软弱场地上地铁车站结构近远场地震反应特性振动台试验
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摘要
针对软弱粉质黏土场地条件的三跨三层地铁车站结构,进行近远场地震动作用下土-地下结构动力相互作用振动台模型试验,测试地铁车站结构的加速度、应变反应、水平位移反应和地基土的加速度、震陷及其作用于侧墙的动土压力反应。分析软弱场地土的近远场加速度反应规律、地表震陷特征,结果表明:近、远场地震动作用下,地基土的地震动频谱均呈现出低频放大现象,但其放大效应的程度和频率范围差异较大;由于强地震动作用下地基土发生软化,地基土的地震动频谱特性体现出明显的集中效应;强地震动作用时地基土的基频与远场地震动的主频接近,地基土的地震动放大效应更为显著;地表震陷随输入地震动峰值加速度的增大而增大,但地铁车站结构与土层的竖向相对滑动较小。
According to a subway station structure of three stories and three spans in soft silty clay site,a series of shaking table tests on the dynamic interaction between soil and underground structures under both near and far field ground motion are conducted.In this test,parameters such as acceleration,horizontal displacement,strain response of the station,and the pore water pressure,acceleration,seismic subsidence of soil and dynamic soil pressure on the sidewall are measured.This paper mainly analyzes the acceleration of soil under both near and far field ground motion,also studies the characteristics of the seismic subsidence.The results show that the the frequency spectrum of soils present a amplification phenomenon with low frequency under near and far field motions,however,the degree of amplification effect and frequency range appear to be a great difference.Moreover,the soil softening occurs under strong earthquake and then the spectrum reflects a significant concentration effect.Besides,when it comes to the far-field motions,the values of soil's baseband are approximately equal to the basic frequency of the strong motion,so the amplification effect of the soil seems more significant.In addition,the surface subsidence becomes more serious with the increasing input peak acceleration,while the vertical relative movement between the station structure and soils seems not so obvious.
According to a subway station structure of three stories and three spans in soft silty clay site,a series of shaking table tests on the dynamic interaction between soil and underground structures under both near and far field ground motion are conducted.In this test,parameters such as acceleration,horizontal displacement,strain response of the station,and the pore water pressure,acceleration,seismic subsidence of soil and dynamic soil pressure on the sidewall are measured.This paper mainly analyzes the acceleration of soil under both near and far field ground motion,also studies the characteristics of the seismic subsidence.The results show that the the frequency spectrum of soils present a amplification phenomenon with low frequency under near and far field motions,however,the degree of amplification effect and frequency range appear to be a great difference.Moreover,the soil softening occurs under strong earthquake and then the spectrum reflects a significant concentration effect.Besides,when it comes to the far-field motions,the values of soil's baseband are approximately equal to the basic frequency of the strong motion,so the amplification effect of the soil seems more significant.In addition,the surface subsidence becomes more serious with the increasing input peak acceleration,while the vertical relative movement between the station structure and soils seems not so obvious.
引文
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[8]陈国兴,左熹,王志华,等.地铁车站结构近远场地震反应特性振动台试验[J].浙江大学学报:工学版,2010,44(10):1955-1961(Chen Guoxing,Zuo Xi,Wang Zhihua,et al.Shaking table model test of subway station structure at liquefiable ground under far field and near field ground motion[J].Journal of Zhejiang University:Engineering Science,2010,44(10):1955-1961(in Chinese))
[2]Tamari Y,Towhata I.Seismic soil-structure interaction of cross sections of flexible underground structures subjected to soil liquefaction[J].Soil and Foundation,2003,43(2):69-87
[3]杨林德,季倩倩,郑永来,等.软土地铁车站结构的振动台试验[J].现代隧道技术,2003,40(1):7-11(Yang Linde,Ji Qianqian,Zheng Yonglai,et al.Shaking table test on metro station structures in soft soil[J].Modern Tunnelling Technolog,2003,40(1):7-11(in Chinese))
[4]陈国兴,庄海洋,杜修力,等.土-地铁车站动力相互作用的大型振动台模型试验研究[J].地震工程与工程振动,2007,27(2):171-176(Chen Guoxing,Zhuang Haiyang,Du Xiuli,et al.Analysis of large-scale shaking table test of dynamic soil-subway station interaction[J].Earthquake Engineering and Engineering Vibration,2007,27(2):171-176(in Chinese))
[5]陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台试验——试验结果分析[J].地震工程与工程振动,2007,27(1):164-170(Chen Guoxing,Zhuang Haiyang,Du Xiuli,et al.A large-size shaking table test for dynamic soil-metro tunnel interaction—Analysis on the test results[J].Earthquake Engineering and Engineering Vibration,2007,27(1):164-170(in Chinese))
[6]陈国兴,王志华,左熹,等.振动台试验叠层剪切型土箱的研制[J].岩土工程学报,2010,32(1):89-97(Chen Guoxing,Wang Zhihua,Zuo Xi,et al.Development of laminar shear soil container for shaking table tests[J].Chinese Journal of Geotechnical Engineering,2010,32(1):89-97(in Chinese))
[7]韩晓健,左熹,陈国兴.基于虚拟仪器技术的振动台模型试验98通道动态信号采集系统研制[J].防灾减灾工程学报,2010,30(5):503-508(Han Xiaojian,Zuo Xi,Chen Guoxing.98channels dynamic signal acquisition system development for shaking table test based on virtual instrument technology[J].Journal of Disaster Prevention and Mitgation Engineering,2010,30(5):503-508(in Chinese))
[8]陈国兴,左熹,王志华,等.地铁车站结构近远场地震反应特性振动台试验[J].浙江大学学报:工学版,2010,44(10):1955-1961(Chen Guoxing,Zuo Xi,Wang Zhihua,et al.Shaking table model test of subway station structure at liquefiable ground under far field and near field ground motion[J].Journal of Zhejiang University:Engineering Science,2010,44(10):1955-1961(in Chinese))
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