固结时间对软粘土动剪切模量的影响
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摘要
随着固结时间的增加,试样逐渐变硬的硬化效应使软粘土的动剪切模量增大;同时,随着固结时间的增加,试样高度和直径明显减小的尺寸效应,也使软粘土的动剪切模量受到显著的影响。通过软粘土自振柱试验,分析了固结时间对软粘土的最大动剪切模量、动剪切模量比和试样尺寸的影响;根据自振柱试验的基本原理,分析了试样尺寸的变化对软粘土动剪切模量的影响;结合试验得到的固结时间和试样尺寸的关系,分析了固结时间通过试样尺寸对软粘土动剪切模量的影响。
The hardened effect that represents the soft clay harden gradually with the increment of consolidation time,makes dynamic shear modulus of soft clay increasing;meanwhile,the size effect that represents the height and diameter of the sample decreasing gradually,also produces effects on dynamic shear modulus of soft clay.A serial of free vibration column tests of soft clay is conducted to analyze the effects of consolidation time on maximal dynamic shear modulus, dynamic shear modulus ratio and sample's size of soft clay.According to the basic principle of the free vibration column test,the effects of varied sizes of sample on dynamic shear modulus of soft clay are analyzed.Combined with the relationships between consolidation time and sample′s size obtained from the tests,the size effects of consolidation time on maximum dynamic shear modulus of soft clay are analyzed.
The hardened effect that represents the soft clay harden gradually with the increment of consolidation time,makes dynamic shear modulus of soft clay increasing;meanwhile,the size effect that represents the height and diameter of the sample decreasing gradually,also produces effects on dynamic shear modulus of soft clay.A serial of free vibration column tests of soft clay is conducted to analyze the effects of consolidation time on maximal dynamic shear modulus, dynamic shear modulus ratio and sample's size of soft clay.According to the basic principle of the free vibration column test,the effects of varied sizes of sample on dynamic shear modulus of soft clay are analyzed.Combined with the relationships between consolidation time and sample′s size obtained from the tests,the size effects of consolidation time on maximum dynamic shear modulus of soft clay are analyzed.
引文
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[2]齐剑峰,栾茂田,杨庆,等.饱和粘土动剪切模量与阻尼比的试验研究[J].岩土工程学报,2008,30(4):518-523.Qi J F,Luan M T,Yang Q,et al.Dynamic shearmodulus and damping ratio of saturated clay[J].Chi-nese Journal of Geotechnical Engineering,2008,30(4):518-523.
[3]Afifi S E A.Effects of stress history on the shearmodulus of soils[D].Michigan:The University ofMichigan,Ann Arbor,1970.
[4]Drnevich V P.Effects of strain history on the dynam-ic properties of sand[D].Michigan:The Universityof Michigan,Ann Arbor,1967.
[5]Anderson D G,Stokoe K H.Shear modulus:a time-dependent soil Property[C]∥ASTM STP 654,Sym-posium on Dynamic Geotechnology Test.Denver,Colorado,USA:ASTM,1978.66-90.
[6]Brennan A J,Thusyanthan N I,Madabhushi S P.E-valuation of shear modulus and damping in dynamiccentrifuge tests[J].Journal of Geotechnical andGeoenvironmental Engineering,2005,131(12):1488-1497.
[7]Drnevich V P.Resonant-column testing:problemsand solutions[C]∥ASTM STP 654,Symposium onDynamic Geotechnology Test.Denver,Colorado,USA:ASTM,1978.384-398.
[8]Kim D S.Deformational characteristics of soils atsmall to intermediate strains from cyclic tests[D].Austin:The University of Texas,1991.
[9]Drnevich V P.Recent developments in resonant col-umn testing[C]∥Richart Commemorative Lectures.Proceedings of a session held in conjunction with theASCE Convention.Detroit,Michigan,USA:ASCE,1985.79-107.
[10]Meng J.The influence of loading frequency on dynam-ic soil properties[D].Atlanta:Georgia Institute ofTechnology,2003.
[11]孙静,袁晓铭,陶夏新.共振柱试验机试验误差分析[J].哈尔滨工业大学学报,2007,(4):510-513.Sun J,Yuan X M,Tao X X.Error analysis of reso-nant column device tests[J].Journal of Harbin Insti-tute of Technology,2007,(4):510-513.
[12]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 G X,Zhu D H,He Q Z.Development and prop-erty test of GZZ-1 free vibration column test system[J].Journal of Earthquake Engineering and Engi-neering Vibration,2003,23(1):110-114.
[13]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.Chen G X.Geotechnical Earthquake Engineering[M].Beijing:Science Press,2007.
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