| 盾构扩挖地铁车站结构地震反应特性振动台试验 |
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| 引用本文： | 安军海,陶连金,蒋录珍.盾构扩挖地铁车站结构地震反应特性振动台试验[J].岩土力学,2022,43(5):1277-1288. |
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| 作者姓名： | 安军海 陶连金 蒋录珍 |
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| 作者单位： | 1. 河北科技大学 建筑工程学院，河北 石家庄 050018；
2. 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 |
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| 基金项目： | 河北省自然科学基金资助项目（No.E2019208150）；;国家自然科学基金资助项目（No.41877218）；;河北科技大学博士科研启动基金资助项目（No.1181331）~~； |
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| 摘 要： | 开展了近远场地震动作用下盾构扩挖地铁车站结构的振动台试验，分析了砂土模型地基的水平位移、地表变形、加速度、土压力反应及模型结构的加速度、应变等。结果表明：模型地基-结构体系的地震响应对中低频成分发育的地震波反应更为强烈；强震作用下地铁车站结构具有明显的空间效应，地下结构的存在将会改变模型地基表面变形的分布模式。小震时模型结构中柱的加速度反应自下而上逐渐增加，而大震时其反应规律变成先增大后减小；车站结构中板的加速度反应最大、底板次之、顶板最小；小震时，同等深度处模型结构的加速度反应与模型地基土的加速度反应大小相当，侧墙的动土压力自下而上逐渐增大；大震时，模型结构的加速度反应明显大于同深度处模型地基土的加速度反应，动土压力的最大值发生在扩挖隧道的拱肩和中间部位。基于震后模型结构的宏观现象和拉应变幅值，给出了砂土地基中盾构扩挖车站结构的地震损伤演化机制。
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| 关 键 词： | 振动台试验 盾构法车站 地震响应 近远场地震动 |
| 收稿时间： | 2021-08-11 |
| 修稿时间： | 2021-12-24 |
A shaking table-based experimental study on seismic response of a shield- enlarge-dig type subway station structure |
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| AN Jun-hai,TAO Lian-jin,JIANG Lu-zhen.A shaking table-based experimental study on seismic response of a shield- enlarge-dig type subway station structure[J].Rock and Soil Mechanics,2022,43(5):1277-1288. |
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| Authors: | AN Jun-hai TAO Lian-jin JIANG Lu-zhen |
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| Institution: | 1. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China;
2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, 100124, China |
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| Abstract: | A shaking table experiment was conducted on a shield-enlarge-dig type subway station structure in sandy ground subjected to the near field earthquake and the far field earthquake. The horizontal displacement, surface deformation, acceleration, earth pressure response of the model ground and the acceleration and strain of the model structure of sandy soil are analyzed. The measured data substantiate that, the seismic response of soil-structure interaction system is more intense to the ground motion with low-and medium frequency. The subway station structure subjected to strong earthquake motions has obvious spatial effect, and the existence of underground structure will result in a change in the deformation distribution mode of ground surface. The acceleration response of columns of the model structure increases gradually from bottom to top as result of a low-intensity earthquake, while for the high- intensity earthquake, the acceleration response presents a law of increasing first and then decreasing. The acceleration response of the top plate is the biggest, followed by middle plate and bottom plate is the smallest under seismic action. And in addition to this, the acceleration response of the model structure is roughly equal to that of the model soil, and the dynamic earth pressure of the side wall increases gradually from bottom to top as result of the low-intensity earthquake; while for the high-intensity earthquake, the acceleration response of the model structure significantly surpasses that of the model soil, and the maximum value of earth pressure occurs at the arch shoulder and the middle part of the expanded tunnel. The earthquake damage mechanism of the shield-enlarge-dig type subway station structure is given based on the macroscopic phenomena of model structure after shock and the stretching strain amplitude under different ground motions. |
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| Keywords: | shaking table test shield-enlarge-dig type subway station seismic response near and far field earthquake |
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