饱和砂土动力特性的动三轴试验研究
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摘要
利用GDS 10 Hz/20 kN双向振动三轴系统,进行了一系列饱和砂土不排水动三轴试验,研究了不同固结围压对饱和砂土动力特性的影响。试验结果表明:动弹性模量随动弹性应变幅的增大而减小,随围压的增大而增大;阻尼比随动弹性应变幅的增大而增大,围压对阻尼比的影响不显著,动弹性应变比较低的情况下,阻尼比有随围压增大而减小的趋势;不同围压下砂土的动强度曲线可近似地归一,其振动孔压发展模式与Seed提出的砂土的振动孔压发展模式相同,可以用反正弦三角函数拟合。
With the GDS 10Hz/20kN dynamic triaxial system,the undrained dynamic triaxial tests on the saturated sands are performed.The confining pressure effects on dynamic characteristics of the saturated sand are discussed.It is found that the dynamic elastic modulus decreases with the dynamic elastic strain increasing,but increases with the accretion of confining pressure.The damping ratio is not sensitive to the change of confining pressure,but it has the tendency to decrease as the accretion of confining pressure,especially in minor dynamic elastic strain.The dynamic strength curve under different confining pressures can be described by the same expression approximately under isotropic consolidation,the pore water pressure curve in mealy sand is the same as that proposed by Seed and can be fitted by arcsine function under different confining pressures.
With the GDS 10Hz/20kN dynamic triaxial system,the undrained dynamic triaxial tests on the saturated sands are performed.The confining pressure effects on dynamic characteristics of the saturated sand are discussed.It is found that the dynamic elastic modulus decreases with the dynamic elastic strain increasing,but increases with the accretion of confining pressure.The damping ratio is not sensitive to the change of confining pressure,but it has the tendency to decrease as the accretion of confining pressure,especially in minor dynamic elastic strain.The dynamic strength curve under different confining pressures can be described by the same expression approximately under isotropic consolidation,the pore water pressure curve in mealy sand is the same as that proposed by Seed and can be fitted by arcsine function under different confining pressures.
引文
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[13]陈伟,孔令伟,朱建群.一种土的阻尼比近似计算方法[J].岩土力学,2007,28(增):789-791.(Chen Wei,Kong Lingwei,Zhu Jianqun.A simplemethod to approximately determine the damping ratioof soils[J].Rock and Soil Mechanics,2007,28(Supp.):789-791.(in Chinese))
[14]王艳丽,王勇.饱和砂的动孔压演化特性试验研究[J].同济大学学报(自然科学版),2009,37(12):1 603-1 607.(Wang Yanli,Wang Yong.Experimen-tal study on evolutionary characteristic of dynamicpore water pressure of saturated sands[J].Journal ofTongji University(Natural Science),2009,37(12):1 603-1 607.(in Chinese)
[2]刘惠珊,张在明.地震区的场地与地基基础[M].北京:中国建筑工业出版社,1994.(Liu Huishan,Zhang Zaiming.Field and foundation of earthquake area[M].Beijing:China Architecture&Building Press,1994.(in Chinese))
[3]Martin G R,Finn W D L,Seed H B.Fundamentals ofliquefaction under cyclic loading[J].Journal of theGeotechnical Engineering Division,American Society ofCivil Engineering,1975,101(S):423-438.
[4]祝龙根,吴晓峰.低幅剪应变条件下砂土的动力特性的研究[J].水电自动化与大坝监测,1988,12(1):27-33.(Zhu Longgen,Wu Xiaofeng.A study ofdynamic properties of sand under the low amplitudestrain[J].Hydropower Automation and DamMonitoring,1988,12(1):27-33.(in Chinese))
[5]李刚,陈正汉,王权民.厦门市海积粉细砂的动力特性试验研究[J].四川建筑科学研究,2002,28(2):33-36.(Li Gang,Chen Zhenghan,WangQuanmin.The experimental study of dynamiccharacteristic of fine silt in Xiamen[J].SichuanBuilding Science,2002,28(2):33-36.(in Chinese))
[6]孙吉主,黄明利,汪稔.内孔隙与各向异性对钙质砂液化特性的影响[J].岩土力学,2002,23(2):166-169.(Sun Jizhu,Huang Mingli,Wang Ren.Influence of inner pore and anisotropy on liquefactioncharacteristics of calcareous sand[J].Rock and SoilMechanics,2002,23(2):166-169.(in Chinese))
[7]Zhang J F,Andrus R D,Juang C H.Normalized shearmodulus and material damping ratio relationships[J].Journal of Geotechnical and GeoenvironmentalEngineering,ASCE.2005,131(4):453-464.
[8]靳建军,张鸿儒.砂土液化特性MTS动三轴试验研究[J].北京交通大学学报,2006,30(4):60-63.(Jin Jianjun,Zhang Hongru.Study on sand liquefactioncharacteristics by MTS dynamic tri-axial test[J].Journal of Beijing Jiaotong University,2006,30(4):60-63.(in Chinese))
[9]GBSL237—1999,土工试验规程[S].(GBSL 237—1999,Geotechnical Testing Regulation Specification ofSoil Test[S].(in Chinese))
[10]Flores O C,Romo M P O.Dynamic behavior oftailings[A].In:Proc.of Fourth internationalConference on Recent Advances in GeotechnicalEarthquake Engineering and soil Dynamic andSymposium in Honor of Professor Liam W.D.Finn[C].San Diego,California:[s.n.].2001,1-6.
[11]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):1 403-1 410.(ChenGuoxing,Liu Xuezhu.Testing study on ratio ofdynamic shear moduli and ratio of damping forrecently deposited soils in Nanjing and its neighboringareas[J].Chinese Journal of Rock Mechanics andEngineering,2004,23(8):1 403-1 410.(inChinese))
[12]谢定义.土动力学[M].西安:西安交通大学出版社,1988.(Xie Dingyi,Soil dynamics[M].Xi’an:Xi’an Jiaotong University Press,1988.(inChinese))
[13]陈伟,孔令伟,朱建群.一种土的阻尼比近似计算方法[J].岩土力学,2007,28(增):789-791.(Chen Wei,Kong Lingwei,Zhu Jianqun.A simplemethod to approximately determine the damping ratioof soils[J].Rock and Soil Mechanics,2007,28(Supp.):789-791.(in Chinese))
[14]王艳丽,王勇.饱和砂的动孔压演化特性试验研究[J].同济大学学报(自然科学版),2009,37(12):1 603-1 607.(Wang Yanli,Wang Yong.Experimen-tal study on evolutionary characteristic of dynamicpore water pressure of saturated sands[J].Journal ofTongji University(Natural Science),2009,37(12):1 603-1 607.(in Chinese)
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