路基填挖交界处路面裂缝的三维有限元分析

苗英豪; 胡长顺; 王秉纲

路基填挖交界处路面裂缝的三维有限元分析

长安大学公路学院, 陕西西安 710064

基金项目:

国家西部交通建设科技项目 2003 318 812 36

详细信息

作者简介:
苗英豪(1975-)，男，河北辛集人，长安大学博士研究生，从事路基路面工程研究

中图分类号: U416.01
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- 被引次数: 0
出版历程
- 收稿日期: 2005-07-14
- 刊出日期: 2005-12-25

3-D FEM analysis of pavement crack at cut to fill location of subgrade

School of Highway, Chang'an University, Xi'an 710064, China

More Information

Author Bio:
Miao Ying-hao(1975-), male, doctoral student, 86-29-82041506, miao_27@sohu.com

摘要

摘要: 为了合理铺设土工格栅, 防止路基填挖交界处路面开裂, 分别建立不加格栅和加入不同层数、不同长度格栅的路基有限元计算模型, 分析了路面顶面的竖向位移和沿路线纵向水平应力应变以及格栅的应力应变。格栅的布设减小了路面顶面竖向位移, 分散了集中在填挖交界处的拉应力和拉应变, 各模型中格栅的最大拉应力均小于1 MPa, 最大拉应变均小于0.3%, 布设一层时的格栅或多层布设时的底层格栅, 拉应力和拉应变从路堑一侧到路堤一侧逐渐减小, 其余层格栅的拉应力和拉应变, 以靠近交界处路堑一侧最大。对计算结果的分析表明, 土工格栅消除或延缓了路面横向裂缝的发生, 布设一层时的格栅或多层布设时的底层格栅, 路堑一侧应长于路堤一侧, 其余层宜以交界处为轴对称布设。
- 道路工程 /
- 路基 /
- 土工格栅 /
- 填挖交界 /
- 路面裂缝 /
- 有限元方法
Abstract: In order to prevent pavement cracking at cut to fill location of subgrade, the treatment mechanism and proper layout of geogrid were studied by 3-D finite element method(FEM), subgrade FEM models with various lengths of geogrid and various number of geogrid layers were built, a model without geogrid was also built for comparison, the vertical displacement, longitudinal stain and stress of pavement surface and geogrid stain and stress were analyzed. Geogrid in subgrade reduces the vertical displacement of pavement surface, scatters the concentrated tensile strain and stress at cut to fill location. The maximum geogrid stress and strain of all models are below 1 MPa and 0.3% respectively. For one layer case and the bottom geogrid for multilayer cases, geogrid stress and strain are decreased gradually from cut to fill side. In the other layers, geogrid stress and strain at cut side near cut to fill location are maximum. It is discovered that geogrid eliminate or postpone the pavement transverse cracking, for one layer case, geogrid should be longer in cut side than in the fill side, the bottom geogrid should be longer in cut side than in fill side, and the others should be laid symmetrically for multilayer cases.
- road engineering /
- subgrade /
- geogrid /
- cut to fill location /
- pavement cracking /
- 3-D FEM

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图 1 典型纵断面

Figure 1. Typical profile

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图 2 计算模型/m

Figure 2. Computation model

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图 3 边坡简化形式/m

Figure 3. Simplified slope form

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图 4 栅布设／cm

Figure 4. Geogrid layout

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图 5 竖向位移分布

Figure 5. Vertical displacement distribution

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图 6 路面纵向应力应变分布

Figure 6. Longitudinal stress and stain of pavement

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图 7 TWJJ1-1格栅纵向应力应变分布

Figure 7. Geogrid longitudinal stress and stain of TWJJ1-1

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图 8 TWJJ1-2格栅纵向应力应变分布

Figure 8. Geogrid longitudinal stress and stain of TWJJ1-2

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图 9 TWJJ1-3格栅纵向应力应变分布

Figure 9. Geogrid longitudinal stress and stain of TWJJ1-3

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图 10 TWJJ1-4格栅纵向应力应变分布

Figure 10. Geogrid longitudinal stress and stain of TWJJ1-4

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图 11 TWJJ1-5格栅纵向应力应变分布

Figure 11. Geogrid longitudinal stress and stain of TWJJ1-5

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图 12 TWJJ1-6格栅纵向应力应变分布

Figure 12. Geogrid longitudinal stress and stain of TWJJ1-6

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表 1 有限元模型

Table 1. FEM models

模型编号	有否格栅	原地面坡度	格栅长度/m	加筋层数	填土高差/m
TWJJ1-1	有	1∶1	20	1	24
TWJJ1-2	有	1∶1	10	2	24
TWJJ1-3	有	1∶1	15	2	24
TWJJ1-4	有	1∶1	20	2	24
TWJJ1-5	有	1∶1	25	2	24
TWJJ1-6	有	1∶1	20	3	24
TWJJ2-1	无	1∶1	—	—	24

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表 2 土的参数

Table 2. Parameters of soil

密度/(g·cm^-3)	弹性模量/MPa	泊松比	粘聚力/kPa	内摩擦角/(°)	膨胀角/(°)
1.924	50	0.35	126.12	30.650	30.650

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表 3 土工格栅参数

Table 3. Parameters of geogrid

筋肋厚度/mm	纵向抗拉强度/(kN·m^-1)	平均弹性模量/MPa	泊松比	土与格栅的摩擦系数
3.0	56.1	400	0	0.57

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表 4 路面结构及材料参数

Table 4. Parameters of pavement structures and materials

结构层(自下而上)	厚度/cm	密度/(g·cm^-3)	弹性模量/MPa	泊松比
石灰稳定土	30	1.600	500	0.35
水泥石灰稳定碎石	18	2.000	1000	0.35
沥青混凝土	4+3	2.500	1500	0.35
计算模型采用值	55	1.845	800	0.35

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