基于抗拔桩承载力试验的隧道底板-桩-土共同作用数值分析

摘要

Taking the anti-floating design of the open section of Baishi tunnel in Guangzhou-Foshan-Zhaoqing expressway as the background,the bearing capacity of single piles of uplift piles is studied by the test of bearing capacity of uplift piles.This paper established the pile-soil numerical model and the calculated results are compared with the experimental results,comparison shows:The numerical model set up for numerical calculation and the relevant physical and mechanical parameters selected are reasonable and reliable.In addition,the numerical analysis model of tunnel floor-pile-soil is established to simulate the internal force and deformation characteristics of tunnel floor and uplift piles under joint functioning of the 3 factors,so to provide reference and theoretical basis for similar project design.%以广佛肇高速公路白石隧道敞开段抗浮设计为背景,通过抗拔桩承载力试验,研究抗拔桩单桩承载特性.建立桩-土数值计算模型,并将计算结果与试验结果进行对比,结果表明:数值计算时所建立的数值模型与选取的相关物理力学参数是合理可靠的.另外,建立隧道底板-桩-土数值分析模型,模拟三者共同作用下隧道底板、抗拔桩的内力与变形特征,以期为同类工程设计提供参考和理论依据.