中文摘要：

为研究三向应力状态下周期荷载对工程岩体长期稳定性的影响,对黄砂岩试样进行了不同围压的常规三轴压缩试验和周期轴向荷载疲劳试验,得到了黄砂岩疲劳破坏的轴向、环向及体积变形特性。试验结果表明：常规三轴轴向周期荷载作用下,黄砂岩疲劳破坏的轴向、环向以及体积变形受到静态应力-应变曲线变形量的控制;疲劳破坏轴向、环向的峰值变形和不可逆变形均符合三阶段倒S型曲线发展演化规律;围压对轴向变形发展规律有一定强化作用,对环向变形发展规律却有所抑制;在疲劳破坏变形过程中,峰值应变ε_（max）具有和不可逆应变ε^p相似的发展规律,弹性应变ε^e在3个阶段基本保持不变,不可逆应变增量Dep的变化规律能够反映3个阶段应变速率的发展演化规律;变形比强度更适合作为岩石疲劳破坏的依据,黄砂岩的疲劳破坏变形特性研究为建立岩石的疲劳破坏力学模型做了基础。

英文摘要：

To research the long-term stability of engineering rock mass under triaxial loading, triaxial compression tests and periodic axial load fatigue tests are conducted on yellow sandstone under different confining pressures. Evolution laws of axial deformation, circumferential deformation and volumetric deformation are obtained. The tests results show that： the axial, circumferential and volumetric deformations of fatigue failure of yellow sandstone under conventional triaxial cyclic loading are controlled by the static complete stress-strain curves. The axial and circumferential peak deformations of fatigue failure and irreversible deformation present an inverted S-shaped law of three stages. The confining pressure can promote the development of the axial deformation, but restrain the development of the circumferential deformation. In fatigue failure deformation process, the development of peak strain Gmax is similar to that of the reversible strain εp, elastic strain εe remains basically unchanged in three stages, and a change law of irreversible strain increment △εD can reflect the evolvement law of the strain rate in three stages. Deformation is more suitable to be used as a fatigue failure criterion of rock rather than strength, and the fatigue deformation properties of yellow sandstone obtained in this paper make the foundation for the establishment of the fatigue failure model.