南京细砂动剪切模量和阻尼比的试验研究
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摘要
动剪切模量和阻尼比是重大工程开展场地地震反应分析必不可少的参数。完成了南京细砂的自振柱和动三轴试验,研究了固结围压、孔隙比、含水量和荷载频率对动剪切模量和阻尼比的影响。试验结果表明:固结围压和孔隙比对最大动剪切模量的影响显著,建立了最大剪切模量与固结围压、孔隙比之间的经验关系,最大剪切模量随细砂中含水量的增加而减小并趋于稳定;固结围压对动剪切模量比具有一定影响,其他3个因素对动剪切模量比和阻尼比的影响不明显;排水条件下泊松比随剪应变幅值的增大而增大,剪应变幅值在1.0×10-4~1.0×10-3范围时,泊松比增大的趋势更加明显;采用自振柱和动三轴试验测试得到的动剪切模量比和阻尼比基本一致。
Dynamic shear modulus and damping of a site are the basic data for seismic response analysis of important project.The free-vibration column tests and dynamic triaxial tests were carried out for studying the effects of consolidation pressure,void ratio,moisture content and loading frequency on the dynamic shear modulus and damping of Nanjing fine sand with flaky particles.Based on the results of tests,the major conclusions are as follows: the maximum dynamic shear modulus is obviously affected by the consolidation pressure and void ratio,and a relationship among them is developed,and it decreases and tends to stable with the increase of the moisture content of sand.The dynamic shear modulus ratio has some effect on the consolidation pressure,and the effect of other three factors is neglected.The Poisson ratio increases with the increase of the shear strain amplitude,and it increases more obviously in the range of shear strain 1.0×10-4~1.0×10-3.The free-vibration column test and dynamic triaxial test yield basically the consistent results of dynamic shear modulus ratio and damping ratio.
Dynamic shear modulus and damping of a site are the basic data for seismic response analysis of important project.The free-vibration column tests and dynamic triaxial tests were carried out for studying the effects of consolidation pressure,void ratio,moisture content and loading frequency on the dynamic shear modulus and damping of Nanjing fine sand with flaky particles.Based on the results of tests,the major conclusions are as follows: the maximum dynamic shear modulus is obviously affected by the consolidation pressure and void ratio,and a relationship among them is developed,and it decreases and tends to stable with the increase of the moisture content of sand.The dynamic shear modulus ratio has some effect on the consolidation pressure,and the effect of other three factors is neglected.The Poisson ratio increases with the increase of the shear strain amplitude,and it increases more obviously in the range of shear strain 1.0×10-4~1.0×10-3.The free-vibration column test and dynamic triaxial test yield basically the consistent results of dynamic shear modulus ratio and damping ratio.
引文
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[2]Hardin B O,Drnevich VP.Shear modulus and damping in soil:measurement and parameter effects[J].Journal of the Soil mechanics and Foun-dation Engineering Division,ASCE.1972,98(6):603-624.
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[17]Wichtmann T,Triantafyllidis T.Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,part I:cyclic and dynamictorsional prestraining[J].Soil Dynamics and Earthquake Engineering,2004,24(2):127-147.
[18]Wichtmann T,Triantafyllidis T.Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,part II:cyclic axial preload-ing[J].Soil Dynamics and Earthquake Engineering,2004,24(11):789-803.
[19]Zhou Y,Chen Y.Influence of seismic cyclic loading history on small strain shear modulus of saturated sands[J].Soil Dynamics and EarthquakeEngineering,2005,25(5):341-353.
[20]Troncoso J H,Garc,S E.Ageing effects in the shear modulus of soils[J].Soil Dynamics and Earthquake Engineering,2000,19(8):595-601.
[21]Anderson D G,Stokoe K H.Shear Modulus:A Time-Dependent Soil Property[C].Denver,Colorado,USA:1978.
[22]周镜,杨灿文.片状砂的工程特性及其应用[C].海峡两岸土力学及基础工程地工技术学术研讨会,1994:172-179.Zhou Jing,Yang Canwen.Engineering properties and application of the flaky sand[C].Seminar of Soil Mechanics and Foundation Engineering inEngineering Technology Between the Taiwan Strait,ASTMGeotechnical Testing Journal.1994:172-179.
[23]陈国兴,刘雪珠,朱定华,等.南京新近沉积土动剪切模量比与阻尼比的试验研究[J].岩土工程学报,2006,28(8):1023-1027.Chen Guoxing,Liu Xuezhu,Zhu Dinghua,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently depositedsoils in Nanjing[J].Chinese Journal of Geotechnical Engineering,2006,28(8):1023-1027.
[24]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].岩石力学与工程学报,2004,23(8):1403-1410.Chen Guoxing,Liu Xuezhu.Testing study on ratio of dynamic shear moduli and ratio of damping for recently deposited soils in nanjing and itsneighboring areas[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):1403-1410.
[25]刘雪珠,陈国兴,胡庆兴.南京地区新近沉积土的动剪切模量和阻尼比的初步研究[J].地震工程与工程振动,2002,22(5):127-131.Liu Xuezhu,Chen Guoxing,Hu Qingxing.Primary study on dynamic shear modulus and damping ratio of recently deposited soil in area of Nan-jing[J].Journal of Earthquake Engineering and Engineering Vibration,2002,22(5):127-131.
[26]陈国兴,朱定华,何启智.GZZ-1型自振柱试验机研制与性能试验[J].地震工程与工程振动,2003,23(1):110-114.Chen Guoxing,Zhu Dinghua,He Qizhi.Development and property test of GZZ-1 free vibration column test system[J].Journal of EarthquakeEngineering and Engineering Vibration,2003,23(1):110-114.
[27]陈国兴,朱定华,何启智.DSZ-1型动三轴试验机研制与性能试验[J].地震工程与工程振动,2002,22(6):71-74.Chen Guoxing,Zhu Dinghua,He Qizhi.Development and test of DSZ-1 cyclic triaxial testing system[J].Journal of Earthquake Engineeringand Engineering Vibration,2002,22(6):71-74.
[28]Kim D S,Stokoe K HI.Torsional motion monitoring system for small-strain(10-5 to 10-3%)soil testing[J].ASTM Geotechnical TestingJournal,1994,17(1):17-25.
[29]Seed HB,Idriss I M.Soil moduli and damping factors for dynamic response analyses[R].Berkeley:Earthquake Engineering Research Center,University of California,1970.
[30]孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004.Su Jing.Experiment and application studies on dynamic shear modulus and damping of geotechnical media[D].Harbin:Institute of EngineeringMechanics,China Earthquake Administration,2004.
[2]Hardin B O,Drnevich VP.Shear modulus and damping in soil:measurement and parameter effects[J].Journal of the Soil mechanics and Foun-dation Engineering Division,ASCE.1972,98(6):603-624.
[3]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of the Soil mechanics and FoundationEngineering Division,ASCE.1972,98(7):667-692.
[4]Wang Y H.Attenuation in soils and non-linear dynamic effects[D].Georgia Institute of Technology,2001.
[5]Kokusho T.Cyclic triaxial test of dynamic soil properties for wide strain range[J].Soils and Foundations,1980,20(2):45-60.
[6]Saxena S K,Reddy K R.Dynamic moduli and damping ratios for Monterey no.0 sand by resonant column tests[J].Soils and Foundations,1989,29(2):37-51.
[7]蔡正银,李相崧.材料状态对干砂小应变特性的影响[J].岩土力学,2004,25(1):10-14.Cai Zhengyin,Li Xiangsong.Effects of material state on the small strain behavior of dry sand[J].Rock and Soil Mechanics,2004,25(1):10-14.
[8]李万红,汪闻韶.超声波测三轴饱和砂样剪切模量及力学性的关系[J].水利学报,1988(3):19-27.Li Wanhong,Wang Wenshao.Measurement of shear modulus for saturated sand by ultrasonic method[J].Journal of Hydraulic Engineering,1988(3):19-27.
[9]袁晓铭,孙静.非等向固结下砂土最大动剪切模量增长模式及Hardin公式修正[J].岩土工程学报,2005,27(3):264-269.Yuan Xiaoming,Sun Jing.Model of maximum dynamic shear modulus of sand under anisotropic consolidation and revision of Hardin’s formula[J].Chinese Journal of Geotechnical Engineering,2005,27(3):264-269.
[10]Yamada S,Hyodo M,Orense R P,et al.Initial shear modulus of remolded sand-clay mixtures[J].Journal of Geotechnical and Geoenviron-mental Engineering,2008,134(7):960-971.
[11]Ishihara K.Soil Behavior in Earthquake Geotechnics[M].Oxford:Clarendon Press,1996.
[12]Qian X,Gray D H,Woods R D.Voids and granulometry:effects on shear modulus of unsaturated sands[J].Journal of Geotechnical Engineer-ing,1993,119(2):295-314.
[13]Kim D,Seo W,Kim M.Deformation characteristics of soils with variations of capillary pressure and water content[J].Soils and Foundations.2003,43(4):71-79.
[14]Wu S,Gray D H,Richart J F E.Capillary effects on dynamic modulus of sands and silts[J].Journal of Geotechnical EngineeringJ.Geotech.Engrg,1984,110(9):1188-1203.
[15]Meng Jiewu.The influence of loading frequency on dynamic soil properties[D].Atlanta Georgia:Georgia Institute of Technology,2003.
[16]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):443-448.Sun Jing,Yuan Xiaoming.Effects of consolidation ratios of sands on dynamic shear modulus and response spectrum of soil surface[J].Rock andSoil Mechanics,2007,28(3):443-448.
[17]Wichtmann T,Triantafyllidis T.Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,part I:cyclic and dynamictorsional prestraining[J].Soil Dynamics and Earthquake Engineering,2004,24(2):127-147.
[18]Wichtmann T,Triantafyllidis T.Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,part II:cyclic axial preload-ing[J].Soil Dynamics and Earthquake Engineering,2004,24(11):789-803.
[19]Zhou Y,Chen Y.Influence of seismic cyclic loading history on small strain shear modulus of saturated sands[J].Soil Dynamics and EarthquakeEngineering,2005,25(5):341-353.
[20]Troncoso J H,Garc,S E.Ageing effects in the shear modulus of soils[J].Soil Dynamics and Earthquake Engineering,2000,19(8):595-601.
[21]Anderson D G,Stokoe K H.Shear Modulus:A Time-Dependent Soil Property[C].Denver,Colorado,USA:1978.
[22]周镜,杨灿文.片状砂的工程特性及其应用[C].海峡两岸土力学及基础工程地工技术学术研讨会,1994:172-179.Zhou Jing,Yang Canwen.Engineering properties and application of the flaky sand[C].Seminar of Soil Mechanics and Foundation Engineering inEngineering Technology Between the Taiwan Strait,ASTMGeotechnical Testing Journal.1994:172-179.
[23]陈国兴,刘雪珠,朱定华,等.南京新近沉积土动剪切模量比与阻尼比的试验研究[J].岩土工程学报,2006,28(8):1023-1027.Chen Guoxing,Liu Xuezhu,Zhu Dinghua,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently depositedsoils in Nanjing[J].Chinese Journal of Geotechnical Engineering,2006,28(8):1023-1027.
[24]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].岩石力学与工程学报,2004,23(8):1403-1410.Chen Guoxing,Liu Xuezhu.Testing study on ratio of dynamic shear moduli and ratio of damping for recently deposited soils in nanjing and itsneighboring areas[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):1403-1410.
[25]刘雪珠,陈国兴,胡庆兴.南京地区新近沉积土的动剪切模量和阻尼比的初步研究[J].地震工程与工程振动,2002,22(5):127-131.Liu Xuezhu,Chen Guoxing,Hu Qingxing.Primary study on dynamic shear modulus and damping ratio of recently deposited soil in area of Nan-jing[J].Journal of Earthquake Engineering and Engineering Vibration,2002,22(5):127-131.
[26]陈国兴,朱定华,何启智.GZZ-1型自振柱试验机研制与性能试验[J].地震工程与工程振动,2003,23(1):110-114.Chen Guoxing,Zhu Dinghua,He Qizhi.Development and property test of GZZ-1 free vibration column test system[J].Journal of EarthquakeEngineering and Engineering Vibration,2003,23(1):110-114.
[27]陈国兴,朱定华,何启智.DSZ-1型动三轴试验机研制与性能试验[J].地震工程与工程振动,2002,22(6):71-74.Chen Guoxing,Zhu Dinghua,He Qizhi.Development and test of DSZ-1 cyclic triaxial testing system[J].Journal of Earthquake Engineeringand Engineering Vibration,2002,22(6):71-74.
[28]Kim D S,Stokoe K HI.Torsional motion monitoring system for small-strain(10-5 to 10-3%)soil testing[J].ASTM Geotechnical TestingJournal,1994,17(1):17-25.
[29]Seed HB,Idriss I M.Soil moduli and damping factors for dynamic response analyses[R].Berkeley:Earthquake Engineering Research Center,University of California,1970.
[30]孙静.岩土动剪切模量阻尼试验及应用研究[D].哈尔滨:中国地震局工程力学研究所,2004.Su Jing.Experiment and application studies on dynamic shear modulus and damping of geotechnical media[D].Harbin:Institute of EngineeringMechanics,China Earthquake Administration,2004.
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