随着当前交通量的迅速增长，高速公路面临着扩建加宽的问题，尤其是对于软土地的地基，高速公路路基的加宽更需要考虑路基的沉降差以及路基的整体稳定。先对软基处理技术和拓宽理论进行相关的概述，再对当前我国高速公路扩建加宽的现状与问题进行了相关的分析，最后再从已建老路基沉降的观测、新路基复合地基的处理方法以及提高路基整体性与抗裂能力等几方面来对软基上路基拓宽的关键技术进行了相关的分析，希望对我国软土地基上高速公路路基扩建加宽技术的建设能有一定的指导与借鉴意义。%With the rapid growth of the traffic volume , the highway faces widening problems , especially on soft soil foundation .The differential settlement of subgrade and the overall stability of roadbed should be considered . In this paper , the processing technology of soft foundation is explained and the related theories are summarized , the present situation and problems of the current highway widening in China are analyzed , the key technology is illustrated from view points of the old roadbed settlement , the new composite foundation and the integrity andanti cracking ability improvement , which has some guidance and reference for the construction of China's soft soil em-bankment widening of expressway .
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