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利用modelling of models的方法研究基础埋深对圆形浅基础承载力离心模型试验中的粒径效应的影响规律。使用的地基材料为经过粒度调整的河砂,其平均粒径为0.6 mm,模型基础直径为5～40 mm,模型基础直径与地基材料平均粒径的比值在8.3～66.7之间,模型基础埋深与直径的比值为0,0.5和1.0;模拟原型直径为200～1500 mm。利用粒径效应评价指标对试验中的粒径效应进行定量讨论,结果表明,随着基础埋深的增大,粒径效应的范围及对试验结果的影响程度减小。同时,给出粒径效应范围图,用于选择合理的模型基础尺寸或地基材料尺寸。
The effect of basic depth on the particle size effect in the centrifuge model test of circular shallow foundation is studied by means of modeling of models. The ground material used was graded river sand with an average particle size of 0.6 mm and a model foundation diameter of 5 to 40 mm. The ratio of the model foundation diameter to the average ground material size was between 8.3 and 66.7. The ratio of depth to diameter is 0, 0.5 and 1.0; the prototype diameter is 200 to 1500 mm. The particle size effect in the experiment was quantitatively discussed by using the particle size effect evaluation index. The results show that with the increase of the basic depth, the range of the particle size effect and the influence on the test result decrease. At the same time, given the particle size effect range map, used to select a reasonable model foundation size or foundation material size.