泡沫轻质土路堤底部基底压力分布特征及影响分析  

Distribution and Influence Analysis of Base Pressure at the Bottom of Foamed Light Soil Embankment

作　　者：孙旭东[1] 杨平 李美霞 张超 SUN Xudong;YANG Ping;LI Meixia;ZHANG Chao(China Railway Group Limited,Beijing 100844,China;China Railway Pearl River Delta Investment Development Co.,Ltd.,Foshan 528300,Guangdong,China;CCCC First Highway Consultants Co.,Ltd.,Xi an 710075,China)

机构地区：[1]中国中铁股份有限公司,北京100844 [2]中铁珠三角投资发展有限公司,广东佛山528300 [3]中交第一公路勘察设计研究院有限公司,西安710075

出　　处：《路基工程》2018年第5期45-48,共4页Subgrade Engineering

基　　金：国家重点研发计划(2016YFC0802203)

摘　　要：泡沫轻质土是近几年广泛应用于高速公路路堤填筑等方面的一种新型轻质材料。考虑到泡沫轻质土路堤填料与传统路堤填料之间较大的差异性,结合广佛江一期试验段现场监测资料,采用数值分析方法对不同弹性模量下泡沫轻质土路堤底部基底压力分布特征进行了研究。结果表明:随着泡沫轻质土路基浇筑高度及弹性模量的增加,基底压应力分布不均匀性逐渐增加,所受拉应力及弯矩也逐渐增大;地基底面最大沉降及差异沉降量随着路基弹性模量增大逐渐减小,趋向于整体下沉。Foamed light soil is a new type of light material widely used in highway embankment filling and other aspects in recent years.Considering the large difference between the fillers of foamed light soil embankment and the traditional embankment,combined with field monitoring data of the first phase test section of the Guangfojiang fast track,the numerical analysis method was used to study the distribution characteristics of the base pressure of the foamed light soil embankment under different elastic modulus.The results show that:With the increase of the height and elastic modulus of the foamed light soil subgrade,the distribution inhomogeneity of compressive stress at the base gradually increases and the tensile stress and bending moment also increase.The maximum settlement and differential settlement of the base surface gradually decrease with the increase of the elastic modulus of the subgrade,tending to sink as a whole.

关 键 词：泡沫轻质土 软土地基 路堤 基底压力 差异沉降 

分 类 号：U416.122[交通运输工程—道路与铁道工程]