上海湖沼平原浅层硬土对单桩承载力的影响

Influence of shallow leck on bearing capacity of single piles in lagoon-marsh deposits area of shanghai

从现有计算单桩承载力的方法出发,结合工程实践分析上海湖沼平原地区浅层硬土对预制短桩承载力的影响。上海泻湖沼泽平原地区的地基土层次分布与上海市区滨海平原有较大差别,存在较厚的浅部硬塑态粉质粘土和中密性砂质粉土层(称为浅层硬土),该层土具有压缩性低、承载力高的特点。通过现场静载荷试验比较了按现行规范计算单桩承载力和实测结果的差异,分析了浅层硬土中预制短桩的极限侧摩阻力,讨论了侧摩阻力和静力触探比贯入阻力的关系,所得研究结果可为今后相关场地的类似工程建设提供参考。

Bearing capacity of short precast pile in lagoon-marsh deposits area of Shanghai is researched based on in-situ data. In lagoon-marsh deposits area, there imbeds a thick layer of hard sandy silt and medium dense silty sand, which is so-called as shallow leck. Ultimate frictional resistance of the shallow leck for single pile can be obtained from the field loading test. The relationship between the ultimate frictional resistance and cone penetration resistance of the shallow leck is analyzed by comparing the test result and computing value of bearing capacity of single pile.