循环荷载下节理岩体边坡动力响应的试验研究

发布时间：2018-08-30 08:47

【摘要】：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。
[Abstract]:Under the long-term cyclic action of the vibration load, the primary structural plane in the rock slope may expand and produce new rupture surface, which directly affects the stability of the rock slope. Taking a jointed rock slope as the prototype, the model frame is made according to the similarity theory and the indoor jointed rock slope model is built in the model. The vibration table is used to load the slope model. The dynamic response law of jointed rock slope under vibration load of 1.0 ~ 1.25 ~ 1.5 mm is studied, and the deformation difference of slope model is compared when the amplitude of horizontal direction and vertical direction is 1.5 mm. The cyclic loading test shows that the slope deformation increases with the vibration load amplitude and vibration time, the slope model is more sensitive to the vertical vibration load, and the slope model is subjected to the vibration load. The deformation at the top is larger than the deformation at the bottom, and the long term vibration load will lead to the extension, expansion and penetration of the primary cracks, which will cause the slope deformation to increase. According to the deformation conditions, the deformation process of slope under vibration load and the two possible failure modes of integral landslide and local collapse caused by deformation are proposed. The results are useful for the theoretical study and engineering application of the dynamic response of jointed rock slope under cyclic loading, the fatigue degradation mechanism and the long-term safety of slope engineering.
【作者单位】：福州大学岩土工程与工程地质研究所;国土资源部丘陵山地地质灾害防治重点实验室;福建省地质环境监测中心;
【基金】：国家自然科学基金资助项目(41072232) 福建省自然科学基金资助项目(2010J01254)~~
【分类号】：TU45

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