| 潼西改扩建工程路堤地震动力响应分析 |
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| 引用本文： | 李超,张文超,李哲.潼西改扩建工程路堤地震动力响应分析[J].路基工程,2015,0(4):60-63. |
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| 作者姓名： | 李超 张文超 李哲 |
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| 作者单位： | 长安大学公路学院, 西安 710064 |
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| 摘 要： | 为分析在地震荷载作用下路堤的动力响应,以潼西改扩建工程为依托,运用MIDAS/GTS有限元程序建立潼西高速公路改扩建工程数值计算分析模型,分析了公路路面的水平和竖向位移响应和路堤边坡面动力响应。结果表明:在地震荷载作用下,距旧路中心距离越近,最大水平和竖向位移越小;新旧路基结合部产生明显的相对水平位移,路面发生断裂破坏的概率最大;同一地震荷载作用下,不同高程路堤的加速度的放大系数并不相同,随着高程的增加,放大系数整体上逐渐变大;当路堤坡顶观测点出现水平位移峰值时,坡面其它各观测点同样出现水平位移峰值,坡顶观测点的水平位移和加速度峰值并不同步,水平位移峰值滞后于加速度峰值。
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| 关 键 词： | 路堤 地震 加速度 MIDAS/GTS有限元程序 动力响应 |
| 收稿时间： | 2019-11-06 |
Analysis on Dynamic Response of Embankment to Earthquake in Reconstruction and Expansion Project of Tongguan-Xi'an Railway |
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| Abstract: | To analyze the dynamic response of embankment under the action of earthquake load,this paper,based on the reconstruction and expansion project of Tongguan-Xi’an Railway,established the numerical model thereof with MIDAS/GTS finite element program to study the horizontal and vertical displacement response of highway pavement,and the dynamic response of embankment slope surface.The results show that,under the action of earthquake load,the closer distance to the center of old road,the smaller the maximum horizontal and vertical displacements the junction of new and old subgrade has so obvious relative horizontal displacement that the pavement is subject to largest probability of fracture failure under the action of the same earthquake,the embankment in different elevation has different acceleration amplification factor and,as the elevation increases,the amplification factor increases gradually as a whole when the peak horizontal displacement arises at the observation point on the slope top,the same goes at the other observation points on the slope surface,and the peak values of horizontal displacement and acceleration do not go simultaneously and the peak horizontal displacement lags behind the peak acceleration. |
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