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为维护多年冻土区宽幅高等级公路的热稳定性及保护下伏冻土,提出了一种L型热管–块碎石护坡保温板复合路基。为研究这种新型路基的降温效果,进行了室内模型试验,试验结果初步证明了这种路基的有效降温能力。为研究这种新型路基的长期效果,采用相关理论,结合室内模型试验的结果,依据青藏高原多年冻土区宽幅高等级公路的气温和地质条件,利用数值方法对有无L型热管的块碎石护坡保温板复合路基的温度特征进行了分析和比较。结果表明:在年平均气温为-4.0℃的青藏高原多年冻土区,考虑未来50 a气温上升2.6℃的条件下,新的复合路基能够从整体上有效降低路基下土体的温度,确保高温多年冻土区宽幅高等级公路路基的热稳定性。
In order to maintain the thermal stability of wide and high-grade highway in permafrost region and to protect the permafrost, a L-type heat pipe-block gravel insulation board composite subgrade is proposed. In order to study the cooling effect of this new roadbed, an indoor model test was carried out. The test results proves the effective cooling capacity of the roadbed. In order to study the long-term effect of this new subgrade, the relevant theory and the results of indoor model test are used to analyze the temperature and geologic conditions of wide and high-grade highway in the permafrost region of Qinghai-Tibet Plateau. The temperature characteristics of composite embankment of gravel slope thermal insulation board were analyzed and compared. The results show that in the permafrost region with an average annual temperature of -4.0 ℃, taking into account the temperature rise of 2.6 ℃ in the next 50 years, the new composite subgrade can effectively reduce the temperature of soil under the subgrade as a whole and ensure the high temperature Thermal Stability of Wide and High Grade Highway Subgrade in Permafrost Regions.