Dynamic Response and Dynamic Failure Mode of a Weak Intercalated Rock Slope Using a Shaking Table
Dynamic Response and Dynamic Failure Mode of a Weak Intercalated Rock Slope Using a Shaking Table
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DOI：
10.1007/s00603-016-0971-7
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发表时间：
2016-08-01
影响因子：
6.2
通讯作者：
Yan, Kongming
中科院分区：
文献类型：
--
作者：
Fan, Gang;Zhang, Jianjing;Yan, Kongming
通过大型振动台试验，研究了平行地质层理边坡（层理边坡）和横切地质层理边坡（反层理边坡）的动力响应。试验结果表明，加速度放大系数随着海拔的升高而增大，当输入地震振幅大于0.3 g时，顺层和反层边坡均开始表现出非线性动力响应特征。随着海拔的升高，顺层坡面的位移也随之增大。反之，反层理坡面位移先增大后减小；坡度在相对高程0.85处出现隆起。顺层坡面的位移大于反层理坡面的位移。与顺层边坡相比，反层理边坡的地震稳定性更好。基于希尔伯特-黄变换和边际谱理论，确定了层理和反层理斜坡的动态损伤过程。结果表明，顺层边坡的动力破坏模式主要表现为坡后竖向拉裂、地层沿软弱夹层顺层滑移、坡顶岩体崩塌等。但反顺层边坡的动力破坏模式主要表现为水平与竖向裂隙交错、软弱夹层挤压、坡顶破坏等。
A large-scale shaking table test was performed to study the dynamic response of slopes parallel to geological bedding (bedding slopes) and slopes that cross-cut geological bedding (counter-bedding slopes). The test results show that the acceleration amplification coefficients increase with increasing elevation and, when the input earthquake amplitude is greater than 0.3 g, both bedding and counter-bedding slopes begin to show nonlinear dynamic response characteristics. With increasing elevation, the displacement of the bedding slope surface increases greatly. Conversely, the displacement of the counter-bedding slope surface increases first and then decreases; the slope develops a bulge at the relative elevation of 0.85. The displacement of the bedding slope surface is greater than that of the counter-bedding slope. The counter-bedding slope is more seismically stable compared with the bedding slope. Based on the Hilbert-Huang transform and marginal spectrum theories, the processes that develop dynamic damage of the bedding and counter-bedding slopes are identified. It is shown that the dynamic failure mode of the bedding slope is mainly represented by vertical tensile cracks at the rear of the slope, bedding slide of the strata along the weak intercalation, and rock collapse from the slope crest. However, the dynamic failure mode of the counter-bedding slope is mainly represented by staggered horizontal and vertical fissures, extrusion of the weak intercalation, and breakage at the slope crest.