| 含倾斜夹层场地动力响应的大型振动台试验研究 |
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| 引用本文： | 曹礼聪,周羽哲,马东华,刘飞成,张建经.含倾斜夹层场地动力响应的大型振动台试验研究[J].西南交通大学学报,2019,54(5):953-961. |
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| 作者姓名： | 曹礼聪 周羽哲 马东华 刘飞成 张建经 |
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| 基金项目： | 国家重点研发计划资助项目（2017YFC0504901）；交通运输部建设科技项目（2013318800020）；四川省科技支撑项目（2015SZ0068） |
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| 摘 要： | 为了研究含倾斜夹层场地在地震作用下的动力响应及为可能的场地加固提供指导，基于大型振动台模型试验，研究了含倾斜夹层场地在El Centro地震波作用下的加速度、应变及位移响应特征，同时通过频谱分析讨论了夹层对场地稳定性的影响，并用拟静力分析得到场地的启动临界加速度及场地的稳定系数. 试验结果表明:夹层对于加速度峰值存在明显的削弱效果，加载地震波峰值越大，削弱程度越大，同时基岩中加速度放大系数呈现“量级饱和”特征；夹层处应变峰值最大，当加载地震波峰值大于0.33g时，场地平台与斜坡拐角下基覆中存在另一峰值，应变形状呈现“W”形；夹层对20 Hz附近频段的傅里叶幅值有一定的削弱作用，同一土层反应谱卓越周期基本一致，不同土层反应谱差别较大，夹层处（0.31 s）卓越周期大于基岩（0.19 s）与基覆处（0.21 s）；拟静力分析显示0.33g时场地的稳定系数为3.16，强风化带启动的临界加速度为1.42g.
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| 关 键 词： | 场地 倾斜夹层 动力响应 振动台试验 稳定性 |
| 收稿时间： | 2017-10-23 |
Large Shaking Table Test on Seismic Response of Site with Tilted Interlayer |
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| CAO Licong,ZHOU Yuzhe,MA Donghua,LIU Feicheng,ZHANG Jianjing.Large Shaking Table Test on Seismic Response of Site with Tilted Interlayer[J].Journal of Southwest Jiaotong University,2019,54(5):953-961. |
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| Authors: | CAO Licong ZHOU Yuzhe MA Donghua LIU Feicheng ZHANG Jianjing |
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| Abstract: | To investigate the dynamic response of a complex site with a tilted interlayer and provide a potential reinforcement for the site, a large-scale shaking table model test was done to study the acceleration, strain and displacement responses of the site. The effects of the interlayer on the stability of the site are discussed based on an analysis of the Fourier spectrum and response spectrum under the El Centro seismic wave. Furthermore, the critical acceleration and stability factor of the site are obtained through a pseudo-static analysis. Experimental results show that the interlayer obviously weakens the peak acceleration of the seismic wave and that the degree of impairing effects intensifies with the seismic peak acceleration increasing. There is a feature of ‘magnitude saturation’ for the acceleration amplification coefficient (AAC) of the position of bedrock. The peak strain of the interlayer is greater than those of the other layers. When the input earthquake amplitude is larger than 0.33g, there is another peak strain in the cover layer which is located at a platform corner and the strain curve presents a form is ‘W’. The interlayer can also weaken to some extent the amplitude of the Fourier spectrum at about 20 Hz. The predominant periods of theresponse spectra measured from different cross sections of the same soil layer are similar, but obviously different between different soil layers. The predominant period of the interlayer (0.31 s) is greater than those of the bedrock layer (0.19 s) and the cover layer (0.21 s). According to the pseudo-static analysis, when the peak acceleration of the seismic wave loaded is 0.33g, the site stability factor is 3.16, and the critical acceleration of the potential slip area is 1.42g. |
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