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采用简化的k-σ′和mv-σ′分段模型,通过把结构性土一维固结问题转化为上、下层土体厚度不断变化的双层地基一维固结问题,得出了变荷载下结构性土一维固结近似解,并与数值解对比验证了解的合理性。分析结构破坏后渗透系数和体积压缩系数的变化分别对结构性土固结特性的影响表明,在固结系数减小程度相同的情况下,渗透系数减小程度增加则按孔压定义的固结度减小程度加大,而体积压缩系数不断增加则按变形定义的固结度减小程度加大;固结过程中按孔压定义的固结度大于按变形定义的固结度,且随着体积压缩系数增加程度加大,二者的差距加大。
By using the simplified k-σ ’and mv-σ’ model, the one-dimensional consolidation of structural soil is transformed into the one-dimensional consolidation problem of two-layer foundation with the changing thickness of upper and lower soil layers. The approximate solution of one-dimensional consolidation of structural soil under load is verified and compared with the numerical solution to verify the reasonableness of the solution. The analysis of the influence of the change of permeability coefficient and volumetric compression coefficient on the consolidation behavior of structural soil after structural failure shows that under the same degree of reduction of consolidation coefficient, the decrease of permeability coefficient increases according to the consolidation of pore pressure definition Degree of reduction increases, while the volumetric compression coefficient increases according to the definition of the degree of consolidation to reduce the degree of consolidation; consolidation process according to the definition of pore pressure consolidation degree is greater than the definition of deformation according to the degree of consolidation, and with With the increase of volumetric compression coefficient, the gap between the two increases.