广清高速公路交通流量大,道路拓宽施工和道路运营并行开展,软基路堤拓宽工期压力大,采用排水法处理的老路软土地基附加沉降时间长,软基路堤拓宽地基加固方案应满足工期目标和规避老路附加沉降问题。借鉴同类工程经验,基于该工程地基软土性状,依据预应力管桩单桩承载力实测结果,充分比较了水泥搅拌桩、素混凝土桩和预应力管桩加固方案,结合造价分析和工艺特点比较,提出预应力管桩大间距方案,用于软基路堤一般路段拓宽地基加固是可行的。 Guang-Qing Expressway traffic flow, road widening construction and road operations in parallel, soft ground embankment to widen the construction period pressure, the use of drainage method to deal with the old road additional settlement of soft ground for a long time, the soft ground embankment to broaden the foundation reinforcement program should meet the construction period objectives And avoid the additional settlement of the old road. Based on the engineering experience of similar projects, based on the properties of the soft soil in the foundation of the project, based on the measured results of the bearing capacity of single pile of prestressed tubular pile, the reinforcement scheme of cement mixing piles, plain concrete piles and prestressed pipe piles is fully compared with the cost analysis and process characteristics , Put forward the prestressed pipe large spacing program for the soft ground embankment extension of the general section of the foundation is feasible.