软土地基上高速公路路基扩建加宽中的关键问题

随着交通量的迅速增长,部分建成通车的高速公路又面临着扩建加宽的问题。在软土地基上,高速公路路基的加宽工程要考虑路基的整体稳定和差异沉降问题。因为新路基的建设会引起路基边坡失稳和新老路基的差异沉降,所以软土地基上高速公路路基加宽的关键问题就是如何减小新老路基之间的差异沉降,并保证新老路基之间的有效连接。本文就此问题进行回顾和总结,并在此基础上提出几点建议。

Key Problems in Embankment Widening of Expressway on Soft Ground

With the increase of traffic volumes,exiting expressway often demands embankment widening.Problems in embankment widening are usually associated with overall stability and differential settlement due to soft soils beneath the embankment.New fills on soft soils may induce additional settlements,slope instability and differential settlements between old and new fills.The key problems in the embankment widening of expressway on soft ground are how to eliminate settlements and ensure the effective connection between old and new fills.The review on design and construction solutions for the above problems is presented,and some suggestions are proposed in the paper.