加荷频率对土体动力特性影响的试验分析
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摘要
通过在不同的振动频率情况下,试验场地土的应力-应变曲线、动模量曲线和阻尼比曲线与振动频率的关系,讨论了振动频率对粘性土的动力特性的影响。结果表明:在这4种频率作用下,粘性土的动本构关系均服从双曲线模型;振动频率在应变较小时对土的动模量影响较小、在应变较大时影响较大;振动频率对于粘性土的阻尼比则具有较大的影响。
Based on the different vibration frequencies,the relationship between vibration frequency and clay stress-strain curve,dynamic shear modulus curve and damping ratio curve have been studied,and the influence of vibration frequency on clay dynamic property has been discussed.The result shows that:under the influence of the above four frequencies,clay dynamic constitutive relationship all conform to double curve model; vibration frequency has greater influence on dynamic shear modulus of the soil when the strain is strong,and less one when the strain is weak; but it has a great influence on clay damping ratio.
Based on the different vibration frequencies,the relationship between vibration frequency and clay stress-strain curve,dynamic shear modulus curve and damping ratio curve have been studied,and the influence of vibration frequency on clay dynamic property has been discussed.The result shows that:under the influence of the above four frequencies,clay dynamic constitutive relationship all conform to double curve model; vibration frequency has greater influence on dynamic shear modulus of the soil when the strain is strong,and less one when the strain is weak; but it has a great influence on clay damping ratio.
引文
1 张建明,王稳祥.振动频率对饱和砂土动力特性的影响[J].岩土工程学报,1990,12(1) :89-97
2 刘公社,巫志辉.振动频率对强夯黄土动力特性的影响[A].第四届全国土动力学术会议论文集.杭州:浙江大学出版社,1994
3 R.D.Woods,土壤动力性能的测定.地震工程与土动力问题译文集.北京:地震出版社,1985
4 王海东,尚守平,卢华喜等.场地土动剪模量的试验对比研究[J].湖南:湖南大学学报,2005,32(3)
5 谢定义,土动力学[M].西安:西安交通大学出版社,1988
2 刘公社,巫志辉.振动频率对强夯黄土动力特性的影响[A].第四届全国土动力学术会议论文集.杭州:浙江大学出版社,1994
3 R.D.Woods,土壤动力性能的测定.地震工程与土动力问题译文集.北京:地震出版社,1985
4 王海东,尚守平,卢华喜等.场地土动剪模量的试验对比研究[J].湖南:湖南大学学报,2005,32(3)
5 谢定义,土动力学[M].西安:西安交通大学出版社,1988
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