青藏线冻土区"阴阳坡"问题及其辐射机制
The Effect of Embankment Slope Orientation along the Qinghai-Tibet Routes and Related Radiation Mechanism
孙立平 1董献付 1周勇 1赵雄章 1王釭 1陈继2
作者信息
- 1. 青海省地方铁路办公室,青海,西宁,810000
- 2. 中国科学院,寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃,兰州,730000
- 折叠
摘要
青藏线(包括青藏铁路和青藏公路)格-拉段基本呈南北走向, 对其进行的长期地温监测表明, 在多年冻土地区, 两条线路绝大部分路段的路基出现了所谓的 "阴阳坡"现象. 在多年冻土地区, 尤其是高含冰量的多年冻土区, 阴阳坡的出现给路基的稳定性带来了极大的危害. 在分析青藏线沿线太阳辐射特点的基础上指出, 青藏高原上强烈的太阳辐射, 再加上边坡坡向以及太阳总辐射特殊的日变化规律导致了青藏线上的"阴阳坡"现象. 对于如何消除阴阳坡问题, 减缓其危害性, 给出了两条建议: 1)在路基边坡或者路面喷涂热反射材料;2)适当降低路基高度并减小路基边坡的坡度.
Abstract
The Qinghai-Tibet routes ( including highway and railway) mainly extend from north to south. Long-term ground temperature observation shows that the temperature under the east-face slope is higher than that under the west-face slope. This is an effect of embankment slope. For the Qinghai-Tibetan routes located in permafrost regions , especially the regions with high ice content, effect of embankment slope orientation causes huge damages to the embankment. This paper focuses on the reasons of the effect of embankment slope orientation developing from the point of view of solar radiation. It is demonstrated that intensive solar radiation, difference of slope orientation and the particular diurnal variety of solar radiation lead to the effect of embankment slope orientation. Finally, some suggestions are proposed to eliminate the effect of embankment slope orientation: 1) to spray or paint material with high albedo on the slopes or the road surface; 2) to reduce the thickness of the embankment and decrease the slope gradient of the embankment appropriately.
关键词
阴阳坡/太阳辐射/青藏线Key words
slope orientation/solar radiation/Qinghai-Tibet routes引用本文复制引用
基金项目
青海省地方铁路科学研究基金(CHM-2007-01)
出版年
2008
NETL
NSTL
万方数据