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太阳辐射是导致气温和地表温度升高的主要因素之一,遮挡了太阳直接辐射后可以有效降低地表温度.基于青藏铁路冻土区遮阳棚路基试验工程监测数据,分析了遮阳棚内外的气温差异和路基地温特征.结果表明:遮阳棚能够降低棚内气温,监测期间棚内年平均气温低于天然条件下平均气温值0.6℃;监测期内天然条件下近地表0.1～0.3m范围的气温高于1.0m以上气温近1℃,但在棚体内部仅相差约0.3℃;日最高气温值在棚体内外的单日差值达6.0℃,平均气温值在地面0.1m高度处相差4.2℃,1.5m高度处相差2.1℃;在遮阳棚的作用下,棚体内部及附近土体地温有所降低,且多年冻土上限有一定的抬升,抬升最大幅度达1.0m.监测结果显示了遮阳棚对于保护路基下冻土的良好效果.
Solar radiation is one of the main factors leading to the rise of temperature and surface temperature, which can effectively reduce the surface temperature after the direct solar radiation is obstructed.Based on the monitoring data of the project of sunshade subgrade test in the permafrost region of Qinghai-Tibet Railway, the difference of air temperature inside and outside the sunshade And the ground temperature characteristics of the roadbed.The results showed that: the awning can reduce the temperature in the shed, the annual mean temperature in the shed during the monitoring period is lower than the average temperature of 0.6 ℃ under natural conditions; during the monitoring period, the temperature in the range of 0.1 ~ 0.3m The air temperature above 1.0m was nearly 1 ℃, but only about 0.3 ℃ in the interior of the greenhouse. The daily maximum air temperature was 6.0 ℃ inside and outside the greenhouse, and the average air temperature was 4.2 ℃ above 0.1m above the ground , And the difference of 1.5m height is 2.1 ℃. Under the action of sunshade, the ground temperature of the soil in and around the shed decreases, and the upper limit of permafrost rises to a maximum of 1.0m. The monitoring results show that the sunshade Shed for the protection of subgrade soil under the good effect.