管桩处理软土地基后发生大位移的分析

Large Displacements in a Soft Soil Embankment Treated by Pipe Piles

在广东某高速公路工地,对软基地段进行实时监测,在路基累计填土高度仅有4.97m时,最大累计沉降量为443mm,最大累计侧向位移达168.56mm;该段软土地基的处理方式为管桩复合地基。出现该问题后,通过静力触探对该地段进行补勘,并利用软件对路堤进行稳定性分析,获得了最终沉降、侧位移量。结果显示:该路段的最终沉降及侧位移在一个合理的范围之内;对数据结果分析发现,管桩处理后的软土地基在沉降方面出现"先大后小"的现象;对前期填方中的大位移量进行了分析。

This paper presents a case history of the ground improvement monitoring results in the mountain area of Guangdong Province.The expressway embankment over the soft soils was improved by the pipe piles.When the embankment height was only 4.97 meters,the observed maximum vertical settlement was 443 millimeters and the maximum lateral deflection was 168 millimeters.Additional geotechnical investigations by the cone penetrometer testing were performed and the stability of the embankment was re-evaluated.The ultimate vertical settlement and lateral movement were predicted.The results indicate that,the ultimate vertical and lateral deformations are within the controllable range.From the monitored data,the embankment deformation rate have the characterization of rapid in the initial stage and would gradually reduce the rate.