高等级公路海堤的软上地基处理是当前面临的崭新课题。本文首先总结了东南沿海的施工海域特点，认为在这种地质条件下，插设塑料排水板是一种行之有效的方法。它可以在软上层中形成竖向排水通道，加速孔隙水的排出和地基固结，减少工后沉降，提高地基上的承载力。本文在阐述塑料排水板地基处理机理的基础上，介绍了塑料排水板加固高等级公路海堤宜采用的堤身结构形式，并就此提出了施工的工艺和流程。并对其优缺点进行了讨论。

It is a new task of the motorway embankment foundation consolidation. At first, the construction sea area characteristic of the southeast littoral province was summarized. The conclusion was drawn that it was an effective method to driving the plastic drainage board in this geology condition. Driving the plastic drainage board could form the vertical drainage channel, accelerate the vent Of hole water and the concretion of clay, reduce the sedimentation after construction, enhance the load-bearing ability of the foundation. Based on describing the foundation consolidation mechanism of plastic drainage board, the embankment structure shape which should be used at the motorway embankment consolidating by plastic drainage board was introduced; along with the construction techniques and flow of plastic drainage board were recommended. Its Advantage and disadvantage were discussed at last.