Soft soils in hilly and mountainous areas ware clay soils with great amount organic which sink in gentle gully to silting up, and their causes and characteristics were not completely same with lacustrine and marine soft soils. Combined with the engineering properties of soft soil subgrade in the mountain conditions of Liuyang-Liling highway, the optimization treatment plan reinforced by gravel pile and the upper confining geogrid was put forward following comprehensive comparison of replacement method and composite subgrade methods with their technical and economical efficiency. Considering the bearing capacity of subgrade improved by drainage and consolidation of gravel pile, the bearing capacity calculation method of composite subgrade is proposed, which may provide guidance for the construction and design of Liuyang-Liling highway, and also for the soft soil subgrade treatment in mountain area.%山区丘陵地区软土多为该区域大量含有机质的粘性土,汇积于平缓沟谷后淤积成软土,其成因及特性并不完全与海相、湖相软土相同.结合浏醴高速公路中山区条件下软土地基的工程特性,综合对比换填处治及复合地基处治方法的技术、经济优越性,提出碎石桩及其上部土工格栅套箍加劲优化处治方案,在考虑碎石桩固结排水提高地基承载力特性的基础上,提出其复合地基承载力计算方法,指导浏醴高速公路软土地基处治施工与设计,为山区软土地基处治提供指导.
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