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日益增长的交通需求要求现有高速公路必须拓宽改建。如何获得满足沉降控制标准又效益最优的新路软基加固方案,成为软基上高速公路拓宽工程的主要技术问题。采用有限元法对佛开高速公路拓宽工程标准断面新路软基不同加固方案下的沉降进行数值分析,根据新路基最大沉降与新老路堤差异沉降控制标准,按沉降控制设计理论优化出不同软土厚度情况下新路软基处理方案和加固参数,即软土厚度小于10 m时采用悬浮水泥搅拌桩复合地基方案,内侧第一排桩距老路坡脚2 m;软土厚度10～15 m时采用带帽悬浮CFG桩复合地基方案,软土厚度15～25 m时采用隔离墙与带帽悬浮CFG桩组合处理方案。
Increasing traffic demand requires existing freeways to be broadened and rebuilt. How to obtain the new road soft foundation reinforcement scheme that meets the settlement control standards and has the most effective benefits has become the major technical issue of the highway widening project on soft ground. The finite element method is used to analyze the settlement of new road soft foundation of Fokai Expressway widening project. According to the settlement control standard of new subgrade and the new subgrade, according to the settlement control design theory, different soft Under the conditions of soil thickness, the new road soft foundation treatment and reinforcement parameters, that is, when the thickness of soft soil is less than 10 m, the cement-mixed piles composite foundation is used; the first row of piles on the inside is 2 m away from the old road; the thickness of soft soil is 10-15 m When using the CFG pile composite foundation with suspension suspended cap, when the thickness of soft soil is 15 ~ 25 m, the combination of the separation wall and the suspended CFG pile with cap is adopted.