直剪试验颗粒流模拟参数敏感性分析
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摘要
利用离散元颗粒流程序PFC2D对砂土的直剪试验进行了模拟,试验中通过改变颗粒的孔隙比、接触刚度和粒间摩擦系数等微观参数的取值,来探究宏观参数如初始弹性模量和内摩擦角的变化。得到颗粒的平均配位数随孔隙比的变化曲线、不同围压下颗粒的法向重叠量随颗粒刚度的变化曲线和材料内摩擦角和颗粒摩擦系数间的关系曲线,有益于理解土体的本构模型。
The direct shear tests of sandy soil are simulated by particle flow code in two dimension(PFC2D).In the tests the void ratio particle stiffness and particle frictional coefficient are changed to different values to investigate the variations of macro-parameters such as Young's modulus and internal friction angle.The curve of average coordination number with void ratio,the curve of particle overlap with normal stiffness and the curve of relationship between internal friction angle and particle frictional coefficient are described,which are beneficial to develop the soil constitutive models.
The direct shear tests of sandy soil are simulated by particle flow code in two dimension(PFC2D).In the tests the void ratio particle stiffness and particle frictional coefficient are changed to different values to investigate the variations of macro-parameters such as Young's modulus and internal friction angle.The curve of average coordination number with void ratio,the curve of particle overlap with normal stiffness and the curve of relationship between internal friction angle and particle frictional coefficient are described,which are beneficial to develop the soil constitutive models.
引文
[1]Cundall P A,Strack O D L.Particleflow code in 2 Dimensions[C]∥Itasca Consulting Group,Inc,1999.
[2]Cundall P A,Strack O D L.A discrete numerical model for gran-ular assembles[J].Geotechnique,1979,29(1):47-65.
[3]周健,池永,池毓蔚,徐建平.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[4]周健,池永.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.
[5]周健,廖雄华,池永,徐建平.土的室内平面应变试验的颗粒流模拟[J].同济大学学报,2002,30(9):1044-1050.
[6]周健,池毓蔚,池永,徐建平.砂土双轴试验的颗粒流模拟[J].岩土工程学报,2000,22(6):701-7041.
[7]曾远,周健.砂土的细观参数对宏观特性的影响研究[J].地下空间与工程学报,2008,3(4):499-503.
[8]申志福,蒋明镜,朱方园,胡海军.离散元微观参数对砂土宏观参数的影响[J].西北地震学报,2011,33(supp):160-165.
[9]徐小敏,凌道盛,陈云敏,黄博.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究[J].岩土工程学报,2010,32(7):499-503.
[10]Oda M.The mechanics of fabric changes during compressional de-formation of sand[J].Soil and foundation.1972,12(2):1-17.
[11]Skinner A E,Mice B Sc.A note on the influence of inter particlefriction on the shearing strength of a random assembly of sphericalparticle[J].Geotechnique,1969,19(1):150-157.
[2]Cundall P A,Strack O D L.A discrete numerical model for gran-ular assembles[J].Geotechnique,1979,29(1):47-65.
[3]周健,池永,池毓蔚,徐建平.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[4]周健,池永.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.
[5]周健,廖雄华,池永,徐建平.土的室内平面应变试验的颗粒流模拟[J].同济大学学报,2002,30(9):1044-1050.
[6]周健,池毓蔚,池永,徐建平.砂土双轴试验的颗粒流模拟[J].岩土工程学报,2000,22(6):701-7041.
[7]曾远,周健.砂土的细观参数对宏观特性的影响研究[J].地下空间与工程学报,2008,3(4):499-503.
[8]申志福,蒋明镜,朱方园,胡海军.离散元微观参数对砂土宏观参数的影响[J].西北地震学报,2011,33(supp):160-165.
[9]徐小敏,凌道盛,陈云敏,黄博.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究[J].岩土工程学报,2010,32(7):499-503.
[10]Oda M.The mechanics of fabric changes during compressional de-formation of sand[J].Soil and foundation.1972,12(2):1-17.
[11]Skinner A E,Mice B Sc.A note on the influence of inter particlefriction on the shearing strength of a random assembly of sphericalparticle[J].Geotechnique,1969,19(1):150-157.
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