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通过对比不同长径比条件下单桩竖向承载力和桩端阻力粒径效应的不同,研究侧摩阻力对桩基承载力离心模型试验中粒径效应的影响。结果表明,由于侧摩阻力的作用机理与桩端阻力有较大的不同,在本试验范围内,不同桩径的模型桩模拟同一原型得到的侧摩阻力均有较大的不同,而桩端阻力除长径比为5时存在粒径效应现象,其他试验条件下模拟同一原型得到的试验结果基本相同。由于侧摩阻力的影响,单桩竖向承载力的粒径效应比桩端阻力的粒径效应显著。
The effect of side friction on the particle size effect in the centrifugal model test of pile bearing capacity was studied by comparing the vertical bearing capacity of single pile under different aspect ratios with the particle size effect of pile tip resistance. The results show that due to the large difference in the action mechanism of lateral friction and the resistance of pile tip, in the scope of this test, the pile friction with different pile diameters simulated by the same prototype is quite different, In addition to the resistance at a length-diameter ratio of 5, there is a phenomenon of particle size. Under the other experimental conditions, the test results obtained by simulating the same prototype are basically the same. Due to the influence of the side friction, the effect of the particle size of the vertical bearing capacity of the pile is more significant than that of the pile tip resistance.