| 液化自由场地震响应大型振动台模型试验分析 |
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| 引用本文： | 许成顺,豆鹏飞,杜修力,陈苏,韩俊艳.液化自由场地震响应大型振动台模型试验分析[J].岩土力学,2019,40(10):3767-3777. |
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| 作者姓名： | 许成顺 豆鹏飞 杜修力 陈苏 韩俊艳 |
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| 作者单位： | 1. 北京工业大学 城市与工程安全减灾教育部重点实验室，北京 100124；2. 中国地震局地球物理研究所，北京 100081 |
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| 基金项目： | 国家自然科学基金面上项目(No. 51578026)；国家自然科学基金创新研究群体项目科学基金(No. 51421005)；国家自然科学基金优秀青年基金(No.51722801)。 |
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| 摘 要： | 开展了含上部黏土层、饱和砂土层、密实砂土层的可液化自由场地在水平地震动激励下的大型振动台模型试验研究，分析了地震动激励时饱和砂土液化后场地加速度、位移、孔压比时空响应等动力响应。试验结果表明：在小震激励时，场地动力反应较小，加速度反应自下而上不断放大，各深度处孔压比均较小，模型地基整体处于弹性反应阶段；0.3g汶川地震卧龙台地震记录输入时，孔压积累迅速，可液化土体最上部土层孔压比达到1，饱和土体液化，模型地基表现出明显的非线性反应特征，加速度反应在饱和砂土层中未有明显放大，土体卓越周期对应的反应加速度自下而上有不断增大趋势。该研究是土-群桩-上部结构体系大型振动台系列试验中可液化自由场动力反应部分，可供今后做对比分析和验证数值模拟参考。
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| 关 键 词： | 液化 自由场地 振动台试验 动力反应 孔压比 |
| 收稿时间： | 2018-07-23 |
Large-scale shaking table model test of liquefiable free field |
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| XU Cheng-shun,DOU Peng-fei,DU Xiu-li,CHEN Su,HAN Jun-yan.Large-scale shaking table model test of liquefiable free field[J].Rock and Soil Mechanics,2019,40(10):3767-3777. |
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| Authors: | XU Cheng-shun DOU Peng-fei DU Xiu-li CHEN Su HAN Jun-yan |
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| Institution: | 1. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;
2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | In this paper, a large-scale shaking table test of the free field with the soil liquefaction was conducted under horizontal ground motion excitation. The temporal and spatial response of the free field under earthquake excitation was analyzed. The results showed that when the excited earthquake was small, the dynamic response of liquefiable site and pore pressure ratio at different buried depths of soil was small, whereas the peak acceleration from bottom to top enlarged. This indicated that the model foundation was in the linear elastic phase. When the seismic record of 0.3g Wenchuan earthquake was inputted, the pore pressure accumulated rapidly and the pore pressure ratio of the topsoil layer reached 1. The model foundation showed obvious nonlinear response characteristics after liquefaction. The peak acceleration in the liquefiable soil layer was not significantly enlarged, while there was an increasing trend of response acceleration from bottom to top. The results of this paper can be used for comparative analysis and verification of numerical simulation in the future |
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| Keywords: | liquefaction free filed shaking table test seismic response pore pressure ratio |
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