软土地区中庭式地铁车站动土正应力分布规律
张志明1,2郭宗程1袁勇3
Distribution Law of Dynamic Soil Normal Stress of Atrium-style Metro Station in Soft Soil Area
ZHANG ZhimingGUO ZongchengYUAN Yong
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作者信息:1.1.贵州大学土木工程学院， 550025， 贵阳；
2.2.贵州省岩土力学与工程安全重点实验室， 550025， 贵阳；
3.3.同济大学土木工程防灾国家重点实验室， 200092， 上海
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Affiliation:School of Civil Engineering, Guizhou University, 550025, Guiyang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.08.045
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中图分类号/CLCN:TU435∶U231.4;TU471.8
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栏目/Col:其他
摘要:
依托上海某中庭式地铁车站工程，开展了谐波激励及地震波激励下的土地铁车站模型振动台试验。采集了车站侧墙动土正应力数据，分析了车站侧墙动土正应力的时程、实时分布和峰值分布等响应特征。试验结果显示，在谐波激励下，侧墙动土正应力时程具有周期性，其时程的频率与输入谐波的频率一致；在地震波激励下，侧墙动土正应力时程仍具有周期性，其时程的一阶卓越频率与场地的一阶卓越频率一致；在同一时刻、同一埋深处，车站左、右侧墙的动土正应力绝对值相差很小，呈一拉一压的状态；侧墙动土正应力峰值整体呈近似L形分布，最大应力发生在侧墙底。
Abstracts:
Based on certain atrium-style metro station project in Shanghai, shaking table test is carried out on a soil-station model under excitation of both harmonic and seismic waves. Station side wall dynamic soil normal stress data is collected. Response characteristics such as time-history, real-time distribution, peak value distribution of the normal stress are analyzed. Test results show that under harmonic excitation, there is periodicity in the time-history of side wall dynamic soil normal stress, and the frequency of time-history is consistent with that of the input harmonic wave. Under seismic wave excitation, periodicity exists as well, and the first predominant frequency of the time-history is consistent with that of the site. At the same moment and the same buried depth, the absolute value of dynamic soil normal stress barely makes difference between on left or right side wall, showing compression on one side and tension on the other. Peak value presents an approximate L-shaped distribution along the side wall, and the maximum stress occurs at the wall bottom.
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