高填方路堤边坡在地震作用下的动力响应分析
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摘要
通过建立二维有限差分模型,对地震荷载下高填方路堤边坡的动力响应进行数值模拟,探讨了边坡在地震作用下的变形、位移规律及沿坡面的加速度放大规律。结果表明:在土体性质差异较大的薄弱层,会产生较大的剪切位移;路堤边坡处加速度峰值自下而上先减小后增大,在路堤顶部加速度峰值达到最大;砂卵石在地基中的位置不同,使得路堤顶部位移的周期与振幅不同,其中砂卵石在中部时对抗震来说最不利。
In this paper,a 2-dimensional finite difference model was established to simulate the dynamic responses of filled embankment sustaining seismic loads.Then laws of deformation,displacement and the law of acceleration amplification on the sloping surface were discussed.The results show that it will produce larger shear displacement when the large differences in the nature of the soil weak layer.The peak acceleration of embankment slope from the bottom first decreases and then increases.Acceleration peak reaches the maximum at the top of embankment.The sand and gravels different locations in the foundation,so that the period of the displacement and amplitude at the top of the embankment are also different.The sand and gravel in the central are most unfavorable for the model.
In this paper,a 2-dimensional finite difference model was established to simulate the dynamic responses of filled embankment sustaining seismic loads.Then laws of deformation,displacement and the law of acceleration amplification on the sloping surface were discussed.The results show that it will produce larger shear displacement when the large differences in the nature of the soil weak layer.The peak acceleration of embankment slope from the bottom first decreases and then increases.Acceleration peak reaches the maximum at the top of embankment.The sand and gravels different locations in the foundation,so that the period of the displacement and amplitude at the top of the embankment are also different.The sand and gravel in the central are most unfavorable for the model.
引文
[1]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-560.
[2]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.
[3]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.
[4]黄诚,王安民,任伟忠.水平与竖向地震动的时间耦合模式对边坡动力安全系数的影响[J].岩土力学,2010,30(11):3404-3410.
[2]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.
[3]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.
[4]黄诚,王安民,任伟忠.水平与竖向地震动的时间耦合模式对边坡动力安全系数的影响[J].岩土力学,2010,30(11):3404-3410.
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