砂土中刚性短桩水平极限承载力的离散元模拟分析

DISCRETE ELEMENT SIMULATION ANALYSIS OF HORIZONTAL ULTIMATE BEARING CAPACITY OF RIGID SHORT PILE IN SAND

在砂土中桩水平极限承载力的离散元数值模型中,桩体作为刚体,在桩端自由和桩端固定的边界条件,桩体受水平力,分别产生旋转运动、水平运动。根据不同深度桩侧土阻力、相应桩体的位移,得到p–y曲线。此外,可以详细观察桩土相互作用,以揭示桩体运动所造成的影响。最后,比较分析离散元模型分析水平极限承载力结果与其他现有半经验法的计算结果。

A DEM numerical model is constructed for analysis of ultimate lateral resistance to piles in sands.The pile was modeled as a rigid body with two kinds of pile movements: rotational and translational movement,simulating free head and fixed head condition, respectively. In the numerical experiments, the lateral resistance,lateral pressure distribution along the pile and the displacement of pile at different depths can be measured and used to construct the p–y curve. In addition, the soil-pile interaction can be examined in detail to reveal the extent of influence due to the movement of the pile. In general, the results of the numerical simulation were compared favorably with other semi-empirical solutions.