混合刚度水泥土搅拌桩处治公路软基方案对比分析

Comparison and Analysis of Treatment Schemes of Cement-soil Mixing Pile with Mixed Stiffness for Highway Soft Foundation

以填方公路的软弱地基为处治对象,通过有限元软件对等刚度水泥土搅拌桩和混合刚度水泥土搅拌桩处治深厚软基的路面沉降和路堤稳定性进行了分析。分析结果表明:混合刚度水泥土搅拌桩加固方案的路基沉降曲线为浅碟形,最大、最小沉降值分别为227.0mm、206.2mm,最大沉降差为20.8mm,相比等刚度水泥土搅拌桩加固软弱地基方案的最大沉降差减小了35.8%,混合刚度的水泥土搅拌桩处治软弱地基的路堤稳定性系数为1.98,满足规范要求,可为该类工程的处治提供参考。

Taking the soft foundation of the filling highway as the treatment object,the pavement settlement and embankment stability of the deep soft foundation treated by the cement-soil mixing pile with equi-stiffness and the cement-soil mixing pile with mixed stiffness are analyzed by the finite element software.The analysis results show that:the subgrade settlement curve of the reinforcement scheme for the cement-soil mixing pile with mixed stiffness is shallow dish shape,the maximum and minimum settlement values are 227.0mm and 206.2mm respectively,and the maximum settlement difference is 20.8mm,which is 35.8%less than that of the reinforcement scheme for the cement-soil mixing pile with equi-stiffness.The embankment stability coefficient of the cement-soil mixing pile with mixed stiffness for treating the soft foundation is 1.98,which can meet the requirement of the specification and provide reference for the treatment of similar projects.