2012年9月上 施工技术 第41卷第372期 CONSTRUCTIONTECHNOLOGY 53 发卡式热棒一隔热层复合路基 在多年冻土区应用研究 樊凯',俞祁浩',袁堃',屈强² (1.中国科学院寒区早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研究院有限公司,陕西西安710075) [摘要】基于已有单一路基调控措施作用效果分析,提出发卡式热棒一隔热层复合路基调控工程措施,对复合调控 措施作用机理、发卡式热棒结构设计、复合调控措施路基结构设计等进行了探讨,介绍了复合调控工程措施实体试 验工程监测方案、施工过程及施工质量控制要点。
观测数据表明,复合路基调控工程措施能使隔热层有较大热阻, 效果明显,起到全年减少路基体吸热的积极作用,有利于保持多年冻土路基稳定。
[关键词]公路工程;路基;试验;发卡式热棒;多年冻土 [中图分类号]TU352.1;U416.1+68 [文献标识码]A [文章编号]1002-8498(2012)17-0053-05 Research onApplication ofHairpin-shaped Thermosyphon and Thermal Insulation CompositeEmbankmentinPermafrostRegions Fan Kai',Yu Qihao',Yuan Kun',Qu Qiang² (1.State Key Laboratory ofFrozen Soil Engineering,Cold andAridRegions Environmentaland Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China; 2.CCCC First Highway Consultants Co.,Ltd.,Xi'an,Shaanxi 710075,China) Abstract;Based on the effectiveness analysisof existing single control measures,a posite control measures with hairpin-shaped thermosyphon and thermal insulation was proposed. The mechanism of .posite control measures, structural design of the hairpin-shaped thermosyphon and the posite test of the posite control engineering measures,the construction process andkey points of construction quality control were introduced. Observation data shows that the insulation layer reduces the heat observed by the embankment in warm season due to its high thermal resistance and the hairpin-shaped thermosyphon can cool the embankment with initiative convection.With proper bination of these two factors, the embankment temperature can be effectively reduced during the whole year, which helps to maintain the stability of permafrost embankment. Key words:road construction; embankment; testing;hairpin-shaped thermosyphon; permafrost 多年冻土是非常复杂的特殊地质体,随着科研有主动降温保护冻土的措施,不同的工程措施适用 的深人和深化,在青藏公路整治改建中,已试验采于不同的冻土地温条件及地质条件,其保护冻土的 用了一系列保护多年冻土路基稳定的工程措施,如效果也有差异(。
这些特殊工程措施对于调控冻 隔热层路基、遮阳板路基、热棒路基、碎石片块石路 土地温,治理路基病害,改善路基结构形式,保持路 基、通风管路基等(),这些工程措施从传热角度分 基稳定起到积极作用,调控措施的...