您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7029(2015)05-1039-08
软土地基高速公路路基拓宽改建
蒋鑫123,蒋怡123,梁雪娇123,吴朝阳123,邱延峻123

(1.西南交通大学土木工程学院,四川成都 610031;
2.西南交通大学道路工程四川省重点实验室,四川成都 610031;
3.西南交通大学高速铁路线路工程教育部重点实验室,四川成都 610031
)

摘 要: 为研究软土地基高速公路路基拓宽改建全过程的变形特性,基于有限元数值模拟,对比分析一次性新建而成的窄路基、宽路基及拓宽改建而成的宽路基地基表面沉降、路基表面沉降及地基侧向变形等演变规律。研究结果表明:拓宽改建而成的路基较一次性新建而成的路基沉降演变过程复杂,沉降曲线形态由W型-U型-W型转变;老路基坡脚处地基侧向位移先向老路基一侧移动,再向新路基一侧移动而后又向内回缩。拓宽时应重视新老路基之间的相互作用;拓宽路基除应控制工后沉降外,同时应注意适当控制新路基施工期老路基的沉降及差异沉降。所获结论有助于工程实际沉降控制指标体系的合理确定、软基处治对策的科学选择。

 

关键字: 软土地基;路基拓宽;变形特性;相互作用;有限单元法

Numerical simulation on deformation behaviorsfor widened expressway embankment over soft ground
JIANG Xin123,JIANG Yi123, LIANG Xuejiao123,WU Chaoyang123,QIU Yanjun123

1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China;
3. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract:In order to study the deformation behaviors of expressway embankment over soft ground during the whole widening process, numerical models of newly built narrow embankment, newly built wide embankment and widened embankment were established based on the finite element numerical simulation. The developments of ground surface settlement, embankment surface settlement and ground lateral displacement of each model were compared and analyzed. The results show that widened embankment’s deformation behaviors are much more complicated than those of newly built embankment, and the settlement curve of widened embankment will change from W-type, to U-type, then to W-type. The ground under the old embankment toe lateral displacement moves to the side of old embankment, and then to the side of new embankment and later retracts. The interaction between old and new embankment should be taken seriously. Not only the post-construction settlement should be controlled, but also the settlement and differential settlement of old embankment during the new embankment construction should be focused on. These conclusions will be benefit in the determination of the settlement control index system and soft ground treatment measures.

 

Key words: soft ground; embankment widening; deformation behavior; interaction; FEM

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn