多层地铁车站地震动土压力振动台试验研究
吴炜枫1,2朱敏敏1袁勇2
Shaking Table Test Investigation of Seismic Dynamic Soil Pressure of Multi-layer Metro Station
WU WeifengZHU MinminYUAN Yong
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作者信息:1.1.上海市隧道工程轨道交通设计研究院， 200235， 上海；
2.2.同济大学地下建筑与工程系， 200092， 上海
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Affiliation:Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, 200235, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.08.049
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中图分类号/CLCN:TU435∶U231.4
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栏目/Col:其他
摘要:
设计并开展了大比尺地铁振动台试验，研究了不同地震动激励下地铁车站侧墙处的动土压力以及峰值动土压力与地震峰值加速度的相关关系，探讨了车站结构在地震下的运动模式和土结构运动相互作用对动土压力的影响，并将试验结果与传统MononobeOkabe(以下简为“MO”)动土压力理论的计算结果进行了对比分析。结果表明：强震下存在残余土压力，认为是土体进入塑性所致；顶板-底板处侧墙的峰值动土压力相对较大，中板处次之，楼板之间最小；车站侧墙动土压力大小与土体峰值加速度存在正相关；MO方法无法准确预测试验，但被动、主动MO动土压力可用于评估实际动土压力的上、下限值。
Abstracts:
Large-scale metro shaking table test is designed and conducted. The dynamic soil pressure and relation between pressure peak value and seismic peak acceleration on metro station side wall under different seismic excitation is studied. The station structure movement mode under seismic action is discussed, as well as influence of soil-structure relative correlation on dynamic soil pressure. Test result and conventional Mononobe-Okabe (referred to as ′M-O′) dynamic soil pressure theory calculation result are compared and analyzed. Results show that residual soil pressure exists under strong earthquakes, which is believed to be caused by soil entering plasticity. The dynamic soil pressure peak value is found the biggest on the top-bottom slab of side wall, the pressure on mid slab is second to it, and that between floors smallest. Positive correlation exists between station side wall dynamic soil pressure and soil acceleration peak value. M-O method cannot accurately predict the test results. But passive and active M-O dynamic soil pressure can be used to evaluate the upper and lower limits of actual dynamic soil pressure.
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