软基场地地铁车站地震响应及参数敏感性分析
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摘要
研究目的:为更加全面地探讨软土场地中地铁车站结构地震动力响应特性和灾变机理,分析软基土性参数变化对土体特征点处动孔压比、地铁车站结构特征位置处内力等动力响应指标变化影响规律,本文采用两相介质动力分析方法和多指标综合平衡法对饱和软土地基-地铁车站结构动力相互作用体系进行数值分析与参数敏感性分析,旨在为认识地铁车站结构地震动力灾变机理提供参考。研究结论:(1)结构底板附近存在环状动孔压比峰值区域,引起两侧远场土体向内部侧向流动,对结构底部产生挤压上抬作用;(2)结构体系中底板、剪力墙下端和中柱为受力破坏薄弱部位;(3)软基土性因素中黏聚力对典型动力响应指标影响最为显著,参考体积模量次之;(4)该研究成果可用于指导软土地基地铁车站结构抗震设计。
Research purposes: For the aim to further discuss the seismic response and failure mechanism of interaction system of subway station in saturated soft soil,and investigate the effects of the parameter variation of soft soil properties typical dynamic response indices including excess pore pressure ratio and structural internal forces,both numerical computation and corresponding parametric analyses are conducted by using the dynamic method of two-phase porous media and the method of multi-index comprehensive balance,which can provide reference for the understanding of disaster mechanism and seismic design of subway station in saturated soft soil ground.Research conclusions:( 1) There is an annular peak zone of dynamic pore pressure near the floor plate and the subsoil moves from two flanks which leads to the uplift of subway station.( 2) The middle floor plate,underpart of shear wall and middle column are weak parts during seismic action.( 3) Cohesion of soft soil is the most sensitive soil parameter to typical dynamic response indices and reference bulk modulus takes the second place.( 4) The research results can be employed for guiding the seismic design of subway station surrounded by soft soil.
Research purposes: For the aim to further discuss the seismic response and failure mechanism of interaction system of subway station in saturated soft soil,and investigate the effects of the parameter variation of soft soil properties typical dynamic response indices including excess pore pressure ratio and structural internal forces,both numerical computation and corresponding parametric analyses are conducted by using the dynamic method of two-phase porous media and the method of multi-index comprehensive balance,which can provide reference for the understanding of disaster mechanism and seismic design of subway station in saturated soft soil ground.Research conclusions:( 1) There is an annular peak zone of dynamic pore pressure near the floor plate and the subsoil moves from two flanks which leads to the uplift of subway station.( 2) The middle floor plate,underpart of shear wall and middle column are weak parts during seismic action.( 3) Cohesion of soft soil is the most sensitive soil parameter to typical dynamic response indices and reference bulk modulus takes the second place.( 4) The research results can be employed for guiding the seismic design of subway station surrounded by soft soil.
引文
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[5]邹炎,景立平,崔杰,等.基于可液化场地地震反应数值模拟的影响因素分析[J].防灾减灾工程学报,2015(2):242-248.Zou Yan,Jing Liping,Cui Jie,etc.Factor Analysis Based on Numerical Simulation of Liquefiable Site’s Seismic Responses[J].Journal of Disaster Prevention and Mitigation Engineering,2015(2):242-248.
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[7]Elgamal A,Yang Z,Lai T,etc.Dynamic Response of Saturated Dense Sand in Laminated Centrifuge Container.Journal of Geotechnical and Geoenvironmental Engineering[J].Journal of Geotechnical and Geoenvironmental Engineering,2005(5):598-609.
[8]郑少华,姜奉华.试验设计与数据处理[M].北京:中国建筑工业出版社,2003.Zheng Shaohua,Jiang Fenghua.Experimental Design and Date Processing[M].Beijing:China Architecture&Building Press,2003.
[2]李伟华,赵成刚,杜楠馨.软弱饱和土夹层对地铁车站地震响应的影响分布[J].岩土力学,2010(12):3958-3964.Li Weihua,Zhao Chenggang,Du Nanxin.Analysis of Effects of Saturated Soft Interlayer on Seismic Responses of Metro Station[J].Rock and Soil Mechanics,2010(12):3958-3964.
[3]李培振,崔圣龙,吕西林,等.液化地基自由场振动台试验的土性参数识别[J].同济大学学报:自然科学版,2010(6):791-797.Li Peizhen,Cui Shenglong,Lv Xilin,etc.Parameter Identification of Liquefiable Soil in Free Field Tested on Shaking Table[J].Journal of Tongji University:Natural Science,2010(6):791-797.
[4]Zhang J M,Wang G.Large Post-liquefaction Deformation of Sand,Part I;Physical Mechanism,Constitutive Description and Numerical Algorithm[J].ACTA Geotechnica,2012(2):69-113.
[5]邹炎,景立平,崔杰,等.基于可液化场地地震反应数值模拟的影响因素分析[J].防灾减灾工程学报,2015(2):242-248.Zou Yan,Jing Liping,Cui Jie,etc.Factor Analysis Based on Numerical Simulation of Liquefiable Site’s Seismic Responses[J].Journal of Disaster Prevention and Mitigation Engineering,2015(2):242-248.
[6]Elgamal A.Nonlinear Modeling of Large-scale Ground-foundation-structure Seismic Response[J].ISET Journal of Earthquake Technology,2007(2):325-339.
[7]Elgamal A,Yang Z,Lai T,etc.Dynamic Response of Saturated Dense Sand in Laminated Centrifuge Container.Journal of Geotechnical and Geoenvironmental Engineering[J].Journal of Geotechnical and Geoenvironmental Engineering,2005(5):598-609.
[8]郑少华,姜奉华.试验设计与数据处理[M].北京:中国建筑工业出版社,2003.Zheng Shaohua,Jiang Fenghua.Experimental Design and Date Processing[M].Beijing:China Architecture&Building Press,2003.