砂土中单桩静载室内模型试验及颗粒流数值模拟

通过自行设计的可视化模型箱,进行了单桩静载室内模型试验,考虑了不同桩径、不同土体密实度等影响因素,研究了单桩的沉降模式、桩侧摩阻力和桩端阻力的发挥性状及随沉降的发展模式,并通过拍摄跟踪和图像处理技术,研究了桩端和桩周土体的孔隙率的变化规律;对二维颗粒流程序进行开发,模拟了单桩静载过程中桩端阻力和桩周土体孔隙率的变化情况。结果表明,颗粒流数值模拟能够较好地模拟单桩静载过程,研究成果进一步揭示了单桩静载过程的宏细观机制。

Model test of single pile static load in sands and numerical simulation using particle flow code

A model test of single pile static load has been carried out through visualization model box. Considering some influence factors, such as the different diameters of piles and different soil compactnesses, the settlement mode of single pile, the behaviour of skin friction resistance and pile-tip resistance with penetration are researched. Through screen and image-processing technology, the change rule of porosity in pile tip and pile-surrounding soil is researched too, through exploitation the process of planar particle flow code ,simulation the pile-tip resistance and the change rule of porosity in pile tip and pile-surrounding soil. The results show that the simulation using method of particle flow code can preferably simulate the process of static load of single pile and post the mechanisms of macro-scale and meso-scale of static load of single pile.