中文摘要：

用真空预压法加固吹填土地基需要利用大型机械插入塑料排水板。提出在吹填土上吹填一层粉细砂形成硬壳层,以提高地基的承载能力,来满足插板机的承载力要求的新工艺。首先通过小比尺模型试验验证硬壳层地基对于提高地基承载力的有效性,探讨具有硬壳层的地基的承载特性和机制,采用PLAXIS有限元分析软件对硬壳层厚度与荷载宽度和承载力关系进行系统的分析计算,将数值计算结果与Vesic公式计算结果比较,对具有粉细砂形成的硬壳层对上硬下软的地基承载力的贡献做出定量的研究,并给出塑性区和位移场的开展状况,为该工艺提供理论依据。

英文摘要：

When the vacuum preloading method is applied to improve dredge fill, adequate bearing capacity needs to be provided for the large-scale spile machine installation equipment. A new technique is developed, in which the dredge surface is filled with a certain thickness of silt sand to provide enough bearing capacity to support the spile machine installation performance. A small-scale model test is carried out to intuitively identify the availability of crust improving the bearing capacity of foundation; and bearing characteristics and mechanism of foundation with crust are discussed. Finite element analysis is performed by PLAXIS software, in which the development of the plastic zones and displacement fields can be obtained. The calculated bearing capacity is compared with the analytical solutions achieved by Vesic formula. The contribution of a crust layer with silt sand to the bearing characteristics of foundation in rigid upper layer and soft lower layer is discussed, which can provide the technique with solid theoretical basis.