被动侧向受荷桩模型试验及颗粒流数值模拟研究

Model tests and PFC^(2D) numerical analysis on laterally loaded passive piles

本文采用室内模型试验与颗粒流数值模拟相结合的方法对砂土中被动侧向受荷短桩桩土相互作用性状进行了较系统和深入的研究。在室内模型试验中,研究了短桩在松砂、中密砂、密砂中的挡墙荷载–位移关系,桩顶位移对挡墙位移的响应规律,及桩前、桩后土压力的分布和发展规律。通过开发颗粒流程序模拟室内模型试验在加载条件下桩土相互作用过程中的应力和位移的变化规律,与模型试验的结果进行了对比分析。本文的研究对揭示被动桩与周围土体的作用规律及更深入的了解桩土相互作用机理有参考价值。

Experimental and numerical studies on pile-soil interaction mechanism of passive laterally loaded free-head short piles in sand were presented. Physical model tests were performed using loose, medium and dense sand to investigate the relationship between retaining wall loading and displacement, the response low of displacement of pile top to the displacement of retaining wall as well as the load transfer mechanism for piles and soil. A two-dimensional discrete element method （Particle Flow Code in Two Dimensions） was used to carry out the simulation of the relationship between the stress and the displacement of soil and piles owing to the pile-soil interaction behavior during the loading procedure. Experimental results were compared with those from numerical analysis. The study would be helpful to deeply reveal the pile-soil interaction law and raise the design level of passive laterally loaded piles.