To explore the timeliness of boundary drainage and the consolidation characteristics of double-layered soil under non-Darcy flow conditions， the one-dimensional consolidation problem of double-layered foundation based on the exponential flow model was studied by introducing continuous drainage boundary conditions. Firstly， the finite difference method was used to solve the two-layered foundation consolidation with exponential flow under continuous drainage boundaries and obtain corresponding solutions， which were then compared and validated against existing research. Then， based on the deduction results， the effects of interface parameters， thickness ratio of upper to lower soil layers， permeability ratio of soil layers， and ratio of compression coefficients on the consolidation degree of the foundation were analyzed. The research results indicated that the larger the interface parameters， the faster the consolidation. However， as the flow index increased， the influence of the interface parameters on the consolidation rate of the double-layered foundation decreased. For the foundation with an upper soft and lower hard layer， a thicker lower harder layer led to faster consolidation； in contrast， for the upper hard and lower soft type， a thicker upper hard layer resulted in a slower consolidation rate. Compared with the flow index of the lower soil， the flow index of the upper soil had a greater impact on the consolidation of the foundation. Therefore， in order to accelerate the consolidation speed of the soil， different soil layers with different properties should be reasonably arranged during construction.
Zhang et al. (Wed,) studied this question.