| 地震动参数对边坡地震响应的影响规律 |
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| 引用本文： | 张江伟,李小军,袁颖,迟明杰,陈苏.地震动参数对边坡地震响应的影响规律[J].地震学报,2017,39(5):798-805. |
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| 作者姓名： | 张江伟 李小军 袁颖 迟明杰 陈苏 |
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| 作者单位： | 1.河北石家庄 050031 河北地质大学勘查技术与工程学院 |
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| 基金项目： | 国家自然科学基金(51639006，51421005)、国家重点研发计划(2016YFC1402800)和中央公益科研院所基本业务专项(DQJB15C07)联合资助国家重点研发计划2016YFC1402800中央公益科研院所基本业务专项DQJB15C07国家自然科学基金51421005国家自然科学基金51639006 |
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| 摘 要： | 选取了具有不同峰值加速度、频谱和持时的6组地震动加速度时程作为输入，基于有限元数值模拟方法建立了二维均质边坡有限元模型，模拟分析了不同地震动作用下边坡模型的加速度和位移响应，揭示了地震动峰值加速度、频谱和持时对土坡地震响应的影响作用及其规律.研究结果显示:地震动峰值加速度、频谱和持时对土坡地震响应均有显著的影响，其中，边坡坡脚处和坡肩处的变形位移随地震动峰值加速度、特征周期和持时的增大而增大，坡体临空面各点的峰值加速度放大系数呈现随输入地震动特征周期的增大而增大、随输入地震动峰值加速度的增大而减小的规律.研究结果可为地震作用下边坡稳定性设计及防治研究提供参考.
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| 关 键 词： | 地震动参数 土质边坡 动力响应 影响规律 |
| 收稿时间： | 2017-02-10 |
Influence law of ground motion parameters on soil slope seismic response |
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| Institution: | 1.College of Prospecting Technology and Engineering, Hebei GEO University, Shijiazhuang 050031, China2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | Six groups of strong ground motion records with different characteristic parameters were selected as seismic input, a two-dimensional slope model with homogeneous soil was established based on the finite element numerical simulation method, and then the acceleration and displacement responses of the slope model were calculated and analyzed. Finally the influence degree and laws of the PGA, frequency spectrum and duration on the slope responses in earthquakes were revealed. The results showed that the PGA, characteristic period and duration all had an significant effect on slope seismic response. It was also indicated that the displacement of the slope foot and shoulder evidently increased with increase of the PGA, characteristic period and duration of earthquakes, and the amplification coefficients of PGA along the slope free surface also increased with increase of characteristic period while decreased with increase of the PGA. The result can provide reference for the design and prevention of slope stability under earthquake effect. |
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