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基于Gibson一维大应变固结理论和Hansbo径向固结理论,摒弃小应变假定,引入负压边界条件,建立了等应变条件下以孔隙比为变量的负压轴对称大应变固结(NALSC)模型.NALSC模型同时考虑了高含水率疏浚泥的材料和几何非线性、径竖向渗流、负压沿深度衰减等因素,其他学者建立的固结方程是NALSC模型的特例.基于线性化的材料参数,对固结度变化时程进行了数值模拟,结果表明,在不同的渗流条件和真空度衰减方式下,NALSC模型与现有模型的固结度计算值基本吻合;土层厚度与砂井有效加固直径比值不小于10时,土体主要发生径向固结,竖向固结可以忽略;NALSC模型的计算精度较高,适用于高含水率疏浚泥的大应变固结性状分析.
Based on Gibson one-dimensional theory of large strain consolidation and Hansbo radial consolidation theory, the small strain assumption is abandoned and the negative pressure boundary conditions are introduced to establish the negative pressure axisymmetric large strain consolidation (NALSC ) Model.NALSC model takes into account the material and geometric nonlinearity of dredged mud with high water cut, vertical and vertical seepage flow, the attenuation of negative pressure along depth and other factors, and the consolidation equation established by other scholars is a special case of NALSC model. The results show that the calculated values of consolidation degree of the NALSC model and the existing model are basically the same under different seepage conditions and the degree of vacuum attenuation. The relationship between the thickness of the soil layer and the sand The effective consolidation diameter ratio of not less than 10, the soil mainly radial consolidation, vertical consolidation can be ignored; NALSC model of high accuracy, suitable for dredging mud with high water content of large strain consolidation analysis.