中文摘要：

冻土区路基各表面间太阳辐射的差异引起路基发生横向非均匀变形。目前所采用的基于太阳入射角的分析方法,未能充分考虑到冻土区高路基遮阳效应对周边冻土的影响,特别是在对路基坡脚附近冻土分析时与实际工况存在很大的偏差。基于太阳辐射强度和路基影子轨迹随时间的变化规律,提出利用遮阳理论分析路基表面太阳辐射的分析方法。通过对比K.Y.Kondratyev关于倾斜面接收太阳辐射的描述和工程实测数据,验证遮阳理论分析方法的正确性。基于遮阳理论提出直射率概念,并获得路基表面温度计算的经验方程。分析表明,冻土区路基各表面的太阳辐射之间存在明显的差异,其差异性与路基走向、坡度等影响因素密切相关。对于坡度较大的高路基,路基的遮阳效应也会引起路基周边冻土表面出现明显的非均匀太阳辐射,表现为越靠近路基坡脚辐射量越小,阴坡坡脚处辐射量小于阳坡坡脚处辐射量,这种太阳辐射的非均匀分布在路基的稳定性分析中应予以考虑。

英文摘要：

The difference of solar radiation on different surfaces of embankment would cause uneven transverse deformation. The calculation method based on solar incident angles without considering the shielding to sunshine of high embankment in permafrost regions produces results that have large deviation from the actual situation especially for the permafrost near the toe of slope. A mathematical model of sunshine shield considering the time, the intensity of solar radiation,the position of sun and the track of embankment shadow was established. The mathematical model of embankment sunshine shield was verified with the results from the calculation method of K.Y. Kondratyev and the field test data. The concept of the rate of direct radiation and an empirical equation of surface temperature were proposed based on the shading theory. The results showed that there were differences in solar radiation on different surfaces of embankment. The direction and slope angle of embankment were found to be the major factors of influence. The solar radiation on permafrost surfaces around the embankment were found to be affected greatly,especially when the embankment is higher and the slope angle is larger. The closer to the toe of embankment slope,the weaker radiation it received. The solar radiation on permafrost in shaded slope side is weaker than sunny slope side. The difference of solar radiation on permafrost surfaces around the embankment should be considered in the stability estimation of embankment.