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软土具有压缩性大、渗透性低和固结变形时间长等特点,往往还有一定的超固结特性,这些特性给地基沉降的预估和计算增加了难度。统一硬化模型(UH模型)能够描述超固结土的硬化、软化、剪缩和剪胀等应力-应变特性以及应力路径对它的影响,其参数与剑桥模型相同。通过应用该模型,对三轴试验进行有限元分析,并对有限元分析结果与单元预测的结果进行对比。最后,结合某一工程实例对路堤变形进行三维有限元分析,分析和对比超静孔隙水压力、地表沉降和水平位移的变化规律。
Soft soil has the characteristics of large compressibility, low permeability and long consolidation deformation time, and often has some characteristics of over-consolidation. These characteristics make the prediction and calculation of foundation settlement more difficult. The uniform hardening model (UH model) can describe the stress-strain characteristics of overconsolidated soils, such as hardening, softening, shearing and dilatancy, and the influence of stress paths on the same, with the same parameters as the Cambridge model. Through the application of this model, the finite element analysis of the triaxial test is carried out, and the results of the finite element analysis and the unit prediction are compared. Finally, a three-dimensional finite element analysis of embankment deformation is carried out based on an engineering example to analyze and compare the variation of excess pore water pressure, surface subsidence and horizontal displacement.