| 李雪连*,陈宇亮,张起森,熊英杰.现场实测结构温度对半刚性沥青路面性能的影响[J].实验力学,2014,29(4):453~459 |
| 现场实测结构温度对半刚性沥青路面性能的影响 |
| Effect of On-site Measured Structure Temperature on Performance of Semi-rigid Asphalt Pavement |
| 投稿时间：2014-01-25 修订日期：2014-03-24 |
| DOI：10.7520/1001-4888-14-017 |
| 中文关键词: 沥青路面 温度 有限元 半刚性基层 车辙 |
| 英文关键词:asphalt pavement temperature finite element method (FEM) semi-rigid base rutting |
| 基金项目:国家自然科学基金(51308075);江西省交通运输厅科技项目(2012C0006);道路结构与材料交通行业重点实验室(长沙理工大学)开放基金资助项目(kfj130201,kfj100203); 海南省交通科技项目(JT20130898006) |
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| 中文摘要: |
| 针对中国特色的半刚性基层沥青路面,在广韶高速公路瓮城段进行为期一个月高温期的现场温度观测。运用三维有限元方法,结合现场实测温度,分析了半刚性沥青路面结构的最大拉应力、最大剪应力和最大路表弯沉在荷载和荷载耦合作用下的变化情况。结果表明,随着路面深度增加,温度波动的幅度逐渐减小;路面内的最高温度相对大气和路表温度滞后约1小时;沥青路面内部温度高于表面温度;大气、路表和路面内部温度变化基本同步,温度波峰与波谷的出现频率相同;在温度和荷载综合作用下,路表以下2cm深度范围内易出现因拉应力不足造成的开裂破坏;路表以下10cm深度范围内,较易出现剪切破坏;高温温度场的存在虽不会明显增大路面结构各层的拉应力与剪应力,但会明显增大路表弯沉,故易产生车辙破坏。 |
| 英文摘要: |
| Nowadays it is a fact that semi-rigid asphalt pavement is applied frequently and widely in highway, especially expressway construction in China. However, early distresses due to this kind of pavement remain a challenge to pavement engineers in recent years. A one-month on-situ temperature observation and inspection were conducted in summer high temperature weather at Jing-Zhu expressway Wencheng section. Combining on-situ measured temperature data, adopting 3D finite element method (FEM), distribution and variation of the maximum tensile stress, the maximum shear stress and the maximum road surface deflection due to load and horizontal and vertical load coupling action of semi-rigid asphalt pavement structure were analyzed. Results show that the amplitude of temperature fluctuation decreases with pavement depth increase. The internal temperature is higher than that of asphalt pavement surface. The maximum temperature within pavement lags behind the surface and atmospheric temperature about one hour. All the atmosphere temperature, the road surface temperature and the internal temperature fluctuate basically in synchronization. The temperature peak and valley appear at the same frequency. FEM analysis reveals that within the range below road surface 2cm depth, asphalt is prone to crack damage due to lack of tensile stress. The shear stress in 10cm-deepth is greater than other part. Tensile stress and shear stress of pavement changes little due to high temperature, but it results in obvious increase of road surface deflection. It is easy to produce rutting damage. |
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