Abstract: Numerous data show the deviation of the pore water flow from the Darcian law during low hydraulic gradient. Meanwhile, the classical small-strain consolidation theory becomes no longer applicable because of the large strain generated by soft soil with high compressibility under the external load. And the large strain will lead to the bending of the drainage body, the occurrence of silting, and other poor drainage conditions. Based on this, the Hansbo’s flow is used to describe the non-Darcian flow in soft soil, and the time-and-depth dependent well resistance model is used to describe the reduction of drainage capacity. The large-strain nonlinear consolidation model with vertical drain under time-dependent is presented, and its numerical solution is derived. The solution is compared with the existing solutions and an engineering case to verify its correctness. When analyzing the consolidation properties under different working conditions, it is found that the difference of consolidation degree between the Darcian flow and Hansbo’s flow can be as high as 10% only if the Hansbo’s flow parameters m and i₁ are within a reasonable value range. However, the difference between the two is less than 5% when the radius ratio is less than 13. At this time, the non- Darcian flow in the soil can be ignored. Once the radius ratio exceeds 13, it is necessary to consider the Hansbo’s flow. Variable well resistance leads to a gradual decrease of drainage capacity in vertical drain, and the difference of the consolidation degrees calculated by the variable well resistance and by the constant well resistance is up to 10% after considering the Hansbo’s flow. When the ratio H/r_e reaches 12.5, the vertical flow in soil has little effect, which will be even smaller with the increase of H/r_e and can be approximately ignored at this time.