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在振动荷载的长期循环作用下,岩质边坡中的原生结构面可能扩大并产生新的破裂面,直接影响到岩质边坡的稳定性。以某节理岩体边坡为原型,根据相似理论制作模型框架并在其内建造室内节理岩体边坡模型,利用振动台对边坡模型进行振动加载,研究在振幅分别为1.0,1.25,1.5 mm的振动荷载作用下节理岩体边坡的动力响应规律,对比水平方向和竖直方向振幅都为1.5 mm时边坡模型的变形差异。循环加载试验表明,在振动荷载作用下,边坡变形随振动荷载振幅、振动时间的增大而增大;边坡模型对于竖向的振动荷载更加敏感;边坡模型在受到振动荷载作用时,顶部的变形大于底部的变形;长期的振动荷载作用会导致原生裂隙延伸、扩张、贯通,引起边坡变形增大;根据变形情况提出边坡在振动荷载作用下的变形过程及变形导致的整体性滑坡和局部滑塌2种可能的破坏模式。研究结果对节理岩体边坡在循环荷载作用下的动力响应、疲劳劣化机制和边坡工程的长期安全性等理论研究和工程应用具有参考意义。
Under the long-term cyclic vibration loading, the original structural plane in rock slope may expand and produce new rupture surface, which will directly affect the stability of rock slope. Based on the similar theory, the model frame was made and the slope model of the rock mass was built in this model. The rock slope model was vibrated and loaded by the vibrating table. When the amplitudes were 1.0, 1.25, 1.5 mm under the action of vibrating load, the deformation of the slope model is compared when the amplitudes of horizontal and vertical directions are both 1.5 mm. The cyclic loading tests show that the deformation of the slope increases with the vibration amplitude and the vibration time under the action of the vibration load. The slope model is more sensitive to the vertical vibration load. When the slope model is subjected to the vibration load, The deformation at the top is larger than the deformation at the bottom. The long-term vibration loading will lead to the extension, expansion and penetration of the primary cracks, which will cause the deformation of the slope to increase. According to the deformation, the deformation process of the slope under vibration loading and the integrity caused by the deformation Landslide and local slump two possible modes of destruction. The research results have reference significance to the theoretical research and engineering application of the jointed rock mass slope under cyclic loading, the fatigue degradation mechanism and the long-term safety of slope engineering.