软粘土的地震行为研究
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摘要
通过开展离心机动力试验,揭示了从基岩输出的地震波经过一定厚度的软粘土层传播到地表时,地震波高频成分将被过滤,地表运动的周期将变长,反映出土体在地震荷载的持续作用下将发生一定程度的软化,同时在一定的周期范围内,加速度反应谱幅值将得到不同程度的放大;最后开展了ABAQUS计算和理论分析以验证试验结论的合理性。该研究为自由场土体地震反应的基础性研究,成果对于结构抗震设计中场地选择以及土结动力相互作用研究具有一定的参考价值。
By conducting centrifuge shaking table tests,revealed that when seismic wave originated from rock bed is transmitted to clay surface,high frequency components are filtered,and the effects of modulus reduction and stiffness degradation are manifested as an increase in the resonance periods of the clay layers with the level of shaking and with successive earthquakes.And during a range of period,spectral accelerations amplified in different degrees.Then ABAQUS back analysis and theoretical analyses are carried out to verify the results of centrifuge tests.This study is a basic research in the field of soil seismic response;the results can be referred for site choice of structure seismic resistant design and study of soil-structure dynamic interaction.
By conducting centrifuge shaking table tests,revealed that when seismic wave originated from rock bed is transmitted to clay surface,high frequency components are filtered,and the effects of modulus reduction and stiffness degradation are manifested as an increase in the resonance periods of the clay layers with the level of shaking and with successive earthquakes.And during a range of period,spectral accelerations amplified in different degrees.Then ABAQUS back analysis and theoretical analyses are carried out to verify the results of centrifuge tests.This study is a basic research in the field of soil seismic response;the results can be referred for site choice of structure seismic resistant design and study of soil-structure dynamic interaction.
引文
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[2]Vucetic M and Dobry R.Degradation of Marine Claysunder Cyclic Loading[J].Journal of the GeotechnicalEngineering Division,ASCE,1988,114(2):133～149
[3]Ishihara K.Soil Behavior in Earthquake Geotechnics[M].Clarendon Press,Oxford,1996
[4]Teachavorasinskun S,Thongchim P and LukkunaprasitP.Shear Modulus and Damping Ratio of a Clay DuringUndrained Cyclic Loading[J].Geotechnique,2001,51(5):467～470
[5]谢定义.土动力学[M].西安:西安交通大学出版社,1987Xie Ding-yi.Soil Dynamics[M].Xi'an:Xi'an Jiao TongUniversity Press,1987(in Chinese)
[6]Banerjee S,Goh S H and Lee F H.Response of SoftClay Strata and Clay-Pile-R Systems to Seismic Shaking[J].Journal of Earthquake and Tsunami,2007,1(3):233～255
[7]马亢.地震条件下桩筏基础与土的动力相互作用机理研究[D].成都:四川大学,2010Ma Kang.Dynamic Pile-Raft-Soil Interaction in SoftClay condition during earthquakes[D].Chengdu:Doctoral Dissertation of Sichuan University,2010(inChinese)
[8]Zhao P.Centrifuge Modelling of Seismic Amplification inSome Singapore Soil Conditions[D].National Universityof Singapore,1999
[9]Niu J X.Centrifuge Modelling of Earthquake Effects onSand and Soft Clay Strata[D].National University ofSingapore,1997
[10]Yu Y and Lee F H.Seismic Response of Soft Ground[A].Proceedings of Physical Modelling in Geotechnics-ICPMG’02[C].St.Jhon’s,Canada,519～524
[11]Snyder J L.Full Scale Test Lateral Load Tests of a 3x5Pile Group in Soft Clays and Silts[D].Brigham YoungUniversity,USA,2004
[12]Vucetic M.Normalised Behaviour of Offshore Clayunder Uniform Cyclic Loading[J].CanadianGeotechnical Journal,1988,25:33～41
[13]Viggiani G and Atkinson J H.Stiffness of Fine-grainedSoils at Very Small Strains[J].Geotechnique,1995,45(2):249～265
[14]Elly Tenando.Strength Properties and Mineralogy ofSingapore Old Alluvium[D].National University ofSingapore,2003.
[2]Vucetic M and Dobry R.Degradation of Marine Claysunder Cyclic Loading[J].Journal of the GeotechnicalEngineering Division,ASCE,1988,114(2):133～149
[3]Ishihara K.Soil Behavior in Earthquake Geotechnics[M].Clarendon Press,Oxford,1996
[4]Teachavorasinskun S,Thongchim P and LukkunaprasitP.Shear Modulus and Damping Ratio of a Clay DuringUndrained Cyclic Loading[J].Geotechnique,2001,51(5):467～470
[5]谢定义.土动力学[M].西安:西安交通大学出版社,1987Xie Ding-yi.Soil Dynamics[M].Xi'an:Xi'an Jiao TongUniversity Press,1987(in Chinese)
[6]Banerjee S,Goh S H and Lee F H.Response of SoftClay Strata and Clay-Pile-R Systems to Seismic Shaking[J].Journal of Earthquake and Tsunami,2007,1(3):233～255
[7]马亢.地震条件下桩筏基础与土的动力相互作用机理研究[D].成都:四川大学,2010Ma Kang.Dynamic Pile-Raft-Soil Interaction in SoftClay condition during earthquakes[D].Chengdu:Doctoral Dissertation of Sichuan University,2010(inChinese)
[8]Zhao P.Centrifuge Modelling of Seismic Amplification inSome Singapore Soil Conditions[D].National Universityof Singapore,1999
[9]Niu J X.Centrifuge Modelling of Earthquake Effects onSand and Soft Clay Strata[D].National University ofSingapore,1997
[10]Yu Y and Lee F H.Seismic Response of Soft Ground[A].Proceedings of Physical Modelling in Geotechnics-ICPMG’02[C].St.Jhon’s,Canada,519～524
[11]Snyder J L.Full Scale Test Lateral Load Tests of a 3x5Pile Group in Soft Clays and Silts[D].Brigham YoungUniversity,USA,2004
[12]Vucetic M.Normalised Behaviour of Offshore Clayunder Uniform Cyclic Loading[J].CanadianGeotechnical Journal,1988,25:33～41
[13]Viggiani G and Atkinson J H.Stiffness of Fine-grainedSoils at Very Small Strains[J].Geotechnique,1995,45(2):249～265
[14]Elly Tenando.Strength Properties and Mineralogy ofSingapore Old Alluvium[D].National University ofSingapore,2003.
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