非饱和黄土动剪切模量和阻尼比共振柱试验研究
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摘要
土的动剪切模量G和阻尼比D是描述土体动力特性的两个主要参数。利用GDS共振柱试验系统对不同细粒含量的非饱和黄土开展了动力学参数试验研究。结果表明,用Hardin-Drnevich双曲线模型能够较好地拟合G、G/Gmax随剪应变γ的变化趋势;在其它条件相同时,G随细粒含量的增加而减小,阻尼比D与细粒含量的变化关系表现为细粒含量越多,阻尼比越小,阻尼比与剪应变的关系可表示成G/Gmax的函数,用含G/Gmax的二次多项式能较好地描述D与G/Gmax之间的关系。
Dynamic shear modulus G and damping ratio D are the two main parameters for describing the dynamic characteristics of soil.Some dynamic parameters tests on the unsaturated loess with different fine contents were performed by using GDS resonant column system.The test results show that the relation of G,G/Gmaxand the dynamic shear strain γ can be well fitted by Hardin-Drnevich hyperbolic model; the dynamic shear modulus decreases with the increase of fine particle content when other conditions remain constant.The damping ratio D decreases with the increment of fine content,and the relation between D and γcan be represented by a function of G/Gmax,while the relation of D and G/Gmaxcan also be expressed by a quadratic polynomial of G/Gmax.
Dynamic shear modulus G and damping ratio D are the two main parameters for describing the dynamic characteristics of soil.Some dynamic parameters tests on the unsaturated loess with different fine contents were performed by using GDS resonant column system.The test results show that the relation of G,G/Gmaxand the dynamic shear strain γ can be well fitted by Hardin-Drnevich hyperbolic model; the dynamic shear modulus decreases with the increase of fine particle content when other conditions remain constant.The damping ratio D decreases with the increment of fine content,and the relation between D and γcan be represented by a function of G/Gmax,while the relation of D and G/Gmaxcan also be expressed by a quadratic polynomial of G/Gmax.
引文
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[6]田堪良,张慧莉,张伯平.动扭剪荷载作用下非饱和黄土动力特性试验研究[J].岩石力学与工程学报,2004,23(24):4151-4155.
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[8]王志杰,骆亚生,王瑞瑞,等.不同地区原状黄土动剪切模量与阻尼比试验研究[J].岩土工程学报,2011,28(9):1464-1469.
[9]Hardin BO,Drnevich VP.Shear modulus and damping in soils:measurement and parameter effects(terzaghi leture)[J].Journal of the soil mechanics and foundations division,1972,98(6):603-624.
[10]吕小飞,陈培雄,杨义菊.海洋粉质粘土共振柱试验研究[J].世界地震工程,2010,(26):1-5.
[11]陈国兴,刘雪珠,朱定华.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,(8):1023-1027.
[2]李又云,谢永利,刘保健.路基压实黄土动力特性的试验研究[J].岩石力学与工程学报,2009,28(5):1037-1046.
[3]骆亚生,李瑞,田堪良.非饱和黄土动力特性试验方法研究[J].地下空间与工程学报,2007,(6):1041-1046.
[4]王志杰,骆亚生,谭东岳,等.干密度对预剪应力下重塑黄土动力特性影响的试验研究[J].西北地震学报,2011,(4):349-353.
[5]陈存礼,杨鹏,何军芳.饱和击实黄土的动力特性研究[J].岩土力学,2007,28(8):1551-1556.
[6]田堪良,张慧莉,张伯平.动扭剪荷载作用下非饱和黄土动力特性试验研究[J].岩石力学与工程学报,2004,23(24):4151-4155.
[7]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830-834.
[8]王志杰,骆亚生,王瑞瑞,等.不同地区原状黄土动剪切模量与阻尼比试验研究[J].岩土工程学报,2011,28(9):1464-1469.
[9]Hardin BO,Drnevich VP.Shear modulus and damping in soils:measurement and parameter effects(terzaghi leture)[J].Journal of the soil mechanics and foundations division,1972,98(6):603-624.
[10]吕小飞,陈培雄,杨义菊.海洋粉质粘土共振柱试验研究[J].世界地震工程,2010,(26):1-5.
[11]陈国兴,刘雪珠,朱定华.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,(8):1023-1027.
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