| 地震荷载作用下深厚饱和砂土中桩动力特性试验研究 |
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| 引用本文： | 郝宇杰,郭竟语,王玉珏,梁春明,马建林.地震荷载作用下深厚饱和砂土中桩动力特性试验研究[J].路基工程,2023,0(1):99-106. |
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| 作者姓名： | 郝宇杰 郭竟语 王玉珏 梁春明 马建林 |
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| 作者单位： | 1.西南交通大学土木工程学院，成都 610031 |
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| 基金项目： | 中铁二院工程集团有限责任公司科学研究项目（KYY2019135（19-23）） |
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| 摘 要： | 以某工程为依托，进行1∶20比例缩尺2×1桩基模型振动台试验，输入与当地地震设计反应谱接近的3种地震波，研究深厚饱和砂土场地条件下砂土-桩基-结构动力相互作用响应规律。试验再现液化宏观现象，研究表明：深厚饱和砂土场地对地震波高频部分过滤作用显著；随着地震动强度增大，场地液化程度提高，结构水平运动由高频向低频移动，频带范围变宽。同时，上部结构水平运动放大系数由4.56降低至2.75，但该效应对承台不明显；上部结构及承台在加载过程中相互影响，上部结构对承台的影响较大；砂层中部（距土体表面8D处）桩身弯矩相对于桩顶弯矩对输入地震波峰值加速度敏感度更高，随砂层液化程度增大而显著增大。
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| 关 键 词： | 深厚饱和砂土层 桩基础桥梁 地震荷载作用 砂土液化 土-桩-结构相互作用 桩身弯矩 |
| 收稿时间： | 2022-05-23 |
Experimental Study on Dynamic Characteristics of Piles in Deep Saturated Sand under Seismic Load |
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| Abstract: | Based on a project, a 1∶20 scale 2×1 shaking table test of pile foundation model was carried out, which inputs three kinds of seismic waves close to the local seismic design response spectrum. The dynamic interaction response law of sand-pile-structure in deep saturated sand site was studied, and the experiment reproduced the macro-phenomenon of liquefaction. The research shows that the high-frequency part of seismic wave is obviously filtered by deep saturated sand site. With the increase of earthquake intensity, the level of ground liquefaction increases, the horizontal motion of the structure moves from high frequency to low frequency, and the frequency band becomes wider. At the same time, the amplification factor of horizontal motion of superstructure is reduced from 4.56 to 2.75, but the effect is not obvious on the pile cap. The superstructure and pile cap affect each other in the loading process, and the superstructure has a great influence on the pile cap. The pile bending moment in the middle of the sand layer (8D from the soil surface) is more sensitive to the peak acceleration of the seismic wave than the pile top bending moment, which increases significantly with the increase of the level of sand layer liquefaction. |
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