振动台试验模型地基土的设计与试验研究
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摘要
本文在动力相似关系的分析基础之上,设计了一种以锯末为主要成分,用于地基-基础-上部结构动力相互作用振动台试验的模型土。用循环单剪仪对原型土和设计的模型土分别进行了试验,得出了2者的动剪切模量比Gd/Gdm ax和阻尼比λ随动剪应变γd变化的关系曲线,对两种土的动力特性进行了相似对比。试验结果表明,设计的模型土与原型土的动力特性具有较好的相似性。采用等效线性本构模型,给出了原型土和模型土的动力特性参数。对采用本文所设计的模型土进行振动台试验的动力相似问题进行了初步讨论。
On the basis of dynamic similitude analysis,a model soil which is mainly composed of sawdust and aimed to be used in the shaking table test of the soil-foundation-structure system is designed.Cyclic simple shear testings have been conducted on the specimens of both the site soil and designed soil,and the curves of dynamic shear modulus ratio G/G_(max) and damping ration λ versus dynamic shear strain γ for both the site soils and the designed model soils are presented.The comparison of these curves between the field soil and the designed model soil is made,which indicates that the dynamic characteristics of those are of good similarity.Both the site soil and the designed model soil regarded as a visco-elastic body are studied by means of an equivalent linear model,and the corresponding parameters are presented.Lastly,the question of dynamic similitude between the prototype system and the model system,using the designed soil as foundation soil of the model system,is discussed generally.
On the basis of dynamic similitude analysis,a model soil which is mainly composed of sawdust and aimed to be used in the shaking table test of the soil-foundation-structure system is designed.Cyclic simple shear testings have been conducted on the specimens of both the site soil and designed soil,and the curves of dynamic shear modulus ratio G/G_(max) and damping ration λ versus dynamic shear strain γ for both the site soils and the designed model soils are presented.The comparison of these curves between the field soil and the designed model soil is made,which indicates that the dynamic characteristics of those are of good similarity.Both the site soil and the designed model soil regarded as a visco-elastic body are studied by means of an equivalent linear model,and the corresponding parameters are presented.Lastly,the question of dynamic similitude between the prototype system and the model system,using the designed soil as foundation soil of the model system,is discussed generally.
引文
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[5]陈国兴,陈继华,王志华,等.土-结构-TMD体系振动台模型试验与数值模拟对比研究[J].岩土工程学报,2003,25(5):532~537.
[6]Lew is,M ichael J,B laney,et al.D esign and testing of a synthetic clay soil[J].Geotechn ical Testing Journal,1990,13(4):269~279.
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[8]李广信.高等土力学[M].北京:清华大学出版社,2004.
[9]彭社琴,赵其华,黄润秋.成都粘土动三轴试验研究[J].地质灾害与环境保护,2002,13(1):57~60.
[10]任慧.场地动力反应的理论分析与场地土动力特性试验研究[D].长沙:湖南大学,2004.
[2]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20~29.
[3]楼梦麟,王文剑,马恒春,等.土-桩-结构相互作用体系的振动台模型试验[J].同济大学学报(自然科学版),2001,29(7):763~768.
[4]陈国兴,王志华,宰金珉.考虑土与结构相互作用效应的结构减震控制大型振动台模型试验研究[J].地震工程与工程振动,2001,21(4):117~127.
[5]陈国兴,陈继华,王志华,等.土-结构-TMD体系振动台模型试验与数值模拟对比研究[J].岩土工程学报,2003,25(5):532~537.
[6]Lew is,M ichael J,B laney,et al.D esign and testing of a synthetic clay soil[J].Geotechn ical Testing Journal,1990,13(4):269~279.
[7]Boyce L,Kana D D.Scale model study of p ile foundations under earthquake excitation[J].Journal of Energy Resource Technology,TransactionofASME,1993,115(1):47~55.
[8]李广信.高等土力学[M].北京:清华大学出版社,2004.
[9]彭社琴,赵其华,黄润秋.成都粘土动三轴试验研究[J].地质灾害与环境保护,2002,13(1):57~60.
[10]任慧.场地动力反应的理论分析与场地土动力特性试验研究[D].长沙:湖南大学,2004.
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