<p>Considering the boundary time effect and non-Darcian flow, the one-dimensional nonlinear consolidation equation for soft soil subjected to time-dependent loading is derived. The finite difference method is employed to solve the consolidation equation, and the accuracy of the proposed solution is validated by comparison with existing solutions. Based on the obtained solutions, the effects of load parameters, interface parameters, flow parameters, and nonlinear parameters on the consolidation characteristics of the soil are further analyzed. The findings indicate that the excess pore water pressure and settlement rate of the soil increase with improved boundary drainage performance; however, the total settlement of the soil remains unaffected by boundary drainage performance. An exponential increase in non-Darcian flow results in a slower dissipation rate of excess water pressure within the soil, thereby reducing the settlement rate. Additionally, the consolidation rate of the soil decreases as the ratio of the compression index to the permeability index increases. Furthermore, the nonlinearity of the soil and its boundary drainage behavior exert a combined effect on soil consolidation.</p>