软土浅埋地铁车站地震响应的多因素影响分析
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摘要
软土浅埋地铁车站结构的抗震能力分析是工程界关注的热点问题之一。为综合评价地震条件下,结构与场地材料性质、地基夹层非均匀性、地震动特性等对地下结构动力响应的影响,作者着重通过非线性时程响应模拟,并辅以时频联合分析技术,从多角度数值研究了软土浅埋地铁车站的地震响应特征与破坏机理。计算中,以DP弹塑性本构模型与接触面单元模型,模拟了土体材料非线性及土体-结构交界面的接触非线性的耦合作用。结果表明,相同地震载荷条件下,近场土体力学参数,及结构交界面处的接触非线性均会对地下结构的受力幅值及分布特征产生明显影响,需要在结构抗震设计中加以综合考虑,而不能单靠提高结构刚度来提高地下结构体的抗震能力。
Seismic response analysis plays an important role in the damage mechanism of shallow underground structure in soft soil medium.By applying the coupling analysis method of DP elastic-plastic constitutive model and nonlinear contacting element model,many influencing factors are numerically investigated in the seismic analysis.In particular,effects on the structural response for the dynamical mechanic characteristics of structure,the soil layer properties and the seismic different time-frequency characteristics are investigated.The signal analysis technique is also employed to study the response characteristic of underground structure.It is demonstrated that such main nonlinear factors have great effects on the earthquake-resistant capacity of the underground structure,which should be comprehensively evaluated during the structural design phase of underground structure.
Seismic response analysis plays an important role in the damage mechanism of shallow underground structure in soft soil medium.By applying the coupling analysis method of DP elastic-plastic constitutive model and nonlinear contacting element model,many influencing factors are numerically investigated in the seismic analysis.In particular,effects on the structural response for the dynamical mechanic characteristics of structure,the soil layer properties and the seismic different time-frequency characteristics are investigated.The signal analysis technique is also employed to study the response characteristic of underground structure.It is demonstrated that such main nonlinear factors have great effects on the earthquake-resistant capacity of the underground structure,which should be comprehensively evaluated during the structural design phase of underground structure.
引文
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[19]谢康和,周健.岩土工程有限元分析理论与应用[M].北京:科学出版社,2002.(XIE Kang-he,ZHOU Jian.Theory and application of FEM ingeotechnical engineering.Beijing:Science Press.2002.(in Chinese))
[20]赵大鹏,宫必宁,晏成明.大跨度地下结构振动性态试验研究[J].重庆建筑大学学报,2002,24(5):52-57.(ZHAO Da-peng,GONG Bi-ning,YANCheng-ming.Experimental analysis of vibration behavior forlarge-span underground structure[J].Journal ofChongqing Jianzhu University,2002,24(5):52-57.(in Chinese))
[2]谷拴成,朱彬,杨鹏.地下结构地震反应非线性分析[J].地下空间与工程学报,2006,2(5):748-752.(GU Shuan-cheng,ZHU Bin,YANG Peng.Nonlinearanalysis of seismic response of underground structure[J].Chinese Journal of Underground Space and Engi-neering,2006,2(5):748-752.(in Chinese))
[3]Samata S,Ohuchi H,Matsuda T.Study of the damageof subway structures during the 1995 Hanshin-Awajiearthquake[J].Cement and Concrete Composites,1997,19(3):223-239.
[4]曹炳政,罗奇峰,马硕,等.神户大开地铁车站的地震反应分析[J].地震工程与工程振动,2002,22(4):102-107.(CAO Bing-zheng,LUO Qi-feng,MAShuo,et al.Seismic response analysis of Dakai subwaystation in hyogoken-nanbu earthquake[J].Earth-quake Engineering and Engineering Vibration,2002,22(4):102-107.(in Chinese))
[5]Hashash Y M A,Hook J J.Schmidt B,et al.Seismicdesign and analysis of underground structures[J].Tun-neling and Underground Space Technology,2001,16(4):247-293.
[6]周健,苏燕,董鹏.软土地层地铁及地下构筑物抗震动力分析研究现状[J].地下空间,2003,23(2):173-178.(ZHOU Jian,SU Yan,DONG Peng.Cur-rent situation of research on earthquake resistance ofsubway and underground structures in soft soil[J].Un-derground Space,2003,23(2):173-178.(in Chi-nese))
[7]周林聪,陈龙珠,宫必宁.地下结构地震模拟振动台试验研究[J].地下空间与工程学报,2005,1(2):182-187.(ZHOULin-cong,CHEN Long-zhu,GONG Bi-ning.Shaking table tests for the seismic Simulation ofunderground Structure[J].Underground Space,2005,1(2):182-187.(in Chinese))
[8]姜忻良,宋丽梅.软土地层中地下隧道结构地震反应分析[J].地震工程与工程振动,1999,19(1):65-69.(JIANG Xin-liang,SONG Li-mei.Seismic re-sponse analysis of underground tunnel in soft soil[J].Earthquake Engineering and Engineering Vibration,1999,19(1):65-69.(in Chinese))
[9]庄海洋,陈国兴,张菁莉.基于子结构法的地铁车站地震反应分析[J].岩土力学,2005,26(增刊):227-231.(ZHUANG Hai-yang,CHEN Guo-xing,ZHANGJing-li.Analysis of earthquake response of subway stationbased on substructuring subtraction methods[J].Rockand Soil Mechanics,2005,26(S1):227-231.(in Chi-nese))
[10]国胜兵,赵毅,赵跃堂,等.地下结构在竖向和水平地震荷载作用下的动力分析[J].地下空间,2002,22(4):314-319.(GUO Sheng-bing,ZHAO Yi,ZHAO Yue-tang.Dynamic analysis of undergroundstructures under the vertical and horizontal seismic load[J].Underground Space,2002,22(4):314-319.(inChinese))
[11]LIU Shu,LIU Jingbo.A method for analyzing three-dimensional dynamic contact problems in visco-elasticmedia with kinetic and static friction[J].Computersand Structures,2003,81(24-25):2383-2394.
[12]杨小礼,李亮.层状地基中交通隧道地震反应分析[J].长沙铁道学院学报,2000,18(4):15-19.(YANG Xiao-li,LI Liang.Seismic response of thetransportation tunnel buried in layered soil[J].Jour-nal of Changsha Railway University.2000,18(4):15-19.(in Chinese))
[13]刘晶波,李彬.地铁地下结构抗震分析及设计中的几个关键问题[J].土木工程学报.2006,39(6):106-110.(LIU Jing-bo,LI Bin.Issues on the seis-mic analysis and design of subway structures[J].Chi-na Civil Engineering Journal.2006,39(6):106-110.(in Chinese))
[14]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.(LIU Jing-bo,LV Yan-dong.A directmethod for analysis of dynamic soil-structure interac-tion[J].China Civil Engineering Journal,1998,31(3):55-64.(in Chinese))
[15]刘晶波,王振宇,杜修力.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.(LIU Jing-bo,WANG Zhen-yu,DU Xiu-li.Three-dimensional visco-elastic artificial boundariesin time domain for wave motion problems[J].Engi-neering Mechanics,2005,22(6):46-51.(in Chi-nese))
[16]边翔.大跨度隧道施工方法数值模拟与动力响应分析研究[D].武汉:武汉理工大学,2005.(BIANXiang.The numerical simulation analytical study onthe construction method and dynamic response for thelong-span tunnel[D].Wuhan:Wuhan University ofTechnology,2005.(in Chinese))
[17]张鸿.基于土-结构动力相互作用理论的地铁隧道抗震的非线性分析[D].天津:天津大学,2004.(ZHANG Hong.Nonlinear analysis of seismic re-sponse of metro tunnel based on soil-structure dynam-ic interaction theory[D].Tianjin:Tianjin University,2004.(in Chinese))
[18]胡志强.考虑坝-地基动力相互作用的有横缝拱坝地震响应分析[D].大连:大连理工大学,2004.(HU Zhi-qiang.Seismic analysis of arch dam with theeffects of constraction joints and dam-foundation in-teraction[D].Dalian:Dalian University of Technolo-gy,2004.(in Chinese))
[19]谢康和,周健.岩土工程有限元分析理论与应用[M].北京:科学出版社,2002.(XIE Kang-he,ZHOU Jian.Theory and application of FEM ingeotechnical engineering.Beijing:Science Press.2002.(in Chinese))
[20]赵大鹏,宫必宁,晏成明.大跨度地下结构振动性态试验研究[J].重庆建筑大学学报,2002,24(5):52-57.(ZHAO Da-peng,GONG Bi-ning,YANCheng-ming.Experimental analysis of vibration behavior forlarge-span underground structure[J].Journal ofChongqing Jianzhu University,2002,24(5):52-57.(in Chinese))
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