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基于二维离散元软件PFC2D模拟工程实践中基桩自平衡测试法的加载过程,分析单桩在受荷条件下的模拟实验,揭示加载过程中单桩的承载特性以及桩土相互作用规律。研究结果表明:(1)在加载初始阶段,桩侧阻力要优于桩端阻力发挥,但是桩端阻力也有一定的发挥,随着加载的进行,桩端阻力开始占据一定的作用;(2)在加载过程中,桩周土体孔隙率呈有规律的变化,具体表现为桩端一定范围内的土体孔隙率变小,且越靠近桩端,孔隙率变化越大,沿竖直方向变大趋势减小,桩侧土体孔隙率的变化则主要是荷载箱附近和上段桩上部一定范围内变大;(3)在加载过程中,随着荷载的增大,桩周土体颗粒之间的配位数,土体水平向应力、竖直向应力以及桩周土颗粒的位移均呈有规律的变化。
Based on the two-dimensional discrete element software PFC2D simulating the loading process of pile self-balancing test, the simulation experiment of single pile under load is analyzed to reveal the bearing capacity of single pile and the law of pile-soil interaction during loading. The results show that: (1) At the initial stage of loading, the lateral resistance of the pile is better than that of the pile tip resistance, but the resistance of the pile tip is also exerted to some extent. With the loading, the resistance of the pile tip starts to play a certain role; (2) During the loading process, the porosity of the soil around the pile changes regularly, which shows that the porosity of the soil within a certain range of the pile tip becomes smaller, and the closer to the pile end, the greater the change of the porosity and the vertical change The trend of soil bulk density decreases, the change of the soil porosity on the pile side is mainly that the upper part of the pile near the load box becomes larger within a certain range; (3) During the loading process, as the load increases, The coordination between the number of soil horizontal stress, vertical stress and soil particles around the pile displacement showed a regular change.