固化软土双层地基室内模型试验数值模拟研究*

利用有限元软件ABAQUS对上覆硬壳层双层地基室内模型试验进行数值模拟.通过分析等效塑性应变分布云图与位移矢量分布图,确定了双层地基的破坏形式为冲剪破坏；硬壳层厚度的增加减缓了下卧软土层变形区的开展,但是地基承载能力增加不明显；加入纤维素的固化剂提高了硬壳层的强度,增加了地基的承载能力.在地基破坏特征和极限承载力方面,数值模拟与模型试验所得结果的吻合程度较高.

Numerical simulation of indoor model test of double-layered soil with upper curing soft soil

This paper uses ABAQUS to make a numerical simulation of the indoor model test of double-layered soil with upper crust. Through the analysis of the contours of equivalent plastic strain and displacement vector, the failure mode of double-layered soil is proved to be punching failure. With the increase of upper crust thickness, the expansion of plastic deformation area in sub-soil delays while double-layered soil bearing capacity slightly improves. The curing agent which contains cellulose enhances the strength of upper crust, so that it helps to increase the bearing capacity. In terms of the failure characteristics and ultimate bearing capacity, the results of numerical simulation close to that of indoor model test.