灰土挤密桩处理公路路基效果研究  

Research on the Effect of Lime-soil Compaction Pile on the Treatment of Highway Subgrade

作　　者：孙本章 Sun Benzhang(Shanxi Road&Bridge Co.,Ltd.,Taiyuan 030000,China)

机构地区：[1]山西路桥股份有限公司,太原市030000

出　　处：《北方交通》2024年第12期46-49,共4页Northern Communications

摘　　要：某湿陷性黄土公路路基采用灰土挤密桩进行加固处理,文章依托该工程背景,利用数值软件建立三维数值模型,分析了挤密桩桩长和桩径对桩身应力、桩土间径向应力和沉降值的影响规律。研究表明,沿深度方向,桩身应力约在1.6m处达到峰值,侧摩阻力约在2m处达到峰值。增大挤密桩桩长,最大桩身应力随之增大,最终沉降值随之减小。增大挤密桩桩径,桩身可以承担更多的荷载,桩土应力比也逐渐增大。但当桩长和桩径超过一定值后,挤密桩加固提升效果有限。因此,认为该工程的合理桩长在9.0~10.5m,合理桩径在350~450mm。The reinforcement treatment is carried out on a collapsible loess highway subgrade with the lime-soil compaction pile.Taking the project as the background,the three-dimensional numerical model is established by using the numerical software,and the influence rules of compaction pile length and pile diameter on the pile stress,radial stress between piles and soil and settlement value are analyzed.The research shows that,along the depth direction,the pile stress reaches a peak at about 1.6m,and the lateral friction resistance reaches a peak at about 2m.With the increase of the compaction pile length,the maximum pile stress increases,and the final settlement value decreases.By increasing the compaction pile diameter,the pile body can bear more load,and the pile-soil stress ratio gradually increases.However,when the pile length and pile diameter exceed a certain value,the lifting effect of the compaction pile reinforcement is limited.Therefore,it is considered that the reasonable pile length of the project is 9.0~10.5m,and the reasonable pile diameter is 350~450mm.

关 键 词：湿陷性黄土 公路路基 灰土挤密桩 施工参数 

分 类 号：U416.1[交通运输工程—道路与铁道工程]