理岩弹性参数的演化规律进行研究,得出其弹性模量随围压和内变量的变化显著,而泊松比随围压则变化不明显。基于试验结果确定了锦屏大理岩弹性模量与围压和内变量的定量关系,建立了考虑弹性参数围压效应的大理岩弹塑性耦合模型,并在有限差分软件FLAC3D中进行了数值实现,用于模拟分析大理岩室内三轴压缩试验结果,并将模拟结果与不考虑弹性参数围压效应的计算结果进行对比,结果表明:考虑大理岩弹性参数围压效应的数值模拟与试验结果更吻合。研究方法和结果对于提高深部工程围岩(特别是具有小变形破坏特性的硬脆性围岩)变形计算的准确性具有重要的参考价值和借鉴意义。
Based on the results of cyclic loading and unloading experiments of T2 b and 6T2 y deep-buried marble in Jinping No.2 hydropower station, the evolution law of elastic parameters of marble under different confining pressure was studied. The results show that the elastic modulus increases with the confining pressure and The variables change significantly, while the Poisson’s ratio does not change obviously with the confining pressure. Based on the experimental results, the quantitative relationship between the elastic modulus and the confining pressure and internal variable of Jinping marble was established, and the elastic-plastic coupling model of marble was established considering the confining pressure effect of elastic parameters. The finite element software FLAC3D was used to realize the numerical simulation. It is used to simulate and analyze the results of triaxial compression tests in marble. The simulation results are compared with those calculated without confining effect of elastic parameters. The results show that the numerical simulation considering the confining pressure effect of marble elastic parameters is in good agreement with the experimental results . The research methods and results have important reference values and references for improving the accuracy of deformation calculation of surrounding rock in deep engineering, especially for hard and brittle surrounding rock with small deformation and failure characteristics.