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为解决在高温、高含冰量冻土地段修筑铁路工程后的路基稳定性技术难题,在路基工程的设计中采用主动保护多年冻土的措施——片石气冷护坡,通过调控路基下地温场以阻止或减少由于多年冻土地基融化下沉而引起的路基变形。在青藏铁路清水河高温冻土细粒土段进行片石气冷护坡路堤和普通路堤实体工程对比试验,基于3个测试断面、2个冻融循环的地温和变形监测资料,对比分析片石气冷护坡措施路堤与普通路堤体内和基底的地温、积温、温度场中最大融化深度的变化情况及路堤的变形特征。分析结果表明,采用片石气冷护坡措施的路堤,与普通路堤相比,降温效果明显,负积温量值大,最大融化深度抬升幅度也较大,沉降量小。因此,片石气冷护坡能够有效发挥降低地温、保护多年冻土的作用,是一种施作方便、适用条件较广泛的主动保护多年冻土措施。
In order to solve the technical problem of roadbed stability after the construction of railway projects in high temperature and high ice content frozen terrain, the measure of active protection of permafrost is adopted in the design of roadbed engineering - the flaky gas cooling slope protection, by controlling the ground temperature field under the subgrade to prevent Or to reduce subgrade deformation caused by thawing and thawing of permafrost foundations. In Qinghai-Tibet Railway Qingshuijiang fine frozen soil fine-grained lithoslope slope embankment and ordinary embankment solid engineering comparison test, based on three test sections, two freeze-thaw cycles of geothermal deformation monitoring data, comparative analysis of flake gas cooling slope Measures of embankment and ordinary embankment body and the basement of the ground temperature, accumulated temperature, temperature field maximum melting depth changes and embankment deformation characteristics. The analysis shows that the embankment adopting gas-cooled slope protection measures has obvious cooling effect compared with ordinary embankments, with large negative temperature and large maximum melting depth, and small settlement. Therefore, the tablet-gas-cooled slope protection can effectively play the role of reducing the ground temperature and protecting the permafrost. It is a kind of active protection permafrost measures that are convenient for application and applicable to a wide range of conditions.