桩承式路堤土拱效应发挥过程研究

›› 2013, Vol. 34 ›› Issue (5): 1367-1374.

桩承式路堤土拱效应发挥过程研究

费康^{1, 2}，陈毅¹，王军军¹

1. 扬州大学岩土工程研究所，江苏扬州 225127；2. 河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098

收稿日期:2012-03-02 出版日期:2013-05-10 发布日期:2013-05-14
作者简介:费康，男，1978年生，博士，副教授，主要从事地基基础工程方面的研究工作。
基金资助:
国家自然科学基金项目(No. 50908198)；江苏省高校自然科学研究基金项目(No. 09KJB580004)；河海大学岩土力学与堤坝工程教育部实验室开放基金项目(No. GH200805)；江苏省青蓝工程资助项目。

Study of development of soil arching effect in piled embankment

FEI Kang^{1, 2}，CHEN Yi¹，WANG Jun-jun¹

1. Institute of Geotechnical Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China

Received:2012-03-02 Online:2013-05-10 Published:2013-05-14

摘要/Abstract

摘要： 通过三维模型试验对桩承式路堤中土拱效应发挥过程进行了研究，重点分析了不同桩顶盖板尺寸、不同加筋方式下应力折减系数与差异沉降之间的关系。结果表明，土拱效应随变形的增加而发挥；加筋材料的设置减小了差异沉降，削弱了填土中的土拱效应，荷载向桩顶的传递是土拱效应和拉膜效应共同作用的结果。采用有限元法对桩间距、填土高度等未能在模型试验中考虑的关键因素进行了参数敏感性分析，总结了土拱效应发挥过程的相关规律。根据有限元计算结果、试验数据和文献中收集到的实测资料，提出用土拱效应发挥系数和归一化位移来描述土拱效应的发挥过程，建议二者之间采用双曲线方程模拟，从而在设计中体现土拱效应随位移的发展，并满足路堤填土、加筋材料和地基之间的变形协调要求。

关键词: 桩承式路堤, 土工加筋材料, 土拱效应, 差异沉降, 模型试验, 有限元

Abstract: In order to study the development of soil arching in the piled embankment, a series of three-dimensional model tests are conducted. The relationships between stress reduction ratio and ground settlement with different pile cap sizes and different geosynthetic reinforcement materials are analyzed in detail. Based on the test results, it is shown that the effect of soil arching develops gradually with differential settlement and it is more significant at large differential settlement. The inclusion of geosynthetic reinforcements reduces the differential settlement and weakens the soil arching effect correspondingly; and the load transfer from soil to pile top is caused by the combination of soil arching effect and tension membrane effect. The finite element sensitivity analyses are also carried out to study the effects of pile spacing, embankment height and other factors which did not included in the model tests. The focus of numerical analysis are laid on the development process of the soil arching effect and an index is proposed to describe the mobilized degree of the soil arching. Based on the test data, the results of the finite element analyses, and the experimental data collected from literature, a hyperbola equation is suggested to describe the relationship between the mobilized degree of the soil arching and the normalized deformation. The given equation can be used to account the development of soil arching with settlement.

Key words: piled embankment, geosynthetic reinforcement, soil arching effect, differential settlement, model test, finite element method

中图分类号:

TU 473

费康，陈毅，王军军 . 桩承式路堤土拱效应发挥过程研究[J]. , 2013, 34(5): 1367-1374.

FEI Kang ，CHEN Yi ，WANG Jun-jun . Study of development of soil arching effect in piled embankment[J]. , 2013, 34(5): 1367-1374.

参考文献

相关文章 15

[1]	王国辉, 陈文化, 聂庆科, 陈军红, 范晖红, 张川, . 深厚淤泥质土中基坑开挖对基桩影响的离心模型试验研究[J]. 岩土力学, 2020, 41(2): 399-407.
[2]	陈贺, 张玉芳, 张新民, 魏少伟, . 高压注浆钢花管微型桩抗滑特性足尺模型试验研究[J]. 岩土力学, 2020, 41(2): 428-436.
[3]	黄宇华, 徐林荣, 周俊杰, 蔡雨, . 基于改进Terzarghi方法的桩网地基桩土应力计算[J]. 岩土力学, 2020, 41(2): 667-675.
[4]	孙锐, 杨峰, 阳军生, 赵乙丁, 郑响凑, 罗静静, 姚捷, . 基于二阶锥规划与高阶单元的自适应上限有限元研究[J]. 岩土力学, 2020, 41(2): 687-694.
[5]	雷华阳, 胡垚, 雷尚华, 祁子洋, 许英刚, . 增压式真空预压加固吹填超软土微观结构特征分析[J]. 岩土力学, 2019, 40(S1): 32-40.
[6]	于一帆, 王平, 王会娟, 许书雅, 郭海涛, . 堆积层滑坡地震动力响应的物理模型试验[J]. 岩土力学, 2019, 40(S1): 172-180.
[7]	叶观宝, 郑文强, 张振, . 大面积填土场地中摩擦型桩负摩阻力分布特性研究[J]. 岩土力学, 2019, 40(S1): 440-448.
[8]	王东坡, 陈政, 何思明, 陈克坚, 刘发明, 李明清, . 泥石流冲击桥墩动力相互作用物理模型试验[J]. 岩土力学, 2019, 40(9): 3363-3372.
[9]	陈宇龙, 内村太郎, . 基于弹性波波速的降雨型滑坡预警系统[J]. 岩土力学, 2019, 40(9): 3373-3386.
[10]	王钦科, 马建林, 陈文龙, 杨彦鑫, 胡中波, . 上覆土嵌岩扩底桩抗拔承载特性离心模型试验及计算方法研究[J]. 岩土力学, 2019, 40(9): 3405-3415.
[11]	卢谅, 石通辉, 杨东, . 置换减载与加筋复合处理方法对路基不均匀沉降控制效果研究[J]. 岩土力学, 2019, 40(9): 3474-3482.
[12]	杨文波, 邹涛, 涂玖林, 谷笑旭, 刘雨辰, 晏启祥, 何川. 高速列车振动荷载作用下马蹄形断面隧道动力响应特性分析[J]. 岩土力学, 2019, 40(9): 3635-3644.
[13]	赵密, 欧阳文龙, 黄景琦, 杜修力, 赵旭, . P波作用下跨断层隧道轴线地震响应分析[J]. 岩土力学, 2019, 40(9): 3645-3655.
[14]	蔡雨, 徐林荣, 周德泉, 邓超, 冯晨曦, . 自平衡与传统静载试桩法模型试验研究[J]. 岩土力学, 2019, 40(8): 3011-3018.
[15]	孙飞, 张志强, 易志伟. 正断层黏滑错动对地铁隧道结构影响的模型试验研究[J]. 岩土力学, 2019, 40(8): 3037-3044.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed