砂卵石土在动荷载作用下的阻尼比研究
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摘要
通过对砂卵石土的室内动三轴试验,对饱和砂卵石土的阻尼比动力参数进行深入的研究。主要分析不同围压、不同固结比和不同振动频率对砂卵石土阻尼比影响的变化规律。试验结果表明,动应变对阻尼比有显著影响,阻尼比随着动应变的增大而增大,但随着围压或固结比的增加而减小,同时,阻尼比具有随振动频率的增大而减小的变化规律。
Through laboratory tests on sandy pebble soil by using the dynamic triaxial test,studies of saturated sandy pebble soil was done.It is analyzed the rule of the damping ratio of sandy pebble soil under different confining pressure,consolidation ratio and vibration frequency.The research makes clear that damping ratio markedly rises with the augmentation of dynamic strain,and falls as the enhance of confining pressure or confining pressure ratio.In addition,result also shows that damping ratio reduces with the accretion of vibration frequency.
Through laboratory tests on sandy pebble soil by using the dynamic triaxial test,studies of saturated sandy pebble soil was done.It is analyzed the rule of the damping ratio of sandy pebble soil under different confining pressure,consolidation ratio and vibration frequency.The research makes clear that damping ratio markedly rises with the augmentation of dynamic strain,and falls as the enhance of confining pressure or confining pressure ratio.In addition,result also shows that damping ratio reduces with the accretion of vibration frequency.
引文
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3孙静,袁晓铭.土的动模量和阻尼比研究述评.世界地震工程,2003,19(1):88-95
4 Rollins K M,Evans M D.Shear Modulus and Damping Relationships forGravels.Journal of Ceotechnical and Geoenvironmental Engineering,ASCE,1998,124(5):396-405
5 Kokusho T,Tanaka Y.Geotechnical Dynamic Properties of Gravel LayersInvestigated by In-Situ Freezing Samping//In:Ground Failures UnderSeismic Conditions.Geotechincal Special Publication,ASCE,1993:121-140
6 Seed H B,Idriss I M.Soil Moduli and Damping Factors for DynamicResponse Analysis.Report No.EERC 70-10.Earthquake EngineeringResearch Center.Berkeley,CA,USA:University of California Berkeley,1970:1 329-1 334
7 Hardin B O,Drnevich V P.Shear Modulus and Damping in Soils:Design Equations and Curves.Journal of the Soil Mechanics andFoundation Division,ASCE,1972,98(7):667-692
2孙静.岩土动剪切模量阻尼试验及应用研究:[博士学位论文].哈尔滨:中国地震局工程力学研究所,2004:1-13
3孙静,袁晓铭.土的动模量和阻尼比研究述评.世界地震工程,2003,19(1):88-95
4 Rollins K M,Evans M D.Shear Modulus and Damping Relationships forGravels.Journal of Ceotechnical and Geoenvironmental Engineering,ASCE,1998,124(5):396-405
5 Kokusho T,Tanaka Y.Geotechnical Dynamic Properties of Gravel LayersInvestigated by In-Situ Freezing Samping//In:Ground Failures UnderSeismic Conditions.Geotechincal Special Publication,ASCE,1993:121-140
6 Seed H B,Idriss I M.Soil Moduli and Damping Factors for DynamicResponse Analysis.Report No.EERC 70-10.Earthquake EngineeringResearch Center.Berkeley,CA,USA:University of California Berkeley,1970:1 329-1 334
7 Hardin B O,Drnevich V P.Shear Modulus and Damping in Soils:Design Equations and Curves.Journal of the Soil Mechanics andFoundation Division,ASCE,1972,98(7):667-692
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