水泥搅拌桩连续墙应用于高速公路软土地基处治的数值分析

采用排水固结法处治淤泥土或泥炭土时不但需要较长的时间,而且需要严格控制施工过程,避免路堤发生失稳破坏。为了减少软土路堤的施工时间和增大路堤的稳定性,提出一种新的高速公路软土地基处治方法,即在软土路堤施工前在路堤坡角两侧设置水泥搅拌桩连续墙,通过减少软土的侧向挤出,实现降低路堤的工后沉降和提高路堤稳定性的目的。为了评价该地基处理方法对高速公路软土地基的处治效果,利用有限元软件PLAXIS对设置水泥搅拌桩连续墙后软土路堤的沉降、水平变形和安全性进行深入的理论研究,并与未设置水泥搅拌桩连续墙的软土路堤的理论分析结果进行比较。比较结果表明,在软土路堤坡角两侧设置水泥搅拌桩连续墙不但可以减少软土路堤的沉降,而且提高了路堤稳定性,减少了软土路堤的施工时间。

Numerical Analysis of the Diaphragm Wall of Mixing Piles for Expressway on Soft Ground

Stability and deformation is the key problem of design about the embankment on soft soil.The strength of mucky clay or peat increase due to ground consolidation,the consolidation need too much time and need to control the construction procedure to avoid embankment corrupt.The new foundation treatment method of expressway soft soil ground is given.The diaphragm walls of deep mixing piles are located at the toe of embankment to make consolidation time short and increase the stability of embankment.The diaphragm wall of deep mixing piles can reduce lateral squeezing settlement,it decrease the settlement after the construction of embankment and increase the stability of embankment.For evaluation the treatment effect of the method,PLAXIS software is used to study the settlement、lateral deformation and stability factors of the embankment on soft soil with or without the diaphragm wall of mixing piles.The theory results show that The diaphragm walls of mixing piles at the toe of embankment can decrease settlement and increase the stability factors of embankment.It can reduce much construction time.The prospect of the new foundation treatment method is brightening.