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为了研究双土层情况下土层相对位置不同时桶形基础地基土在单一荷载作用下的极限承载力,采用南水土体本构模型进行ABAQUS有限元建模。在分析过程中,首先采用位移控制法,通过计算地基的p-s曲线确定相应的地基极限承载力,然后以单一加载情况下的地基极限承载力为基准进行归一化,最后提出土层相对位置修正系数的概念,从而获得土层相对位置不同时的地基极限承载力表达式。分析结果表明:土层由单一黏土层向单一淤泥层变化的过程中,竖向承载力、水平承载力和力矩承载力都逐渐减小,且减小幅度最大的是竖向承载力,其次是水平承载力,最后是力矩承载力;当土层相对位置比分别达到0.33,0.25和0.2时,竖向承载力、水平承载力、力矩承载力依次趋于稳定。
In order to study the ultimate bearing capacity of bucket foundation soil under single load with different relative positions of soil layers in the case of double soil layers, the ABAQUS finite element model was established using the constitutive model of soil and water bodies in the south. In the process of analysis, firstly, the displacement control method is adopted to determine the corresponding ultimate bearing capacity of foundation by calculating the ps curve of the foundation. Then, the ultimate bearing capacity of the foundation is normalized based on the single loading. Finally, the relative position correction The concept of the coefficient, so as to obtain the expression of the ultimate bearing capacity of the foundation when the relative position of the soil is different. The results show that the vertical bearing capacity, the horizontal bearing capacity and the moment bearing capacity decrease gradually when the soil layer changes from a single clay layer to a single silt layer, and the vertical bearing capacity is the greatest decreasing extent, followed by Horizontal bearing capacity and finally moment bearing capacity. When the relative position ratios of soil layers reach 0.33, 0.25 and 0.2, respectively, the vertical bearing capacity, horizontal bearing capacity and moment load capacity tend to be stable in turn.