岩质边坡地震响应振动台试验研究
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TU45;TH82

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(国家自然科学基金资助项目(51679173);湖北省自然科学基金重点资助项目(2016CFA083)


Shaking Table Test on Seismic Response of Rock Slope
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    摘要:

    为了探究反倾岩质边坡在地震作用下的动力响应特性,对一个包含两组正交节理的二维反倾边坡进行振动台试验研究。试验考虑了不同动力参数如波型、幅值和频率对边坡动力响应的影响规律。研究结果表明,坡面水平加速度放大系数随相对高程的增加而增大,基本呈现非线性放大特征,越接近坡顶放大趋势越明显;随着波幅值的增加,加速度放大系数总体呈现増大趋势,但会受岩体结构和波型的影响;随着波频率的增大,加速度放大系数有增大趋势;波型对边坡动力响应有一定影响。该模型边坡在动力作用下主要表现为近坡表处剪切裂纹与张拉裂纹相互扩展并贯通,形成台阶式裂缝的破坏现象,坡体整体沿着节理面发生弯曲拉裂破坏。该研究具有一定的理论和实践意义。

    Abstract:

    In order to study the dynamic response of anti-dip layered rock slope models, one 2D physical model of anti-dip layered rock slope containing two groups of rock joints is designed for the shaking table test. The influence of different dynamic parameters including wave type, amplitude and frequency on the dynamic response of the slope model is considered. The research results reveal that the amplification coefficient of peak ground acceleration(PGA)increases with increasing the relative elevation, which is basically showed the non-linearly amplification characteristics, and this amplification trend is obvious near the slope top. With the increase of acceleration amplitude, PGA amplification coefficients rise on the whole, but it is influenced by rock structure and wave type. PGA amplification coefficients increase with the increase of frequency, and the growth trend become stronger near the slope top. The slope model under seismic loads mainly presents that shear cracks and tension cracks extend, connect and from step-type fractures. The failure of the slope is mainly caused by bending crack along joint surfaces. The study has theoretical and practical significance.

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  • 在线发布日期: 2018-07-04
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