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采用离心机模型试验与数值方法,对某一人工岛深厚软黏土地基的沉降特性进行了研究。在模拟现场施工条件下,通过离心机模型试验,研究了60 m厚软黏土地基的沉降特性。基于离心机模型试验,建立了二维有限元模型,应用弹黏塑性本构模型对软黏土地基的沉降规律进行了分析。通过模型试验与数值计算结果的对比分析,结果表明,模型试验与数值计算得到的工后沉降曲线基本吻合,初期沉降速率较大,后期沉降速率相对稳定。在浅部土层,计算得到的超孔压消散快于模型试验结果,而深部土层两者超孔压消散规律基本一致。二者规律的一致性验证了所用数值方法的可靠性。
Centrifuge model tests and numerical methods were used to study the settlement characteristics of an artificial island with deep thick soft clay. Under the condition of simulating on-site construction, the settlement characteristics of 60 m thick soft clay foundation were studied by centrifuge model test. Based on the centrifuge model test, a two-dimensional finite element model was established, and the settlement law of soft clay foundation was analyzed by using elastic viscoplastic constitutive model. The results of model tests and numerical calculations show that the settlement curves obtained by the model tests and the numerical calculations are in good agreement with the initial settlement rates and the settlement rates at the later stage are relatively stable. In the shallow soil, the calculated excess pore pressure dissipates faster than the model test results, while the excess pore pressure dissipation law in the deep soil layer is basically the same. The consistency of the two laws verifies the reliability of the numerical method used.