[最新文献]离散元模拟桩贯入以揭示土特性的影响
1 论文
Published Online: October 21, 2020
Discrete-element modelling of pile penetration to reveal influence of soil characteristics 离散元模拟桩贯入以揭示土特性的影响
Abstract: Soil response to pile penetration has both macro- and micro-mechanical aspects. At both scales, the properties of the particles and their interactions with each other control behaviour. Unfortunately, examination of particle-scale effects during penetration is not possible with either physical modelling or using continuum-based numerical models. The discrete-element method provides a powerful medium for modelling soils as particulate materials and can be used to investigate pile–soil interaction. However, such models are computationally demanding and need extensive optimisation, which in turn requires an understanding of the influences of soil characteristics on the mechanics. For this purpose, a series of pile penetration models were designed using three-dimensional discrete-element models. Structural parameters such as model dimensions and pile properties were kept constant while soil characteristics were varied one at time. This allowed uncoupled observation of the influences of individual soil characteristics including stiffness, inter-particle friction, rolling friction, average size, shape, packing density and grain size distribution. The results are presented in graphical form and their implications on modelling are discussed.
Keywords: discrete-element modelling piles & piling sands
摘要：土对桩贯入的响应具有宏观和微观力学两个方面。在这两个尺度上，颗粒的特性及其相互作用控制着行为。遗憾的是，在渗透过程中对颗粒尺度效应的研究不可能用物理模型或使用基于连续体的数值模型。离散元法为将土作为颗粒材料建模提供了一个强大的媒介，并可用于研究桩与土的相互作用。然而，这种模型对计算要求很高，需要进行广泛的优化，而这又需要了解土特性对力学的影响。为此，我们采用三维离散元模型设计了一系列桩贯入模型。结构参数如模型尺寸和桩的特性保持不变，而土特性则逐一变化。这样就可以无耦合地观察各个土特性的影响，包括刚度、颗粒间摩擦力、滚动摩擦力、平均尺寸、形状、填料密度和粒径分布。结果以图表形式呈现，并讨论了其对建模的影响。
关键字：离散元素模拟桩
2 相关文献
[1] Effects of curvature-related DEM contact model on the macro- and micro-mechanical behaviours of granular soils
[2] 3D assessment of fracture of sand particles using discrete element method
[3] A three-dimensional discrete element model using arrays of ellipsoids
[4] Discrete Element Modelling of Pile Penetration and Setup in Crushable Sands
[5] Discrete Element Modeling of Jacked Piles in Granular Soil
[6] Experimental characterizations and DEM simulations of pile installation and pile setup in sand
[7] DEM modelling of screw pile penetration in loose granular assemblies considering the effect of drilling velocity ratio
[8] DEM analysis of pile installation effect: comparing a bored and a driven pile
[9] Discrete element modelling of deep penetration in granular soils
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