可液化地基中地铁车站周围场地地震反应分析
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摘要
地基液化是地铁车站结构在地震中发生严重震害的重要威胁之一。基于对砂土液化大变形本构模型的研究,建立了可液化地基–地铁车站结构非线性静动力耦合相互作用分析模型,分析了该相互作用体系的地震反应规律。首先,对地铁车站结构周围地基的动孔隙水压力、位移和加速度的时空分布规律进行了分析,重点分析了可液化地基上车站结构上浮、周围侧向地基地表的地震沉降、车站结构周围地基的液化区分布特性及其位移矢量场特征;其次,对车站结构周围可液化地基的地震反应对地面结构的地基稳定性及其所处地震环境的影响进行了初步研究,研究成果可对控制可液化地基上地铁车站结构地基的震害及其对地面结构造成的震害影响提供科学依据和参考。
The liquefiable foundation of the subway station may bring severe seismic damages to it.Accordingly,a nonlinear model for the liquefiable foundation-subway station interaction is constituted to calculate the large liquefaction deformation by using the constitutive model for sand.The space-time transformation of the dynamic pore pressure,the displacement and the acceleration of the liquefiable foundation are analyzed.The ascent of the subway station and the dynamic settlement of the side foundation are investigated.The distributions of liquefaction area and the displacement vectors of the foundation around the subway station are analyzed.The research findings can be helpful for analyzing the earthquake damages of liquefiable foundation around the underground structures or the ground structures.
The liquefiable foundation of the subway station may bring severe seismic damages to it.Accordingly,a nonlinear model for the liquefiable foundation-subway station interaction is constituted to calculate the large liquefaction deformation by using the constitutive model for sand.The space-time transformation of the dynamic pore pressure,the displacement and the acceleration of the liquefiable foundation are analyzed.The ascent of the subway station and the dynamic settlement of the side foundation are investigated.The distributions of liquefaction area and the displacement vectors of the foundation around the subway station are analyzed.The research findings can be helpful for analyzing the earthquake damages of liquefiable foundation around the underground structures or the ground structures.
引文
[1]刘华北,宋二祥.埋深对地下结构地震液化响应的影响[J].清华大学学报(自然科学版),2005,45(3):301–305.(LIU Hua-bei,SONG Er-xiang.Effects of burial depth on the liquefaction response of underground structures during an earthquake excitation[J].J Tsinghua Univ(Sci&Tech),2005,45(3):301–305.(in Chinese))
[2]刘华北,宋二祥.可液化土中地铁结构的地震响应[J].岩土力学,2005,26(3):381–391.(LIU Hua-bei,SONG Er-xiang.Earthquake induced liquefaction response of subway structure in liquefiable soil[J].Rock and Soil Mechanics,2005,26(3):381–391.(in Chinese))
[3]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及其试验验证[J].岩土工程学报,2007,29(2):1815–1822.(LIU Guang-lei,SONG Er-xiang,LIU Hua-bei.Numerical modeling of subway tunnels in liquefiable soil under earthquakes and verification by centrifuge tests[J].Chinese Journal of Geotechnical Engineering,2007,29(2):1815–1822.(in Chinese))
[4]刘光磊,宋二祥,刘华北,等.饱和砂土地层中隧道结构动力离心模型试验[J].岩土力学,2008,29(8):2070–2076.(LIU Guang-lei,SONG Er-xiang,LIU Hua-bei,et al.Dynamic centrifuge tests on seismic response of tunnel in 88岩土工程学报2012年saturated sandy foundation[J].Rock and Soil Mechanics,2008,29(8):2070–2076.(in Chinese))
[5]陈国兴,左熹,王志华,等.近远场地震作用下液化地基上地铁车站结构动力损伤特性的振动台试验[J].土木工程学报,2010,43(12):120–126.(CHEN Guo-xing,ZUO Xi,WANG Zhi-hua,et al.Large scale shaking table test study of the dynamic damage behavior of subway station structures in liquefiable foundation under near-fault and far-field ground motions[J].China Civil Engineering Journal,2010,43(12):120–126.(in Chinese))
[6]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 Guo-xing,ZUO Xi,WANG Zhi-hua,et al.Shaking table model test of subway station structure under far field and near field ground motion[J].Journal of Zhejiang University(Engineering Science),2010,44(10):1955–1961.(in Chinese))
[7]YANG Zhao-hui,AHMED Elgamal.Influence of permeability on liquefaction-induced shear deformation[J].Journal of Engineering Mechanics,2002,128(7):720–729.
[8]AHMED Elgamal,YANG Zhao-hui,PARRA Ender.Properties of a phase-conjugate etalon mirror and its application to laser resonator spatial-mode control[J].Soil Dynamics and Earthquake Engineering,2002,22(4):259–271.
[9]庄海洋,陈国兴.对土体动力黏塑性记忆型嵌套面模型的改进[J].岩土力学,2009,30(1):118–122.(ZHUANG Hai-yang,CHEN Guo-xing.Father analysis on the dynamic viscous-plastic memorial nested yield surface model of soil[J].Rock and Soil Mechanics,2009,30(1):118–122.(in Chinese))
[10]庄海洋,吴祥祖,陈国兴.考虑初始静应力状态的土–地下结构非线性静动力相互作用研究[J].岩石力学与工程学报,2011,30(增刊1):3112–3119.(ZHUANG Hai-yang,WU Xiang-zu,CHEN Guo-xing.Study on the soil-underground structure static&dynamic coupling nonlinear interaction[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(S1):3112–3119.(in Chinese))
[11]庄海洋,黄春霞,左玉峰.某砂土液化大变形本构模型参数的敏感性分析[J].岩土力学,2012,33.(ZHUANG Hai-yang,HUANG Chun-xia,ZUO Yu-feng.The sensitivity analysis of model parameters for predicting the large liquefaction deformation of sand[J].Rock and Soil Mechanics,2012,33.(in Chinese))
[12]庄海洋.土–地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.(ZHUANG Hai-yang.Study on nonlinear dynamic soil-underground structure interaction and its large-size shaking table tests[D].Nanjing:Nanjing University of Technology,2006.(in Chinese))
[13]GB50007—2002地基基础设计规范[S].2002.(GB50007—2002 Foundation design code[S].2002.(in Chinese))
[2]刘华北,宋二祥.可液化土中地铁结构的地震响应[J].岩土力学,2005,26(3):381–391.(LIU Hua-bei,SONG Er-xiang.Earthquake induced liquefaction response of subway structure in liquefiable soil[J].Rock and Soil Mechanics,2005,26(3):381–391.(in Chinese))
[3]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及其试验验证[J].岩土工程学报,2007,29(2):1815–1822.(LIU Guang-lei,SONG Er-xiang,LIU Hua-bei.Numerical modeling of subway tunnels in liquefiable soil under earthquakes and verification by centrifuge tests[J].Chinese Journal of Geotechnical Engineering,2007,29(2):1815–1822.(in Chinese))
[4]刘光磊,宋二祥,刘华北,等.饱和砂土地层中隧道结构动力离心模型试验[J].岩土力学,2008,29(8):2070–2076.(LIU Guang-lei,SONG Er-xiang,LIU Hua-bei,et al.Dynamic centrifuge tests on seismic response of tunnel in 88岩土工程学报2012年saturated sandy foundation[J].Rock and Soil Mechanics,2008,29(8):2070–2076.(in Chinese))
[5]陈国兴,左熹,王志华,等.近远场地震作用下液化地基上地铁车站结构动力损伤特性的振动台试验[J].土木工程学报,2010,43(12):120–126.(CHEN Guo-xing,ZUO Xi,WANG Zhi-hua,et al.Large scale shaking table test study of the dynamic damage behavior of subway station structures in liquefiable foundation under near-fault and far-field ground motions[J].China Civil Engineering Journal,2010,43(12):120–126.(in Chinese))
[6]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 Guo-xing,ZUO Xi,WANG Zhi-hua,et al.Shaking table model test of subway station structure under far field and near field ground motion[J].Journal of Zhejiang University(Engineering Science),2010,44(10):1955–1961.(in Chinese))
[7]YANG Zhao-hui,AHMED Elgamal.Influence of permeability on liquefaction-induced shear deformation[J].Journal of Engineering Mechanics,2002,128(7):720–729.
[8]AHMED Elgamal,YANG Zhao-hui,PARRA Ender.Properties of a phase-conjugate etalon mirror and its application to laser resonator spatial-mode control[J].Soil Dynamics and Earthquake Engineering,2002,22(4):259–271.
[9]庄海洋,陈国兴.对土体动力黏塑性记忆型嵌套面模型的改进[J].岩土力学,2009,30(1):118–122.(ZHUANG Hai-yang,CHEN Guo-xing.Father analysis on the dynamic viscous-plastic memorial nested yield surface model of soil[J].Rock and Soil Mechanics,2009,30(1):118–122.(in Chinese))
[10]庄海洋,吴祥祖,陈国兴.考虑初始静应力状态的土–地下结构非线性静动力相互作用研究[J].岩石力学与工程学报,2011,30(增刊1):3112–3119.(ZHUANG Hai-yang,WU Xiang-zu,CHEN Guo-xing.Study on the soil-underground structure static&dynamic coupling nonlinear interaction[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(S1):3112–3119.(in Chinese))
[11]庄海洋,黄春霞,左玉峰.某砂土液化大变形本构模型参数的敏感性分析[J].岩土力学,2012,33.(ZHUANG Hai-yang,HUANG Chun-xia,ZUO Yu-feng.The sensitivity analysis of model parameters for predicting the large liquefaction deformation of sand[J].Rock and Soil Mechanics,2012,33.(in Chinese))
[12]庄海洋.土–地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.(ZHUANG Hai-yang.Study on nonlinear dynamic soil-underground structure interaction and its large-size shaking table tests[D].Nanjing:Nanjing University of Technology,2006.(in Chinese))
[13]GB50007—2002地基基础设计规范[S].2002.(GB50007—2002 Foundation design code[S].2002.(in Chinese))
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