软黏土上覆硬土层极限承载力室内模型试验研究

On indoor model test about the ultimate bearing capacity of soft soil covered by hard solum

对双层地基室内模型试验分析,研究了软黏土上覆硬土层厚度变化和水灰比变化对上覆硬土层软土地基的极限承载力的影响。水灰比的增加对增大其极限承载力效果显著,而厚度的增加对提高双层地基极限承载力效果不显著。对双层地基的极限承载力进行了分析,提出了极限承载力的修正公式,并把计算值与试验值做了对比分析。

This paper analyses laboratory model tests of double-layer subgrade and investigates the influences of changes in the thickness of soft clay overlying hard soil layer and water-cement ratio on the ultimate bearing capacity of soft soil foundation overlying hard soil layer.It is shown that the increased water-cement ratio has a remarkable impact on the increases in the ultimate bearing capacity,while increases in the thickness do not have obvious effects on the increase of the ultimate bearing capacity of double-layer subgrade.Furthermore,this paper analyses the ultimate bearing capacity of double-layer subgrade,puts forward the amendment formula of the ultimate bearing capacity,and carries out a comparative analysis between the calculated results and the experiment data.