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泡沫混凝土置换路堤对基底压力及沉降的影响

作者：彭子茂1，2，宁英杰3，叶林杰3，何智钢3，吴宏3，夏新华3，刘伟彬4

关键字：泡沫,混凝土,置换,路堤,对,基底,压,力及,沉降,

　
（1.湖南交通职业技术学院，湖南 长沙  410132；2.长沙理工大学，湖南 长沙  410114；
3.浙江交工新材料有限公司，浙江 杭州  311400；
4.内蒙古北方时代设计研究院股份有限公司，内蒙古 赤峰  024000）
    摘要：为研究泡沫混凝土置换路堤对基底压力及沉降的影响，结合某工程案例，采用FLAC3D软件建立6种不同路堤置换模型，分析路用泡沫混凝土的不同置换形式对地基压力和路基沉降变化规律。结果表明：计算路用泡沫混凝土置换路堤时，需考虑路用泡沫混凝土自身刚度对基底压力的影响；路用泡沫混凝土对减小基底压力的分布具有较好作用，且随着置换厚度增加效果越显著；路用泡沫混凝土置换层位于路堤底部的置换形式要优于路用泡沫混凝土置换层位于路堤中上部形式；路用泡沫混凝土置换厚度越大，其半刚性路堤的性质越显著，表现为沉降量系数减小越明显。
    关键词：路堤置换；泡沫混凝土；基底压力；沉降；FLAC3D
    中图分类号：TU528.2        文献标识码：A        文章编号：1001-702X（2020）09-0163-05
 
Effect of foam concrete replacement embankment on foundation pressure and settlement
PENG Zimao1，2，NING Yingjie3，YE Linjie3，HE Zhigang3，WU Hong3，XIA Xinhua3，LIU Weibin4
（1.Hunan Traffic Vocational and Technical College，Changsha 410132，China；
2.Changsha University of Technology，Changsha 410114，China；
3.Zhejiang Gongjiao New Materials Co. Ltd.，Hangzhou 311400，China；
4.Inner Mongolia Northern Times Design and Research Institute Co. Ltd.，Chifeng 024000，China）
    Abstract：In order to study the influence of foam concrete replacement embankment on foundation pressure and settlement，six different embankment replacement models are established by FLAC3D software，and the variation of foundation pressure and subgrade settlement caused by different replacement forms of foam concrete for road is analyzed. The results show that the influence of pavement foam concrete stiffness on foundation pressure should be considered when replacing embankment with foam concrete. Pavement foam concrete plays a better role in reducing the distribution of foundation pressure，and with the increase of replacement thickness，the effect is more remarkable；the replacement form of road foam concrete replacement layer at the bottom of embankment is better than that of road foam concrete replacement layer in the middle and upper part of embankment；the larger the replacement thickness of road foam concrete is，the more significant the properties of semi-rigid embankment are，and the more obvious the decrease of settlement coefficient is.
    Key words：embankment replacement，foam concrete，basement pressure，settlement，FLAC3D