考虑Hansbo渗流时施工荷载下饱和黏土的一维固结

引入Hansbo渗流方程描述非Darcy渗流,考虑施工过程中荷载随时间的变化,修正了Terzaghi饱和黏土一维固结方程,建立了以有效应力为求解对象的非线性控制方程,并用有限体积法进行数值计算,讨论Hansbo渗流参数和施工速度对饱和黏土层固结特性的影响.计算结果表明:Hansbo渗流加剧了施工期孔压的累积,延缓了竣工后孔压的消散,地基的固结速度随Hansbo渗流参数增大而变慢,而施工速度仅对施工期和竣工初期的地基固结影响显著.

One-dimensional Consolidation of Saturated Clays under Construction Loadings Considering Hansbo flow

The Hansbo’s formula for non-Darcy flow is introduced to modify Terzaghi’s 1-D consolidation equation,and the modified equation is generalized to account for the consolidation case under time-dependent construction loadings.The dependent variable of the presented nonlinear consolidation equation is the effective stress,and numerical analysis is performed by using the finite volume method.Then the effects of the parameters of Hansbo flow and the rate of loading on the 1-D consolidation behaviors of saturated clay layers are investigated.The numerical results indicate that Hansbo flow causes the more accumulation of the pore water pressure in the construction period and delays its dissipation after construction,and the rate of settlement of the soil layer decreases with the increase of the parameters of Hansbo flow.In addition,the influence of loading rate on the consolidation behaviors is remarkable in the construction period and at the initial stage after its completion of construction.