间隔条形改良软基处理改扩建路堤承载变形数值分析  

Numerical Analysis of Bearing Deformation of Embankment for Trench Excavation Replacement and Soft Foundation Reconstruction and Expansion

作　　者：王健 饶亮 冯守中 孙立强[3] 解德山 郎瑞卿 WANG Jian;RAO Liang;FENG Shouzhong;SUN Liqiang;XIE Deshan;LANG Ruiqing(Anhui Chuning Expressway Co.Ltd.,Chuzhou 239200,China;School of Civil and Architectural Engineering,Chuzhou University,Chuzhou 239001,China;School of Architecture and Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Tianjin Urban Construction University,Tianjin 300384,China)

机构地区：[1]安徽滁宁高速公路股份有限公司,安徽滁州239200 [2]滁州学院土木与建筑工程学院,安徽滁州239001 [3]天津大学建筑工程学院,天津300072 [4]天津城建大学土木工程学院,天津300384

出　　处：《天津建设科技》2024年第6期20-25,共6页Tianjin Construction Science and Technology

基　　金：国家自然科学基金(52078336);中国博士后基金面上项目(2022M721000);中国科协青年托举工程(YESS20230586);天津市研究生科研创新项目(2022SKYZ179)。

摘　　要：针对传统换填和就地固化地基处理方法工程量大、经济性差等不足,提出了间隔条形改良处理公路改扩建工程软土地基,结合某高速公路改扩建工程,建立了能够较好反应间隔条形改良地基处理特性的数值分析方法,揭示了间隔条形改良地基处理方法工作机理和破坏模式,引入间隔比概念,分析了间隔比和改良材料对改扩建路堤承载变形特性的影响规律。研究表明:间隔条形就地改良处理可大幅度提高路堤承载能力和边坡稳定性,经济性较好;路堤的极限承载力随着间隔比的增加而减小,随着石灰掺量的增加而增加;随着间隔比的增大,路堤边坡稳定性系数逐渐降低,在高间隔比下,石灰掺量的提高对边坡的安全系数的提升影响并不大。In view of traditional replacement and in-situ solidification of foundation treatment methods have shortcomings such as large engineering volume and poor economic efficiency.This paper proposes the use of trenching and replacement to treat soft soil foundations in highway renovation and expansion projects.Based on the actual renovation and expansion project of a certain highway,a numerical analysis method that can better reflect the characteristics of trenching and replacement foundation treatment was established and verified.The working mechanism and failure mode of the trenching and replacement foundation treatment method were revealed,and the concept of replacement ratio was introduced,analyzed the influence of replacement ratio and replacement materials on the load-bearing deformation characteristics of reconstructed and expanded embankments.Research has shown that excavation and replacement can significantly improve the bearing capacity of embankments and slope stability,with good economic benefits;The ultimate bearing capacity of the embankment decreases with the increase of replacement ratio,and increases with the increase of lime content.As the replacement ratio increases,the stability coefficient of the embankment slope gradually decreases,and at high replacement ratios,the increase in lime content has little effect on the improvement of the safety coefficient of the slope.

关 键 词：改扩建路堤 间隔条形改良 承载能力 边坡稳定性 软基 

分 类 号：U416.1[交通运输工程—道路与铁道工程]