| 青藏高原机场跑道多年冻土地基温度场特征 |
| |
| 引用本文： | 戚春香,李瑶,杨简,张献民,程国勇.青藏高原机场跑道多年冻土地基温度场特征[J].交通运输工程学报,2019,19(1):33-47. |
| |
| 作者姓名： | 戚春香 李瑶 杨简 张献民 程国勇 |
| |
| 作者单位： | 中国民航大学 机场学院,天津,300300;中国民航科学技术研究院,北京,100028 |
| |
| 基金项目： | 中央高校基本科研业务费专项资金项目3122017037中央高校基本科研业务费专项资金项目3122016C007中央高校基本科研业务费专项资金项目3122016A005国家自然科学基金项目51178456 |
| |
| 摘 要： | 对比了青藏高原多年冻土地区机场跑道地基温度场与公路路基温度场, 分析了其地基温度分布、温度沿深度的变化以及地基最大融化深度, 研究了宽幅沥青混凝土道面机场跑道地基温度场特征, 对比了不同道面宽度条件下其地基温度分布、不同时间地基温度沿深度的变化以及跑道中部及道肩的最大融化深度, 并基于道面宽度、时间建立了沥青混凝土道面机场跑道道中地基融化深度的表达式。研究结果表明: 多年冻土地区机场跑道地基温度场与公路路基温度场存在明显差异, 机场跑道地基融土核位置更低, 且全部位于天然地面以下, 而公路路基融土核位置相对较高, 可以通过抬高路堤使融土核全部位于路堤内, 便于通风管等温控措施的施工, 可见由于机场跑道无路堤、道面幅度宽等特点, 使得多年冻土地区公路与铁路建设的现有研究成果不能完全应用于机场跑道建设中; 对于沥青混凝土道面的机场跑道多年冻土地基, 随着道面宽度的增加, 跑道地基稳定性降低, 道面宽度每增加1%, 地基0℃等温线约下降0.17%, 地基融土核最高温约上升0.46%, 道中地基融化深度约加深0.19%, 但当道面宽度超过35 m时, 道中地基融化深度趋于平稳; 相对于道中地基温度场, 道肩受道面宽度的影响较小, 当道面宽度超过25 m时, 其地基融化深度趋于平稳; 道中地基融化深度表达式相关系数为0.988 6, 相对误差在1%以内。
|
| 关 键 词： | 道路与铁道工程 公路路基温度场 跑道地基温度场 多年冻土 道面宽度 有限元模拟 |
| 收稿时间： | 2018-08-19 |
Characteristics of temperature field of airfield runway permafrost subgrade in Qinghai-Tibetan Plateau |
| |
| QI Chun-xiang,LI Yao,YANG Jian,ZHANG Xian-min,CHENG Guo-yong.Characteristics of temperature field of airfield runway permafrost subgrade in Qinghai-Tibetan Plateau[J].Journal of Traffic and Transportation Engineering,2019,19(1):33-47. |
| |
| Authors: | QI Chun-xiang LI Yao YANG Jian ZHANG Xian-min CHENG Guo-yong |
| |
| Affiliation: | 1.School of Airfield Engineering, Civil Aviation University of China, Tianjin 300300, China2.China Academy of Civil Aviation Science and Technology, Beijing 100028, China |
| |
| Abstract: | The temperature fields of airfield runway subgrade and road subgrade in the permafrost region of Qinghai-Tibetan Plateau were compared. The subgrade temperature distributions, the temperature variations along depth, as well as the maximum melting depths of subgrades were analyzed. The subgrade temperature field characteristics of wide airfield runway of asphalt concrete pavement were studied. The subgrade temperature distributions, the subgrade temperature variations along depth at different times and the maximum melting depths of middle and shoulder of runway under different pavement width conditions were compared. The expression of subgrade melting depth of airfield runway of asphalt concrete pavement was obtained based on the pavement width and time. Analysis result indicates that there are obvious differences between the temperature fields of airfield runway subgrade and road subgrade in the permafrost region. The subgrade melt nuclear of airfield runway is lower in position, and it is all below the natural ground, as well as the subgrade melt nuclear of road is higher in position. The melt nuclears are all located in the embankment by raising the embankment, which facilitates the construction of temperature control measures like ventilation duct. It shows that because airfield runway has the characteristics like no embankment and wider pavement, the existing research results of road and railway construction in the permafrost region can not be fully applied to airfield runway construction. For the airfield runway permafrost subgrade of asphalt concrete pavement, as the width of pavement increases, the subgrade stability decreases. When the pavement width increases by 1%, the subgrade isotherm of 0 ℃ decreases by 0.17%, the highest temperature of subgrade melt nuclear increases by about 0.46%, and the subgrade melting depth of middle of runway increases by about 0.19%. But when the width of pavement exceeds 35 m, the subgrade melting depth of middle of runway tends to be stable. Compared with the temperature field of middle of runway subgrade, the shoulder is less affected by pavement width, when the width of pavement exceeds 25 m, its subgrade melting depth tends to be stable. The correlation coefficient of expression of subgrade melting depth of middle of runway is 0.988 6, and the relative error is less than 1%. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《交通运输工程学报》浏览原始摘要信息 |
|
点击此处可从《交通运输工程学报》下载全文 |
|
