Prefabricated vertical drains combined with preloading and staged construction is a frequently used technique to accelerate consolidation in soft soils. Nevertheless, an installed vertical drain discharge capacity rapidly reduces over consolidation. Most reasons are the lateral confining pressure, the drain deformation and filter clogging. This greatly affects the rate of consolidation by increasing well resistance. This article presents an exact solution under equal-strain consolidation case of progressive loading. Total vertical stress increase caused by loading is principally modelled as a linear curve depending on time and depth. The discharge capacity of the drain is supposed to lower linearly with depth and inversely with time. The smear effect is also considered by assuming constant permeabilities of the soil in both smear zone and undisturbed zone. Excess pore-water pressure at any arbitrary point in soil is assessed, and the global average degree of consolidation is found. Comparisons are made with an available solution from the literature. The suggested solution is then applied to three pre-loading embankments of the Moroccan high-speed railway project. A good agreement is found between the solution and measured data from field monitoring.

预制垂直排水沟结合预加载和分阶段施工是加速软土固结的常用技术。但是，已安装的垂直排水装置的排水能力会迅速降低其过度固结的能力。主要原因是侧向围压，排水变形和过滤器堵塞。这会通过增加井阻力来极大地影响固结速率。本文提出了在渐进荷载的等应变固结情况下的精确解决方案。由载荷引起的总垂直应力增加主要根据时间和深度建模为线性曲线。漏极的放电容量应随深度线性降低，随时间成反比。还可以通过假设污迹区和未扰动区的土壤渗透率恒定来考虑污迹效应。对土壤中任意位置的孔隙水压力进行了评估，得出了全球平均固结度。使用文献中的可用解决方案进行比较。然后将建议的解决方案应用于摩洛哥高速铁路项目的三个预装路堤。在解决方案和现场监测的测量数据之间找到了很好的协议。