PDF《有限元拓宽路基差异沉降特性和影响因素_有限元》

第7卷第1期2007 年2月交通运输工程学报Journal of T raffic and Transportation Engineering Vol.

7 No.

1 Feb.

2007 收稿日期 : 2006-

10 -

13 基金项目 : 国家西部交通建设科技项目(2005

318 812 13) 作者简介 : 傅珍(1976 - ), 女 ,河南鹤壁人 , 长安大学工学博士研究生 , 从事道路工程研究 . 导师简介 : 王选仓(1956 - ), 男 ,陕西西安人 , 长安大学教授 . 文章编号 : 1671- 1637(2007)01 -

0054 -

04 拓宽路基差异沉降特性和影响因素 傅珍1 ,王选仓1 ,陈星光2 ,李宏志3 ,史建平3 ,王磊3 (1 . 长安大学 特殊地区公路工程教育部重点实验室, 陕西 西安

710064 ;

2 . 广东省公路勘察规划设计院, 广东 广州 510507;

3 . 河南高速安新改建工程项目部, 河南 新乡 450003) 摘要: 为了解差异沉降对拓宽道路的影响 , 应用有限元程序 ,建立了差异沉降计算模型 , 分析 了拓宽路基差异沉降特性 , 研究了路基高度 、 土基压缩模量 、 拓宽方式和宽度对路基差异沉降以 及沉降曲线形态的影响 .结果表明, 双侧拼接在差异沉降控制上优于单侧拼接 ;

土基压缩模量 从2 M Pa 增加到

10 M Pa 时 ,最大差异沉降从 20.

58 cm 降低到 5.

46 cm , 且最大差异沉降的增加 和土基压缩模量的减小不成反比例 , 存在减速性 ;

当路基高度从

2 m 增加到

8 m 时, 最大差异沉 降从

6 .

38 cm 增加到 13.

10 cm , 受边界条件的影响 ,路基高度越小 ,拓宽路基顶面沉降曲线越接 近 ~ 形.关键词: 路基工程;

拓宽路基;

有限元方法 ;

差异沉降;

拓宽方式;

路基高度;

压缩模量 中图分类号 : U416.

1 文献标识码 : A Differential settlement characteristics and influencing factors of widening subgrade Fu Zhen

1 , Wang Xuan- cang

1 , Chen Xing- guang

2 , Li Hong- zhi

3 , Shi Jian- ping

3 , Wang Lei

3 (1 . Key Laboratory for Special Area Highw ay Engineering of Ministry of Education, Chang'

an University, Xi '

an 710064, Shaanxi , China;

2. Guangdong Highw ay Design Institute, Guangzhou 510507, Guangdong , China;

3 . Anxin Rebuilding Project Department of H enan Expressw ay Company , Xinxiang

450003 , H enan , China) Abstract: In order to know the influence of differential settlement on w idening subgrade , the differential settlement characteristics of w idening subgrade were analyzed by finite element method , and the influences of subgrade height , compressive modulus , w idening mode and w idth on the differential settlement and settlement curves of subgrade w ere studied. The result show s that differential settlement controlling on w idening road w ith tw o sides is better than that with one side, the maximum differential settlement decreases from 20.

58 cm to

5 .

46 cm w hen compressive modulus increases from

2 MPa to

10 M Pa , and the increase of the biggest differential settlement is not in inverse proportion to the decrease of compressive modulus , w hile presents slow dow n trend ;

the biggest differential settlement increases from

6 .

38 cm to

13 .

10 cm with subgrade height increasing from

2 m to

8 m , because of the influence of boundary conditions , the smaller the subgrade height is , the closer the settlement curve of widening subgrade top is to ~ .

1 tab ,

4 figs ,

11 refs. Key words :subgrade engineering ;

w idening subgrade ;

finite element method ;

differential settlement ;