The rigid composite foundation is used in an oil tank project.In view of the phenomenon of large sedimentation rate and not converging deformation of the rigid composite foundation during water testing,the failure reasons and bearing behavior of this composite foundation are analyzed with numerical calculation.The analysis results show that the thick layer of soft soil and its uneven distribution in project site are the root reasons of foundation failure.The larger deformation occurs in the side of soft soil with greater thickness,which resulting in an excessive differential settlement.The pit excavation near the tank also has some influence on foundation failure.The stress ratio between pile and soil is about 7 when the settlement of composite foundation is more than 60 cm,which indicating that the utility of piles in composite foundation has not been fully realized.%针对某储油罐工程刚性复合地基在试水过程中沉降过速且变形不收敛的现状,对该复合地基的失效原因及其承载性状进行了数值计算分析.结果显示,工程场地分布的厚层且不均匀软土是该地基失效的根本原因,在软土厚度较大一侧地基发生较大变形,形成过大的沉降差;油罐附近基坑的开挖对地基失效也有一定的影响;复合地基沉降超过60 cm时,桩土应力比约为7,说明复合地基中桩的效用没有得到充分发挥.
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