饱和软土地基上高填方边坡工程设计

Stability Design of High Fills over Saturated Soft Soils

结合工程实例,介绍了饱和软土地基上高填方边坡工程的设计理念及过程。通过对饱和软土地基采用大格构式深层水泥搅拌桩加塑料排水板或砂桩排水固结的措施,尤其是在边坡前缘地段设置密集的格栅式桩群,坡脚设置反压平台,保证了高填方边坡产生深层滑移失稳破坏。在上部堆载与下部复合地基之间设置碎石砂砾垫层进行联接,防止并协调复合地基发挥作用。对边坡坡面及坡肩,采用植被保护或格构防护,防止雨水的冲刷,达到美化环境的目的。

This paper introduces the design concepts of the stability of a high fills over the saturated soft soils from a case study. The large distance cellular consisting of the cement mixed soil columns combined with the wick drains or sand columns accelerating the consolidation process, are proved to be an effective solution. In this method, closely spaced cement mixed soil columns should be installed in the area close to the toe of the fill, and a soil berm is usually placed at toe of the slope to increase the stability and to prevent the deeply seated failure mode resulting from the high fills. A gravel cushion is usually placed between the fills and the improved foundation soils. The slope face should also be protected by vegetation or concrete surface grids to prevent the soil erosions.