Numerical Analysis of Soil Consolidation Coupled Biot Theory and Hansbo Flow

摘要

In this study, the governing equations of Biot plane consolidation are derived and numerically discretized based on large strain consolidation theory and considering the effect of nonlinear Hansbo flow. Numerical simulations of one-dimensional consolidation of a soft soil foundation are carried out using a finite element program to verify the reliability of the calculation procedure. The one- and two-dimensional consolidations of a soft soil foundation are numerically calculated through parameter variation and compared with Darcy flow to investigate the influence of nonlinear flow parameters iL and m on the consolidation process. The results show that the dissipation of excess pore water pressure is delayed under Hansbo flow compared with Darcy flow, which results in a slow soil consolidation rate. The difference between Darcy and non-Darcy flows becomes more pronounced with increasing consolidation time, and the delay caused by non-Darcy flow becomes more significant. Parameter m has a large hysteresis effect on the dissipation of excess pore water pressure, which becomes increasingly apparent for large m values. In comparison, the parameter iL has a small influence on soil consolidation and the delay becomes more notable for larger iL values.