筑坝反滤料动模量和阻尼比影响因素的数值模拟研究
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摘要
土体动模量和阻尼比是动力学特性的重要表征参数,在工程抗震分析中起到不可或缺的作用。在对动模量和阻尼比试验成功模拟的基础上,改变数值模型中相应的试验条件,探讨了试验中土体动模量和阻尼比的影响因素固结比、围压、试样级配、试样密实度和动应力频率。结果表明:筑坝反滤料的固结比对动模量的影响比较符合Hardin推导公式的结果;最大动模量与围压呈正比;随着密实度的降低,最大动模量亦降低;动应力频率对动模量和阻尼比基本无影响。
Dynamic shear modulus and damping ratio are important characteristic parameters of soil dynamic property.They play an indispensable role in earthquake resistance research.Through simulating the dynamic shear modulus and damping ratio test by PFC,the influencing factors of dynamic shear modulus and damping ratio of filter,including the consolidation ratio,confining pressure,compactness,graduation and oscillation frequency,were discussed by changing the test condition.Results show that the effect of filter consolidation ratios on maximal shear modulus agrees with the results of Hardin formula.The maximal dynamic shear modulus is proportional to the confining pressure.Dynamic stress frequency nearly has no influence on dynamic shear modulus and damping ratio.
Dynamic shear modulus and damping ratio are important characteristic parameters of soil dynamic property.They play an indispensable role in earthquake resistance research.Through simulating the dynamic shear modulus and damping ratio test by PFC,the influencing factors of dynamic shear modulus and damping ratio of filter,including the consolidation ratio,confining pressure,compactness,graduation and oscillation frequency,were discussed by changing the test condition.Results show that the effect of filter consolidation ratios on maximal shear modulus agrees with the results of Hardin formula.The maximal dynamic shear modulus is proportional to the confining pressure.Dynamic stress frequency nearly has no influence on dynamic shear modulus and damping ratio.
引文
[1]Li W,Lei L,Wang D,et al.Investigation on the dynamic shear modulus and damping ratio of steel slag sand mixtures[J].Construction and Building Materials,2018,162:170-180.
[2]Lin B,Zhang F,Feng D Ch,et al.Dynamic shear modulus and damping ratio of thawed saturated clay under long-term cyclic loading[J].Cold Regions Science and Technology,2018,145:93-105.
[3]Cundall P A,Strack O D L.A discrete numerical model for granular assembles[J].Gotechnique,1979,29(1):47-65.
[4]刘汉龙,杨贵,陈育民.筑坝反滤料动剪切模量和阻尼比影响因素试验研究[J].岩土力学,2010,31(7):2 030-2 034,2 039.Liu H L,Yang G,Chen Y M.Experimental study of factors influencing dynamic shear modulus and damping ratio of dam inverted filler[J].Rock and Soil Mechanics,2010,31(7):2 030-2 034,2 039.(in Chinese)
[5]刘汉龙,高德清,陈育民,等.筑坝反滤料动模量和阻尼比试验的颗粒流模拟[J].防灾减灾工程学报,2009,29(4):361-367.Liu H L,Gao D Q,Chen Y M,et al.Simulation of dynamic modulus and damping ratio test on filter material by particle flow code[J].Journal of Disaster Prevention and Mitigation Engineering,2009,29(4):361-367.(in Chinese)
[6]Cundall P A,Strack O D L.Particle flow code in 2dimensions[M].America:Itasca Consulting Group Press,1999.
[7]孙静,袁晓铭.固结比对砂土动剪切模量及地表反应谱的影响[J].岩土力学,2007,28(3):443-454.Sun J,Yuan X M.Effects of consolidation ratios of sands on dynamic shear modulus and response spectrum of soil surface[J].Rock and Soil Mechanics,2007,28(3):443-454.(in Chinese)
[8]Hardin B O,Black W L.Vibration modulus of normally consolidated clay[J].Journal of Soil Mechanics and Foundations Division,ASCE,1968,94(2):353-369.
[9]郭婷婷.固结比对粉质黏土动力学特性影响的试验研究[J].地球物理学进展,2016,31(6):2 729-2 734.Guo T T.Testing study of effects of consolidation ratios of soils on dynamic characteristics[J].Progress in Geophysics,2016,31(6):2 729-2 734.(in Chinese)
[10]蒋通,邢海灵.围压对土动剪切模量和阻尼比影响的简化计算方法[J].岩石力学与工程学报,2007,26(7):1 432-1 437.Jiang T,Xing H L.A simple method considering effects of confining pressure on dynamic shear and damping ratio[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(7):1 432-1 437.(in Chinese)
[11]李瑞山,陈龙伟,袁晓铭,等.荷载频率对动模量阻尼比影响的试验研究[J].岩土工程学报,2017,39(1):71-80.Li R Sh,Chen L W,Yuan X M,et al.Experimental study on influences of different loading frequencies on dynamic modulus and damping ratio[J].Chinese Journal of Geotechnical Engineering,2017,39(1):71-80.(in Chinese)
[12]郭文,李强,王汝恒.振动频率对饱和砂卵石土动模量和动阻尼比影响的试验研究[J].四川建筑科学研究,2007,33(6):113-115.Guo W,Li Q,Wang R H.Experimental study on influence of vibration frequency on dynamic modulus and damping ratio characteristics of saturated sandy pebble soil[J].Sichuan Building Science,2007,33(6):113-115.(in Chinese)
[13]杨贵,刘汉龙,高德清.加载频率对反滤料动变形特性影响的试验及细观数值模拟研究[J].岩土力学,2011,32(增1):419-423.Yang G,Liu H L,Gao D Q.Study of test and mesomechanical simulation of influence of vibration frequency on dynamic deformation property of inverted filler[J].Rock and Soil Mechanics,2011,32(Sup 1):419-423.(in Chinese)
[2]Lin B,Zhang F,Feng D Ch,et al.Dynamic shear modulus and damping ratio of thawed saturated clay under long-term cyclic loading[J].Cold Regions Science and Technology,2018,145:93-105.
[3]Cundall P A,Strack O D L.A discrete numerical model for granular assembles[J].Gotechnique,1979,29(1):47-65.
[4]刘汉龙,杨贵,陈育民.筑坝反滤料动剪切模量和阻尼比影响因素试验研究[J].岩土力学,2010,31(7):2 030-2 034,2 039.Liu H L,Yang G,Chen Y M.Experimental study of factors influencing dynamic shear modulus and damping ratio of dam inverted filler[J].Rock and Soil Mechanics,2010,31(7):2 030-2 034,2 039.(in Chinese)
[5]刘汉龙,高德清,陈育民,等.筑坝反滤料动模量和阻尼比试验的颗粒流模拟[J].防灾减灾工程学报,2009,29(4):361-367.Liu H L,Gao D Q,Chen Y M,et al.Simulation of dynamic modulus and damping ratio test on filter material by particle flow code[J].Journal of Disaster Prevention and Mitigation Engineering,2009,29(4):361-367.(in Chinese)
[6]Cundall P A,Strack O D L.Particle flow code in 2dimensions[M].America:Itasca Consulting Group Press,1999.
[7]孙静,袁晓铭.固结比对砂土动剪切模量及地表反应谱的影响[J].岩土力学,2007,28(3):443-454.Sun J,Yuan X M.Effects of consolidation ratios of sands on dynamic shear modulus and response spectrum of soil surface[J].Rock and Soil Mechanics,2007,28(3):443-454.(in Chinese)
[8]Hardin B O,Black W L.Vibration modulus of normally consolidated clay[J].Journal of Soil Mechanics and Foundations Division,ASCE,1968,94(2):353-369.
[9]郭婷婷.固结比对粉质黏土动力学特性影响的试验研究[J].地球物理学进展,2016,31(6):2 729-2 734.Guo T T.Testing study of effects of consolidation ratios of soils on dynamic characteristics[J].Progress in Geophysics,2016,31(6):2 729-2 734.(in Chinese)
[10]蒋通,邢海灵.围压对土动剪切模量和阻尼比影响的简化计算方法[J].岩石力学与工程学报,2007,26(7):1 432-1 437.Jiang T,Xing H L.A simple method considering effects of confining pressure on dynamic shear and damping ratio[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(7):1 432-1 437.(in Chinese)
[11]李瑞山,陈龙伟,袁晓铭,等.荷载频率对动模量阻尼比影响的试验研究[J].岩土工程学报,2017,39(1):71-80.Li R Sh,Chen L W,Yuan X M,et al.Experimental study on influences of different loading frequencies on dynamic modulus and damping ratio[J].Chinese Journal of Geotechnical Engineering,2017,39(1):71-80.(in Chinese)
[12]郭文,李强,王汝恒.振动频率对饱和砂卵石土动模量和动阻尼比影响的试验研究[J].四川建筑科学研究,2007,33(6):113-115.Guo W,Li Q,Wang R H.Experimental study on influence of vibration frequency on dynamic modulus and damping ratio characteristics of saturated sandy pebble soil[J].Sichuan Building Science,2007,33(6):113-115.(in Chinese)
[13]杨贵,刘汉龙,高德清.加载频率对反滤料动变形特性影响的试验及细观数值模拟研究[J].岩土力学,2011,32(增1):419-423.Yang G,Liu H L,Gao D Q.Study of test and mesomechanical simulation of influence of vibration frequency on dynamic deformation property of inverted filler[J].Rock and Soil Mechanics,2011,32(Sup 1):419-423.(in Chinese)
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