多年冻土区宽幅公路路基降温效果研究——一种L型热管-块碎石护坡复合路基  

Cooling effect of combined L-shaped thermosyphon,crushed-rock revetment and insulation for high-grade highways in permafrost regions

作　　者：董元宏[1,2] 赖远明[1] 陈武[1] 

机构地区：[1]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 [2]中交第一公路勘察设计院有限公司,陕西西安710065

出　　处：《岩土工程学报》2012年第6期1043-1049,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(40730736;41101068);中交寒区道路实验室开放基金资助项目;中央高校基本科研业务专项基金项目(CHD2009JV172);交通运输部应用基础研究重点项目

摘　　要：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 keep the thermal stability of large-width highway embankment in permafrost regions, a new type of cooling measure of combined L-shaped thermosyphon, crushed-rock revetment and insulation is presented. To examine its cooling effect, laboratory tests are carried out. The test results have preliminarily proved the effectiveness of the new cooling measure. To further validate its effectiveness in the service life of the highways in permafrost regions, based on relative theories and the laboratory test results, a numerical model for the highway embankment is established, and the temperature characteristics of the embankment in its service life are analyzed. The numerical results show that the combination of the L-shaped thermosyphon, crushed-rock revetment and insulation is effective to keep the thermal stability of the large-width embankment in its service life under the condition that the air temperature is warmed up by 2.6℃. Based on this, the new combined cooling measure is suggested to be used in the construction of large-width embankment in permafrost regions.

关 键 词：高等级公路 L型热管 块碎石护坡 降温效果 

分 类 号：TU43[建筑科学—岩土工程]