【摘要】 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.更多还原

【Abstract】 Based on the Gibson one-dimensional large-strain consolidation theory and the Hansbo radial consolidation theory,abandoning the small strain assumption,introducing the negative pore water pressure boundary condition, the negative axisymmetric large-strain consolidation model( NALSC) with void ratio as a variable is established under the equal strain condition. The NALSC model considers the material and geometry nonlinearity,radial and vertical flows,and vacuum preloading attenuation along the depth of dredged clays with high water content. Equations established by other researchers are the special cases of the NALSC model. According to linearized material parameters,the numerical simulations of consolidation degrees change progress are carried out. Results showthat under different seepage conditions and vacuum decay methods,the predicted consolidation degrees of the proposed model are in good agreement with those of existing models. When the ratio of layer thickness and effective reinforcement diameter is not less than 10,the radial consolidation is produced,and the vertical consolidation can be ignored. The NALSC model has high calculation accuracy,and it can be used for large-strain consolidation property analysis of dredged clays with high water content.更多还原