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基于非牛顿指数描述的非达西渗流定律,同时考虑地基内部竖向附加应力随深度线性变化以及变荷载的影响,建立了一维固结控制方程并应用有限差分法进行数值求解,同时对不同参数单级加荷下的固结性状进行分析。结果表明:基于非达西渗流比达西渗流下固结速率要慢,且渗流模型中非牛顿指数越大,土层的固结速率越慢;土层厚度越厚,固结速率越慢,因此,传统固结理论中室内土样与地基土层之间的相似关系不再成立;作用于土层的平均附加应力越大,土层的固结速率越快;在单面排水情况下,附加应力分布对土层固结速率有较大影响;相反,双面排水条件下土层固结速率与附加应力的分布是无关的;荷载的加荷速率越快,则土层的固结速率越快。最后,讨论了达西渗流计算固结变形的适用范围。
Based on the non-Darcy flow law described by non-Newton index, a one-dimensional consolidation control equation is established and the numerical solution is solved by using the finite difference method while taking into account the influence of the vertical additional stress in the foundation with the linear change in depth and the variable load. The parameters were analyzed under single-stage loading with consolidation behavior. The results show that the rate of consolidation under Darcy flow is slower than non-Darcy flow, and the non-Newtonian index is larger in the seepage model, the slower the consolidation rate is. The thicker the soil, the slower the consolidation rate, Therefore, the similarity between the indoor soil sample and the foundation soil layer in the traditional consolidation theory is no longer valid. The larger the average additional stress acting on the soil layer, the faster the consolidation rate of the soil layer. Under the condition of single- In addition, the consolidation rate of soil layer is independent of the distribution of additional stress under the condition of double-sided drainage. The higher the loading rate of soil, the consolidation rate of soil layer The faster. Finally, the applicability of Darcy percolation to calculate the consolidation deformation is discussed.