人工岛沉降的离心机模型试验与数值分析

发布时间：2018-04-03 12:32

本文选题：人工岛　切入点：离心机试验　出处：《岩土力学》2015年08期

【摘要】：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。
[Abstract]:The settlement characteristics of a deep soft clay foundation on an artificial island were studied by centrifuge model test and numerical method.In this paper, the settlement characteristics of 60 m thick soft clay foundation are studied by centrifuge model test under the condition of simulating site construction.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 the elasto-viscoplastic constitutive model.By comparing the results of model test and numerical calculation, the results show that the settlement curves obtained by model test and numerical calculation are in good agreement with each other, the initial settlement rate is large, and the late settlement rate is relatively stable.In the shallow soil layer, the superpore pressure dissipates faster than the model test results, while the superpore pressure dissipation law in the deep soil layer is basically the same as that in the deep soil layer.The consistency of the two laws verifies the reliability of the numerical method.
【作者单位】：大连理工大学建设工程学部土木工程学院岩土工程研究所;大连理工大学海岸和近海工程国家重点实验室;同济大学地下建筑与工程系;南京水利科学研究院岩土工程研究所;
【基金】：国家自然科学基金资助项目(No.51179023)
【分类号】：TU411

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