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青藏公路热棒制冷工程(Heat Pipe Subgrade in Permafrost Regions)
来源:西安中交公路岩土工程有限责任公司   发布时间:2013/7/1   浏览次数:


  青藏公路穿越数百公里的多年冻土地区。周而复始的冻融循环所导致基底的不均匀变形及其带来的路面、桥涵等构造物的破坏,多年来一直是青藏公路建设和管养过程中最大的技术难题。

  公司技术人员在进行路基科研试验和施工中,除采用通风路基、碎石边坡、遮阳板等先进技术手段外,还在高温、高含冰量路段采用了无动力热棒制冷技术,即利用封闭管体中液态与气态转换散热原理将冻土地层中的热量传输至大气中,降低多年冻土温度,防止多年冻土上限下移,有效改善了多年冻土路段地基土体的力学特征。青藏公路楚玛尔河高平原K2937+100~K2939+160、K2947+500~K2951+100两段路基沉降变形和纵向裂缝十分严重,采用热棒制冷技术处治后已使用三年,效果良好。大规模采用热棒制冷技术解决多年冻土地区路基稳定问题,在我国尚属首例,并为青藏公路建设所采用。

  Qinghai-tibet highway runs through the permafrost area of several hundred kilometers. The ununiformity deformation of subgrade bottom caused by repeated frost-and-thaw cycle and the breakage to the structures such as road surface, bridge and culvert have been  all along the most difficult technology problem for many years.
In scientific research test and construction, in addition to using advanced technology means such as ventilation subgrade, macadam side slope, sunshading board, the professionals of the company adopt
the no-power hot stick cooling technology in the road section with high temperature and high ice content, namely: transforming the heat in frost soil layer to the atmosphere in light of the cooling theory of liquid-and-gas conversion in closed pipe so as to decrease permafrost temperature and to prevent the upper limit of permafrost from moving downward, this technology effectively improves the mechanics feature of subgrade soil in permafrost road section. The subgrade of K2937+100~K2939+160 and K2947+500~K2951+100 sections of Chuermahe high plain in Qing Zang highway had serious settlement deformation and longitudinal crack, after treatment by hot stick cooling technology three years ago, it is still in good condition. This is the first example of using hot stick cooling technology on a large scale to solve the subgrade stability problem in permafrost area, and it was adopted in construction of Qing Zang highway.

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