地层结构对地表地震响应的影响研究
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摘要
以软土地区常见的淤泥质粘土、粉质粘土、粉质粘土夹粉砂三种土性地层概化组成不同地层结构,利用频谱特性差异较大的El-Centro及Concrete地震波,模拟分析地层结构对地表地震响应的影响。获得的地面各类动力响应(加速度时程与峰值、速度时程与峰值、位移时程与峰值、位移残余值、Fourier谱、能量谱、反应谱等)表明,两种地震波作用下地表的地震响应规律性相似,说明地震作用下地层结构的影响具有普遍性;不同的地层结构,地表的地震响应存在差异;从上往下,土层弹性模量依次为高-低-中及中-低-高的地层组合结构的抗震效果较好。场地地震效应影响分析,应将地层结构特性作为地质条件的重要内容予以充分重视。
The common three kinds of earthiness formations(muddy silt clay,silty clay and silty clay clamp silt) in soft soil area,generalized formation the different strata structure,and simulation analysis the formation structure on the influence of surface seismic response by using the spectrum characteristic differences of El-Centro and Concrete seismic wave.Above ground,various forms of dynamic response(acceleration history and peak,speed range and peak,shift schedule and peak,displacement residual value,Fourier spectrum,energy spectrum,response spectrum,etc.) show that the surface seismic response caused by two types of seismic wave is similar,and indicate that the influence of structural formations is universal during earthquakes,so that different stratigraphic configurations create the differences in surface seismic response.From up to down,the seismic effect is good when the soil modulus of elasticity is ordinal in high-low-middle and middle-low-high of stratum composite structure.Analysis of seismic effects at a particular site should pay close attention to the stratigraphic structure and characteristics,as they are a fundamental control on the geological conditions.
The common three kinds of earthiness formations(muddy silt clay,silty clay and silty clay clamp silt) in soft soil area,generalized formation the different strata structure,and simulation analysis the formation structure on the influence of surface seismic response by using the spectrum characteristic differences of El-Centro and Concrete seismic wave.Above ground,various forms of dynamic response(acceleration history and peak,speed range and peak,shift schedule and peak,displacement residual value,Fourier spectrum,energy spectrum,response spectrum,etc.) show that the surface seismic response caused by two types of seismic wave is similar,and indicate that the influence of structural formations is universal during earthquakes,so that different stratigraphic configurations create the differences in surface seismic response.From up to down,the seismic effect is good when the soil modulus of elasticity is ordinal in high-low-middle and middle-low-high of stratum composite structure.Analysis of seismic effects at a particular site should pay close attention to the stratigraphic structure and characteristics,as they are a fundamental control on the geological conditions.
引文
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[15]GB50011-2010,中华人民共和国国家标准:建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.National Standard of PRC:Code for seismic design of buildings(GB50011-2010)[S].Beijing:China Architecture&Building Press,2011.
[2]Kalkan E,Luco N.Special issue on earthquake ground-motionselection and modification for nonlinear dynamic analysis ofstructures[J].Journal of Structural Engineering,2011,137(3):277-286.doi:10.1061/(ASCE)ST.1943-541X.0000355.
[3]Huang Y N,Whittaker A S,Luco N,et al.Scaling earthquakeground motions for performance-based assessment of buildings[J].Journal of Structural Engineering,2011,137(3):311-320.doi:10.1061/(ASCE)ST.1943-541X.0000155.
[4]刘昌森,吕美丽.上海地区地震放大效应的初步探讨[J].上海地质,1998,19(1):7-13.Liu C S,Lu M L.Preliminary analysis of the seismic amplificationeffect in Shanghai[J].Shanghai Geology,1998,19(1):7-13.
[5]高广运,陈青生,何俊锋,等.地下水位上升对上海软土场地地震反应的影响[J].岩土工程学报,2011,33(7):989-996.Gao G Y,Chen Q S,He J F,et al.Effect of rise of groundwater tableon seismic ground response of soft soil in Shanghai[J].ChineseJournal of Geotechnical Engineering,2011,33(7):989-996.
[6]蒋建清,杨果林,李丽民.基于SIMULINK的高填方加筋路堤地震反应分析[J].中南大学学报(自然科学版),2011,42(1):227-233.Jiang J Q,Yang G L,Li L M.Seismic response of high-filledreinforced embankment based on SIMULINK[J].Journal of CentralSouth University(Science and Technology),2011,42(1):227-233.
[7]陈可洋.多尺度随机孔洞介质地震波正演及其逆时成像[J].上海国土资源,2011,32(1):84-88.Chen K Y.Seismic wave forward simulation and reverse-timemigration with multi-scale random carve medium[J].ShanghaiLand&Resources,2011,32(1):84-88.
[8]Takahashi H,Kitazume M,Noguchi T,et al.Seismic-resistant effectof cement-treated soil for quay wall[J].Ground Improvement,2011,164(13):151-160.doi:10.1680/grim.2011.164.3.151.
[9]Hwang G S,Chen C H.Analysis of cases of gravity quaywallmovement during earthquakes[J].Geotechnique,2011,61(3):199-210.doi:10.1680/geot.3625.
[10]杜建国,林皋.地基刚度和不均匀性对混凝土大坝地震响应的影响[J].岩土工程学报,2005,27(7):819-824.Du J G,Lin G.Effect of foundation stiffness and anisotropy onthe seismic response of concrete dams[J].Chinese Journal ofGeotechnical Engineering,2005,27(7):819-824.
[11]蒋建平,刘文白.岩土工程地层结构效应与层组参数[M].北京:人民交通出版社,2011.Jiang J P,Liu W B.The strata structure effect in geotechnicalengineering[M].Beijing:China Communications Press,2011.
[12]张嘎,张建民.地震作用下成层地基中结构物的动力响应[J].清华大学学报(自然科学版),2004,44(12):1642-1645.Zhang G,Zhang J M.Effect of foundation stiffness and anisotropyon the seismic response of concrete dams[J].Journal of TsinghuaUniversity(Science and Technology),2004,44(12):1642-1645.
[13]陈之毅,沈昊.软土地下工程抗震数值模拟的若干关键问题[J].上海国土资源,2011,32(4):83-87.Chen Z Y,Shen H.Key issues for seismic analysis of undergroundstructures in soft soils[J].Shanghai Land&Resources,2011,32(4):83-87.
[14]Okamura M,Tamamura S.Seismic stability of embankment on softsoil deposit[J].International Journal of Physical Modelling inGeotechnics,2011,11(2):50-57.doi:10.1680/ijpmg.2011.11.2.50.
[15]GB50011-2010,中华人民共和国国家标准:建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.National Standard of PRC:Code for seismic design of buildings(GB50011-2010)[S].Beijing:China Architecture&Building Press,2011.
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