The quality requirement is very high on expressway soft foundation improvement compared to the super pre-loading and the jet-powder pile, the vacuum-heaped load combining pre-compression is cheaper and its intensify effect is distinct 高速公路软基处理质量要求高,与传统等超载预压和粉喷桩加固软基相比,真空堆载联合预压加固效果明显,费用低。