DEM study on effects of fabric and aspect ratio on small strain stiffness of granular soils

Gong Jian; Li Liang; Zhao Lianheng; Zou Jinfeng; Nie Zhihong

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DEM study on effects of fabric and aspect ratio on small strain stiffness of granular soils

机译：DEM研究织物和纵横比对粒状土壤小应变刚度的影响研究

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The effects of initial soil fabric and aspect ratio (AR) on the small-strain stiffness (G(0)) of granular soils are studied by employing discrete element method (DEM) numerical analysis. Elongated clumps composed of subspheres were adopted, and the G(0) values were obtained by DEM simulations of drained triaxial tests under different densities and initial confining pressure (p(0)). The DEM simulations indicate that the initial soil fabric has an insignificant effect on G(0). The effect of the AR on G(0) is related to the initial density. Namely, for dense specimens, G(0) first increases with increasing AR, reaching a plateau value when the AR = 1.5. However, for loose specimens, G(0) gradually increases as the AR increases. Microscopic examination reveals that G(0) uniquely depends on the coordination number of the particles (CN-particle) rather than the subspheres (CN-sphere) at the particulate level for the effects of initial soil fabric and AR. Finally, Poisson's ratio nu(0) is also determined by CN-particle. In addition, based on data in literature and this study, nu(0) can be fitted as nu(0) = 5.920(G(0)/(p(0))(1/3))(-)(0.)(99), which can be used to predict nu(0) of granular soils based on the measured G(0).

机译：通过采用分立元素法（DEM）数值分析，研究了初始土织物和纵横比（AR）对粒状土壤的小应变刚度（G（0））的影响。采用由亚球组成的细长丛，并通过在不同密度和初始限制压力下DEM仿真通过DEM仿真获得的G（0）值（P（0））。 DEM模拟表明初始土壤织物对G（0）具有微不足道的效果。 AR对G（0）的影响与初始密度有关。即，对于致密标本，G（0）首先随着AR增加而增加，当AR＆gt时达到平台值。= 1.5。然而，对于松散的标本，随着AR的增加，G（0）逐渐增加。显微镜检查显示，G（0）唯一地取决于颗粒（CN-颗粒）的配位数量（CN-颗粒）而不是颗粒水平的亚球（CN-球），用于初始土壤织物和AR的效果。最后，泊松的比率nu（0）也由CN粒子决定。此外，基于文献中的数据和本研究，Nu（0）可以拟合Nu（0）= 5.920（G（0）/（P（0））（1/3））（ - ）（0。）（99），其可用于预测基于测量的G（0）的粒状污染的Nu（0）。

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《Geomechanics and engineering》 |2021年第1期|57-65|共9页
作者
Gong Jian; Li Liang; Zhao Lianheng; Zou Jinfeng; Nie Zhihong;
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Guangxi Univ Coll Civil Engn & Architecture Nanning Guangxi Peoples R China|Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

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正文语种 eng
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关键词
inherent anisotropy; aspect ratio; small-strain stiffness; Poisson's ratio; granular soils; DEM;

机译：固有的各向异性;纵横比;小应变刚度;泊松比;颗粒状土壤;DEM;

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DEM study on effects of fabric and aspect ratio on small strain stiffness of granular soils

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